/**
 * ============================================
 * MEDICAL SIMULATION PLATFORM - DESIGN SYSTEM
 * ============================================
 * 
 * World-class cognitive training instrument.
 * Apple polish, Linear interactions, Stripe confidence.
 * 
 * ============================================
 */

@import url('tokens.css');
@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Sans+Arabic:wght@400;500;600;700&display=swap');

/* ===================================================================
   BILINGUAL & RTL ARCHITECTURE (EN ⇄ AR)
   =================================================================== */

/* Language Switch Button (Frameless Ghost Control) */
.lang-switch-btn,
.btn-lang-toggle,
.lang-toggle-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    height: 34px;
    padding: 0 10px;
    border-radius: var(--radius-md, 6px);
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-family: inherit;
    font-size: 13.5px;
    font-weight: 500;
    cursor: pointer;
    transition: color 0.15s ease, background-color 0.15s ease;
    user-select: none;
    text-decoration: none;
}

.lang-switch-btn:hover,
.btn-lang-toggle:hover,
.lang-toggle-btn:hover {
    background: var(--bg-overlay, rgba(255, 255, 255, 0.06));
    color: var(--text-primary);
    border: none;
    transform: none;
}

.lang-switch-btn:active,
.btn-lang-toggle:active,
.lang-toggle-btn:active {
    transform: none;
}

.lang-switch-dest {
    font-weight: 500;
    letter-spacing: 0.01em;
}

/* RTL Layout Primitives */
[dir="rtl"] {
    text-align: start;
}

[dir="rtl"] .header-inner {
    direction: rtl;
}

[dir="rtl"] .header-actions {
    flex-direction: row;
}

/* Directional Icons Mirroring */
[dir="rtl"] .icon-directional,
[dir="rtl"] .breadcrumb-sep,
[dir="rtl"] .nav-arrow,
[dir="rtl"] .pagination-arrow-prev,
[dir="rtl"] .pagination-arrow-next,
[dir="rtl"] .chevron-next,
[dir="rtl"] .chevron-prev,
[dir="rtl"] .exit-btn svg {
    transform: scaleX(-1);
}

/* Non-directional Icons must NEVER mirror */
[dir="rtl"] .icon-search,
[dir="rtl"] .icon-settings,
[dir="rtl"] .icon-medical,
[dir="rtl"] .icon-sun,
[dir="rtl"] .icon-moon,
[dir="rtl"] .logo-mark svg {
    transform: none !important;
}

/* Bidirectional Text & Medical Isolate */
bdi,
.bidi-isolate,
.medical-unit,
.medical-val,
.telemetry-val,
.dose-val {
    unicode-bidi: isolate;
    direction: ltr;
    display: inline-block;
}

[dir="rtl"] .score-pct,
[dir="rtl"] .vital-value {
    direction: ltr;
    display: inline-block;
}

/* BiDi Plaintext Isolation for Clinical & Choice Content (Protects English Fallbacks in RTL) */
[dir="rtl"] .choice-item,
[dir="rtl"] .choice-text,
[dir="rtl"] .choice-label-text,
[dir="rtl"] .dx-choice-item,
[dir="rtl"] .dx-choice-text,
[dir="rtl"] .emergency-choice,
[dir="rtl"] .usmle-choice-card,
[dir="rtl"] .usmle-choice-text,
[dir="rtl"] .clinical-narrative,
[dir="rtl"] .lead-in-text,
[dir="rtl"] .patient-history,
[dir="rtl"] .case-description,
[dir="rtl"] .stage-vignette-card {
    unicode-bidi: plaintext;
    text-align: start;
}


[dir="rtl"] input,
[dir="rtl"] textarea,
[dir="rtl"] select {
    text-align: right;
}

[dir="rtl"] .leaderboard-score {
    text-align: left;
}

[dir="rtl"] .leaderboard-table-header,
[dir="rtl"] .leaderboard-row {
    direction: rtl;
}

[dir="rtl"] .hero-status,
[dir="rtl"] .community-action,
[dir="rtl"] .panel {
    text-align: right;
}

[dir="rtl"] .stat-value {
    direction: ltr;
    unicode-bidi: isolate;
}

/* ========== MODE BANNER + PILLS ========== */
.mode-banner {
    position: fixed;
    top: 60px;
    right: 12px;
    padding: 6px 10px;
    border-radius: 10px;
    color: #fff;
    font-weight: 700;
    font-size: 12px;
    z-index: 1100;
    box-shadow: 0 6px 18px rgba(0,0,0,0.18);
}
.mode-banner.practice { background: var(--mode-practice-accent); }
.mode-banner.lab { background: var(--mode-lab-accent); }
.mode-banner.emergency { background: var(--mode-emergency-accent); }
.mode-banner.surgery { background: var(--mode-surgery-accent); }
.mode-banner.story { background: var(--mode-story-accent); }
.mode-banner.rpg { background: var(--mode-rpg-accent); }
.mode-banner.multiplayer { background: #14B8A6; }
.mode-banner.forensic { background: var(--mode-forensic-accent, #64748B); }

.mode-pills { display: flex; gap: 8px; flex-wrap: wrap; }
.mode-pill {
    padding: 6px 10px;
    border-radius: 9999px;
    background: var(--bg-elevated);
    color: var(--text-secondary);
    border: 1px solid var(--border-default);
    cursor: pointer;
    font-size: 13px;
}
.mode-pill.active {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

/* ============================================
   RESET & BASE
   ============================================ */

*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    font-size: 16px;
    height: 100%;
    overscroll-behavior: none;
}

body {
    font-family: var(--font-sans);
    font-size: var(--text-base);
    line-height: var(--leading-normal);
    background: var(--bg-base);
    color: var(--text-primary);
    min-height: 100%;
    overflow-x: hidden;
    overscroll-behavior: none;
    padding-top: var(--safe-area-top, env(safe-area-inset-top, 0px));
    padding-bottom: var(--safe-area-bottom, env(safe-area-inset-bottom, 0px));
    padding-left: var(--safe-area-left, env(safe-area-inset-left, 0px));
    padding-right: var(--safe-area-right, env(safe-area-inset-right, 0px));
    /* Capacitor Native Optimization */
    -webkit-touch-callout: default;
    -webkit-tap-highlight-color: transparent;
}

body.keyboard-open {
    height: auto;
}

/* Re-enable selection for inputs and textareas */
input, textarea, [contenteditable] {
    -webkit-user-select: auto;
    user-select: auto;
}

/* Ambient gradient removed - clinical interface is a monitor, not a light source */
body::before {
    display: none;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--duration-fast) var(--ease-out);
}

img,
svg,
video {
    max-width: 100%;
    display: block;
}

button,
input,
textarea,
select {
    font: inherit;
    color: inherit;
    background: none;
    border: none;
}

button {
    cursor: pointer;
}

ul,
ol {
    list-style: none;
}

/* ============================================
   TYPOGRAPHY
   ============================================ */

.display {
    font-size: var(--text-5xl);
    font-weight: var(--weight-bold);
    letter-spacing: var(--tracking-tight);
    line-height: var(--leading-tight);
}

.h1 {
    font-size: var(--text-4xl);
    font-weight: var(--weight-semibold);
    letter-spacing: var(--tracking-tight);
    line-height: var(--leading-tight);
}

.h2 {
    font-size: var(--text-2xl);
    font-weight: var(--weight-semibold);
    line-height: var(--leading-snug);
}

.h3 {
    font-size: var(--text-xl);
    font-weight: var(--weight-semibold);
    line-height: var(--leading-snug);
}

.h4 {
    font-size: var(--text-lg);
    font-weight: var(--weight-semibold);
    line-height: var(--leading-snug);
}

.body-lg {
    font-size: var(--text-lg);
    line-height: var(--leading-relaxed);
}

.body {
    font-size: var(--text-base);
    line-height: var(--leading-normal);
}

.body-sm {
    font-size: var(--text-sm);
    line-height: var(--leading-normal);
}

.caption {
    font-size: var(--text-xs);
    font-weight: var(--weight-semibold);
    letter-spacing: var(--tracking-wider);
    text-transform: uppercase;
    color: var(--text-tertiary);
}

.mono {
    font-family: var(--font-mono);
}

.text-secondary {
    color: var(--text-secondary);
}

.text-tertiary {
    color: var(--text-tertiary);
}

.text-accent {
    color: var(--accent);
}

.text-success {
    color: var(--success);
}

.text-warning {
    color: var(--warning);
}

.text-danger {
    color: var(--danger);
}

/* ============================================
   LAYOUT
   ============================================ */

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-4);
}

.container-sm {
    max-width: 640px;
}

.container-md {
    max-width: 768px;
}

.container-lg {
    max-width: 1024px;
}

.container-xl {
    max-width: 1280px;
}

/* ============================================
   MAIN CONTENT CONTAINER
   ============================================ */

.main {
    width: 100%;
    max-width: 1240px;
    margin: 0 auto;
    padding-top: calc(60px + 36px);
    padding-bottom: 96px;
    padding-left: var(--space-6);
    padding-right: var(--space-6);
    min-height: 100vh;
    box-sizing: border-box;
    position: relative;
}

/* ============================================
   HEADER
   ============================================ */

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    padding-top: env(safe-area-inset-top, 0px);
    height: calc(60px + env(safe-area-inset-top, 0px));
    box-sizing: border-box;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-default);
    transition: background var(--duration-fast) var(--ease-out), border-color var(--duration-fast) var(--ease-out);
}

[data-theme="dark"] .header {
    background: rgba(10, 10, 15, 0.85);
    border-bottom: 1px solid rgba(255, 255, 255, 0.07);
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.92);
    border-bottom: 1px solid var(--border-default);
}

[data-theme="dark"] .header.scrolled {
    background: rgba(10, 10, 15, 0.92);
    border-bottom: 1px solid rgba(255, 255, 255, 0.09);
}

.header-inner {
    height: 100%;
    max-width: 1240px;
    margin: 0 auto;
    padding: 0 var(--space-5);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 0;
    border-radius: 0;
    background: transparent;
    border: none;
    box-shadow: none;
    font-size: clamp(1.08rem, 1rem + 0.2vw, 1.22rem);
    font-weight: 560;
    letter-spacing: -0.03em;
    line-height: 1.05;
    color: var(--text-primary);
    transition: transform var(--duration-fast) var(--ease-out),
        opacity var(--duration-fast) var(--ease-out);
}

.logo:hover {
    color: var(--text-primary);
    
    opacity: 0.96;
}

.logo:hover .logo-mark {
    transform: scale(1.03);
}

.logo-mark {
    width: 34px;
    height: 34px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    flex-shrink: 0;
    border-radius: 0;
    overflow: visible;
    isolation: isolate;
    background: transparent;
    border: none;
    box-shadow: none;
    will-change: transform;
    transition: transform var(--duration-base) var(--ease-out),
        opacity var(--duration-fast) var(--ease-out);
}

.logo-mark::before {
    content: '';
    position: absolute;
    right: 0;
    top: 50%;
    width: 5px;
    height: 5px;
    border-radius: var(--radius-full);
    background: #007AFF;
    transform: translateY(-50%) scale(0);
    opacity: 0;
    
    pointer-events: none;
    z-index: 2;
    animation: logoDotIn 0.28s ease 0.98s forwards;
}

[data-theme="light"] .logo-mark::before {
    
}

.logo:hover .logo-mark::before {
    
}

.logo-mark::after {
    content: '';
    position: absolute;
    right: -5px;
    top: 50%;
    width: 14px;
    height: 14px;
    border-radius: var(--radius-full);
    border: 1.5px solid rgba(0, 122, 255, 0.26);
    transform: translateY(-50%) scale(0.35);
    opacity: 0;
    pointer-events: none;
    z-index: 1;
    animation: logoRingOut 1.8s ease-out 1.12s infinite;
}

[data-theme="light"] .logo-mark::after {
    border-color: rgba(0, 122, 255, 0.18);
}

.logo:hover .logo-mark::after {
    animation-duration: 1.1s;
}

.logo-mark svg {
    display: block;
    width: 32px;
    height: 32px;
    overflow: visible;
    position: relative;
    z-index: 1;
}

.logo-mark .ecg-line {
    fill: none;
    stroke: #007AFF;
    stroke-width: 2.4;
    stroke-linecap: round;
    stroke-linejoin: round;
    stroke-dasharray: 115;
    stroke-dashoffset: 115;
    opacity: 0.94;
    filter: drop-shadow(0 0 4px rgba(0, 122, 255, 0.26));
    animation: logoEcgDraw 0.95s cubic-bezier(0.4, 0, 0.2, 1) 0.12s both,
        logoEcgGlow 1.9s ease-in-out 1.12s infinite;
}

[data-theme="light"] .logo-mark .ecg-line {
    filter: drop-shadow(0 0 3px rgba(0, 122, 255, 0.18));
}

.logo:hover .logo-mark .ecg-line {
    opacity: 1;
    filter: drop-shadow(0 0 5px rgba(0, 122, 255, 0.32));
}

@keyframes logoEcgDraw {
    from {
        stroke-dashoffset: 115;
    }

    to {
        stroke-dashoffset: 0;
    }
}

@keyframes logoEcgGlow {
    0%,
    100% {
        opacity: 0.88;
    }

    50% {
        opacity: 1;
    }
}

@keyframes logoDotIn {
    0% {
        opacity: 0;
        transform: translateY(-50%) scale(0);
    }

    65% {
        opacity: 1;
        transform: translateY(-50%) scale(1.24);
    }

    100% {
        opacity: 1;
        transform: translateY(-50%) scale(1);
    }
}

@keyframes logoRingOut {
    0% {
        opacity: 0;
        transform: translateY(-50%) scale(0.35);
    }

    12% {
        opacity: 0.6;
    }

    70% {
        opacity: 0.18;
    }

    100% {
        opacity: 0;
        transform: translateY(-50%) scale(1.65);
    }
}

@media (prefers-reduced-motion: reduce) {
    .logo-mark .ecg-line {
        animation: none;
        stroke-dashoffset: 0;
    }

    .logo-mark::before {
        animation: none;
        opacity: 1;
        transform: translateY(-50%) scale(1);
    }

    .logo-mark::after {
        animation: none;
        opacity: 0;
    }
}

@media (max-width: 768px) {
    .logo {
        gap: 10px;
        font-size: 1.05rem;
    }

    .logo-mark {
        width: 32px;
        height: 32px;
    }

    .logo-mark svg {
        width: 30px;
        height: 30px;
    }
}

/* Navigation */
.nav {
    display: flex;
    align-items: center;
    gap: 4px;
    background: transparent;
    padding: 0;
    border-radius: 0;
    border: none;
    box-shadow: none;
}

.nav-link {
    padding: 6px 12px;
    font-size: 13.5px;
    font-weight: 500;
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    text-decoration: none;
    background: transparent;
    box-shadow: none;
    border: none;
    transition: color 0.15s ease, background-color 0.15s ease;
    white-space: nowrap;
}

.nav-link:hover {
    color: var(--text-primary);
    background: var(--bg-overlay);
    box-shadow: none;
}

.nav-link.active {
    color: var(--text-primary);
    background: var(--bg-elevated);
    font-weight: 600;
    box-shadow: none;
}

/* Header Actions */
.header-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}

.header-actions .lang-switch-btn,
.header-actions .btn-lang-toggle,
.header-actions .lang-toggle-btn {
    background: transparent;
    border: none;
    box-shadow: none;
    color: var(--text-secondary);
    font-size: 13.5px;
    font-weight: 500;
    padding: 0 10px;
    height: 34px;
    border-radius: var(--radius-md, 6px);
    transition: color 0.15s ease, background-color 0.15s ease;
}

.header-actions .lang-switch-btn:hover,
.header-actions .btn-lang-toggle:hover,
.header-actions .lang-toggle-btn:hover {
    background: var(--bg-overlay, rgba(255, 255, 255, 0.06));
    color: var(--text-primary);
    border: none;
    transform: none;
}

/* Theme Toggle & Icon Buttons (Frameless Ghost Controls) */
.theme-toggle,
.icon-btn {
    width: 34px;
    height: 34px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    background: transparent;
    border: none;
    border-radius: var(--radius-md, 6px);
    cursor: pointer;
    padding: 0;
    box-shadow: none;
    transition: color 0.15s ease, background-color 0.15s ease;
    flex-shrink: 0;
}

.theme-toggle:hover,
.icon-btn:hover {
    color: var(--text-primary);
    border: none;
    background: var(--bg-overlay, rgba(255, 255, 255, 0.06));
    box-shadow: none;
    transform: none;
}

.theme-toggle svg,
.icon-btn svg {
    width: 18px;
    height: 18px;
}

.header-actions .btn-ghost {
    background: transparent;
    border: none;
    box-shadow: none;
    color: var(--text-secondary);
    font-size: 13.5px;
    font-weight: 500;
    padding: 0 10px;
    height: 34px;
    border-radius: var(--radius-md, 6px);
    text-decoration: none !important;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: color 0.15s ease, background-color 0.15s ease;
}

.header-actions .btn-ghost:hover {
    background: var(--bg-overlay, rgba(255, 255, 255, 0.06));
    color: var(--text-primary);
    text-decoration: none !important;
}

/* Avatar */
.avatar {
    width: 34px;
    height: 34px;
    background: linear-gradient(135deg, #0284c7, #8b5cf6);
    border-radius: var(--radius-full);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: #ffffff;
    font-size: 13px;
    font-weight: 700;
    cursor: pointer;
    text-decoration: none;
    border: none;
    box-shadow: none;
    transition: opacity 0.15s ease;
    flex-shrink: 0;
}

.avatar:hover {
    opacity: 0.9;
    transform: none;
    box-shadow: none;
}

/* Declarative Auth Shell States — Synchronous pre-paint visibility control */
html.is-authenticated #loginBtn,
html.is-authenticated .auth-guest-only {
    display: none !important;
}

html.is-unauthenticated #userAvatar,
html.is-unauthenticated #navAvatar,
html.is-unauthenticated .auth-user-only {
    display: none !important;
}

html.is-authenticated #userAvatar,
html.is-authenticated #navAvatar,
html.is-authenticated .auth-user-only {
    display: inline-flex !important;
}

/* ============================================
   BUTTONS
   ============================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: 0.75rem 1.5rem;
    font-size: var(--text-base);
    font-weight: var(--weight-semibold);
    border-radius: var(--radius-sm);
    transition: all var(--duration-base) var(--ease-out);
    white-space: nowrap;
    min-height: 44px;
    min-width: 44px;
}

.btn:active {
    transform: scale(0.98);
}

.btn-primary {
    background: var(--accent);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    background: var(--accent-light);
    
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: var(--bg-elevated);
    color: var(--text-primary);
    border: 1px solid var(--border-default);
}

.btn-secondary:hover {
    background: var(--bg-interactive);
    border-color: var(--accent);
}

.btn-ghost {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    text-decoration: none !important;
}

.btn-ghost:hover {
    color: var(--text-primary);
    background: var(--bg-overlay, rgba(255, 255, 255, 0.06));
    text-decoration: none !important;
}

.btn-danger {
    background: var(--danger);
    color: white;
}

.btn-facebook {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background: #1877F2;
    color: #FFFFFF !important;
    border: 1px solid transparent;
    box-shadow: 0 2px 8px rgba(24, 119, 242, 0.25);
    transition: all 0.18s cubic-bezier(0.16, 1, 0.3, 1);
    font-weight: 600;
    text-decoration: none !important;
    cursor: pointer;
}

.btn-facebook:hover {
    background: #166FE5;
    color: #FFFFFF !important;
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(24, 119, 242, 0.38);
}

.btn-facebook:active {
    transform: translateY(0);
}

.btn-facebook svg,
.btn-facebook .fb-icon {
    fill: currentColor;
    flex-shrink: 0;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: var(--text-sm);
    min-height: 36px;
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: var(--text-lg);
    border-radius: var(--radius-md);
}

.btn-icon {
    width: 40px;
    height: 40px;
    padding: 0;
}

/* ============================================
   CARDS
   ============================================ */

.card {
    background: var(--bg-elevated);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    transition: all var(--duration-base) var(--ease-out);
    box-shadow: var(--shadow-md);
}

.card:hover {
    
    box-shadow: var(--shadow-lg);
    border-color: var(--border-strong);
}

.card-interactive {
    cursor: pointer;
}

.card-interactive:active {
    transform: scale(0.99);
}

.card-flat {
    box-shadow: none;
}

/* ============================================
   INPUTS
   ============================================ */

.input {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--bg-elevated);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-md);
    font-size: var(--text-base);
    color: var(--text-primary);
    transition: all var(--duration-fast) var(--ease-out);
    min-height: 44px;
}

.input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-soft);
}

.input::placeholder {
    color: var(--text-tertiary);
}

.input-lg {
    padding: 1rem 1.25rem;
    font-size: var(--text-lg);
}

.textarea {
    min-height: 120px;
    resize: vertical;
}

.form-group {
    margin-bottom: var(--space-5);
}

.label {
    display: block;
    font-size: var(--text-sm);
    font-weight: var(--weight-medium);
    color: var(--text-secondary);
    margin-bottom: var(--space-2);
}

/* ============================================
   BADGES
   ============================================ */

.badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-1) var(--space-2);
    font-size: var(--text-xs);
    font-weight: var(--weight-semibold);
    border-radius: var(--radius-sm);
    text-transform: uppercase;
    letter-spacing: var(--tracking-wide);
}

.badge-primary {
    background: var(--accent-soft);
    color: var(--accent);
}

.badge-success {
    background: var(--success-soft);
    color: var(--success);
}

.badge-warning {
    background: var(--warning-soft);
    color: var(--warning);
}

.badge-danger {
    background: var(--danger-soft);
    color: var(--danger);
}

.badge-neutral {
    background: var(--bg-overlay);
    color: var(--text-secondary);
}

/* ============================================
   MODALS
   ============================================ */

.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    
    z-index: 10050;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-4);
    opacity: 0;
    visibility: hidden;
    transition: all var(--duration-base) var(--ease-out);
}

.modal-overlay.open {
    opacity: 1;
    visibility: visible;
}

.modal {
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    background: var(--bg-overlay);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-xl);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-xl);
    transform: scale(0.95) translateY(20px);
    transition: transform var(--duration-base) var(--ease-out);
}

.modal-overlay.open .modal {
    transform: scale(1) translateY(0);
}

.modal-lg {
    max-width: 700px;
}

.modal-sm {
    max-width: 400px;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-5);
    border-bottom: 1px solid var(--border-subtle);
}

.modal-title {
    font-size: var(--text-lg);
    font-weight: var(--weight-semibold);
}

.modal-close {
    width: 44px;
    height: 44px;
    min-width: 44px;
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-tertiary);
    border-radius: var(--radius-sm);
    transition: all var(--duration-fast) var(--ease-out);
    background: transparent;
    border: none;
    cursor: pointer;
    touch-action: manipulation;
}

.modal-close:hover {
    color: var(--text-primary);
    background: var(--bg-interactive);
}

.modal-close:active {
    transform: scale(0.92);
}

@media (max-width: 640px) {
    .modal-overlay {
        align-items: flex-end;
        padding: 0;
        z-index: 10050;
    }

    .modal {
        max-width: 100%;
        max-height: 88vh;
        border-radius: 20px 20px 0 0;
        border-bottom: none;
        padding-bottom: max(var(--space-6), env(safe-area-inset-bottom, 24px));
        transform: translateY(100%);
    }

    .modal-overlay.open .modal {
        transform: translateY(0);
    }

    .modal-header {
        position: relative;
        padding: var(--space-4);
    }

    .modal-body {
        padding: var(--space-4);
    }

    .modal-footer {
        padding: var(--space-4);
        display: flex;
        flex-direction: row;
        gap: 12px;
        align-items: center;
        justify-content: flex-end;
    }

    .modal-footer button,
    .modal-footer .btn {
        flex: 1 1 0%;
        width: auto;
        min-height: 46px;
    }
}

.modal-body {
    padding: var(--space-5);
    overflow-y: auto;
    flex: 1;
}

.modal-footer {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: var(--space-3);
    padding: var(--space-5);
    border-top: 1px solid var(--border-subtle);
}

/* ============================================
   TOAST
   ============================================ */

.toast-container {
    position: fixed;
    top: calc(64px + var(--space-4));
    right: var(--space-4);
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.toast {
    min-width: 280px;
    max-width: 400px;
    padding: var(--space-4);
    background: var(--bg-overlay);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-xl);
    display: flex;
    align-items: center;
    gap: var(--space-3);
    animation: slideInRight 0.3s var(--ease-spring);
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(100%);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.toast-success {
    border-left: 3px solid var(--success);
}

.toast-error {
    border-left: 3px solid var(--danger);
}

.toast-warning {
    border-left: 3px solid var(--warning);
}

.toast-message {
    flex: 1;
    font-size: var(--text-sm);
}

/* ============================================
   LOADING
   ============================================ */

.skeleton {
    background: linear-gradient(90deg, var(--bg-elevated) 25%, var(--bg-interactive) 50%, var(--bg-elevated) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s ease-in-out infinite;
    border-radius: var(--radius-sm);
}

@keyframes shimmer {
    0% {
        background-position: 200% 0;
    }

    100% {
        background-position: -200% 0;
    }
}

.spinner {
    width: 24px;
    height: 24px;
    border: 2px solid var(--border-default);
    border-top-color: var(--accent);
    border-radius: var(--radius-full);
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.lab-row-pending {
    animation: lab-pending-pulse 1.5s ease-in-out infinite;
}

@keyframes lab-pending-pulse {
    0%, 100% { opacity: 0.4; }
    50% { opacity: 0.8; }
}

/* ============================================
   SECTIONS & HEADERS
   ============================================ */

.section {
    margin-bottom: var(--space-8);
}

.section-header {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: var(--space-4);
    margin-bottom: var(--space-4);
    position: relative;
}

.section-title-wrap {
    display: flex;
    align-items: baseline;
    gap: var(--space-3);
    flex-wrap: wrap;
    min-width: 0;
}

.section-title {
    font-size: 1.2rem;
    font-weight: 700;
    letter-spacing: -0.01em;
    color: var(--text-primary);
    margin: 0;
}

.section-subtitle {
    font-size: 13px;
    color: var(--text-tertiary);
    margin: 0;
}

.section-count-badge {
    font-family: var(--font-mono);
    font-size: 11.5px;
    font-weight: 600;
    padding: 3px 10px;
    border-radius: var(--radius-full);
    background: var(--bg-overlay);
    border: 1px solid var(--border-default);
    color: var(--text-secondary);
    white-space: nowrap;
    flex-shrink: 0;
}

/* ============================================
   UTILITIES
   ============================================ */

/* Flex */
.flex {
    display: flex;
}

.flex-col {
    flex-direction: column;
}

.flex-wrap {
    flex-wrap: wrap;
}

.items-center {
    align-items: center;
}

.items-start {
    align-items: flex-start;
}

.items-end {
    align-items: flex-end;
}

.justify-center {
    justify-content: center;
}

.justify-between {
    justify-content: space-between;
}

.justify-end {
    justify-content: flex-end;
}

.flex-1 {
    flex: 1;
}

/* Gap */
.gap-1 {
    gap: var(--space-1);
}

.gap-2 {
    gap: var(--space-2);
}

.gap-3 {
    gap: var(--space-3);
}

.gap-4 {
    gap: var(--space-4);
}

.gap-5 {
    gap: var(--space-5);
}

.gap-6 {
    gap: var(--space-6);
}

.gap-8 {
    gap: var(--space-8);
}

/* Margin */
.mt-1 {
    margin-top: var(--space-1);
}

.mt-2 {
    margin-top: var(--space-2);
}

.mt-3 {
    margin-top: var(--space-3);
}

.mt-4 {
    margin-top: var(--space-4);
}

.mt-6 {
    margin-top: var(--space-6);
}

.mt-8 {
    margin-top: var(--space-8);
}

.mb-1 {
    margin-bottom: var(--space-1);
}

.mb-2 {
    margin-bottom: var(--space-2);
}

.mb-3 {
    margin-bottom: var(--space-3);
}

.mb-4 {
    margin-bottom: var(--space-4);
}

.mb-6 {
    margin-bottom: var(--space-6);
}

.mb-8 {
    margin-bottom: var(--space-8);
}

/* Padding */
.p-4 {
    padding: var(--space-4);
}

.p-6 {
    padding: var(--space-6);
}

.p-8 {
    padding: var(--space-8);
}

/* Text */
.text-center {
    text-align: center;
}

.text-left {
    text-align: left;
}

.text-right {
    text-align: right;
}

/* Display */
.hidden {
    display: none;
}

.block {
    display: block;
}

.inline-block {
    display: inline-block;
}

.inline-flex {
    display: inline-flex;
}

/* Width */
.w-full {
    width: 100%;
}

/* SR Only */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

/* Focus Visible */
*:focus {
    outline: none;
}

*:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/* ============================================
   BOTTOM NAVIGATION (Hidden on Desktop)
   ============================================ */

.bottom-nav {
    display: none !important;
}

.bottom-nav-item svg {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

/* ============================================
   RESPONSIVE (Mobile & Tablet)
   ============================================ */

@media (max-width: 768px) {
    .nav {
        display: none !important;
    }

    .header {
        height: calc(56px + env(safe-area-inset-top, 0px));
        padding-top: env(safe-area-inset-top, 0px);
        box-sizing: border-box;
    }

    .header-inner {
        padding: 0 10px;
        gap: 6px;
    }

    .logo {
        flex: 0 1 auto;
        min-width: 0;
        gap: 6px;
        font-size: 0.95rem;
    }

    .logo-mark {
        width: 28px;
        height: 28px;
    }

    .logo span {
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
        font-size: 0.9rem;
        max-width: 100px;
    }

    .header-actions {
        display: flex !important;
        align-items: center;
        gap: 4px;
        flex: 1 0 auto;
        justify-content: flex-end;
    }

    .cc-balance-badge {
        height: 30px !important;
        padding: 0 7px !important;
        font-size: 11px !important;
        gap: 4px !important;
        border-radius: var(--radius-full) !important;
        border: 1px solid var(--border-default) !important;
    }

    .cc-balance-mark {
        width: 14px !important;
        height: 14px !important;
        font-size: 9px !important;
    }

    .header-actions .lang-switch-btn,
    .header-actions .btn-lang-toggle,
    .header-actions .lang-toggle-btn {
        font-size: 12px;
        padding: 0 6px;
        height: 30px;
        border-radius: var(--radius-md, 6px);
    }

    .theme-toggle,
    .icon-btn {
        width: 30px !important;
        height: 30px !important;
        border-radius: var(--radius-md, 6px) !important;
        border: none !important;
        background: transparent !important;
    }

    .avatar {
        width: 30px !important;
        height: 30px !important;
        border-radius: var(--radius-full) !important;
        font-size: 11.5px !important;
        flex-shrink: 0 !important;
    }

    .main {
        padding-top: calc(56px + 12px) !important;
        padding-bottom: calc(56px + env(safe-area-inset-bottom, 0px) + 36px) !important;
        padding-left: 16px !important;
        padding-right: 16px !important;
    }

    /* Section Headers on Mobile */
    .section-header {
        display: flex !important;
        flex-direction: column !important;
        align-items: flex-start !important;
        gap: 3px !important;
        position: relative !important;
        margin-bottom: var(--space-3) !important;
    }

    .section-title-wrap {
        display: flex !important;
        flex-direction: column !important;
        align-items: flex-start !important;
        gap: 2px !important;
        width: 100% !important;
        padding-right: 105px !important;
    }

    .section-title {
        font-size: 1.15rem !important;
        white-space: nowrap !important;
        line-height: 1.2 !important;
    }

    .section-subtitle {
        font-size: 11.5px !important;
        color: var(--text-tertiary) !important;
        line-height: 1.3 !important;
        display: block !important;
    }

    .section-count-badge {
        position: absolute !important;
        top: 0 !important;
        right: 0 !important;
        font-size: 10.5px !important;
        padding: 2.5px 8px !important;
        white-space: nowrap !important;
    }

    /* Mobile Bottom Navigation Bar */
    .bottom-nav {
        display: block !important;
        position: fixed !important;
        bottom: 0 !important;
        left: 0 !important;
        right: 0 !important;
        width: 100% !important;
        height: calc(66px + env(safe-area-inset-bottom, 0px)) !important;
        min-height: 66px !important;
        background: rgba(255, 255, 255, 0.96) !important;
        backdrop-filter: blur(24px) saturate(180%) !important;
        -webkit-backdrop-filter: blur(24px) saturate(180%) !important;
        border-top: 1px solid var(--border-default) !important;
        padding-bottom: env(safe-area-inset-bottom, 0px) !important;
        z-index: 9999 !important;
        box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.06) !important;
        box-sizing: border-box !important;
        transform: translateZ(0) !important;
        -webkit-transform: translateZ(0) !important;
        overflow: hidden !important;
    }

    [data-theme="dark"] .bottom-nav {
        background: rgba(11, 16, 32, 0.95) !important;
        border-top: 1px solid rgba(255, 255, 255, 0.08) !important;
        box-shadow: 0 -4px 24px rgba(0, 0, 0, 0.45) !important;
    }

    .bottom-nav-inner {
        display: flex !important;
        align-items: center !important;
        justify-content: flex-start !important;
        height: 66px !important;
        width: 100% !important;
        max-width: 100% !important;
        margin: 0 !important;
        padding: 0 12px !important;
        gap: 6px !important;
        box-sizing: border-box !important;
        overflow-x: auto !important;
        overflow-y: hidden !important;
        -webkit-overflow-scrolling: touch !important;
        scroll-behavior: smooth !important;
        overscroll-behavior-x: contain !important;
        touch-action: pan-x !important;
        scrollbar-width: none !important;
        -ms-overflow-style: none !important;
    }

    .bottom-nav-inner::-webkit-scrollbar {
        display: none !important;
        width: 0 !important;
        height: 0 !important;
    }

    .bottom-nav-item {
        display: flex !important;
        flex-direction: column !important;
        align-items: center !important;
        justify-content: center !important;
        flex: 0 0 auto !important;
        min-width: 68px !important;
        height: 54px !important;
        min-height: 54px !important;
        gap: 3px !important;
        color: var(--text-tertiary) !important;
        text-decoration: none !important;
        padding: 4px 10px !important;
        border-radius: var(--radius-md, 10px) !important;
        transition: color 0.18s cubic-bezier(0.16, 1, 0.3, 1), transform 0.12s ease, background-color 0.18s ease !important;
        -webkit-tap-highlight-color: transparent !important;
        touch-action: manipulation pan-x !important;
        position: relative !important;
        white-space: nowrap !important;
        box-sizing: border-box !important;
    }

    .bottom-nav-item:active {
        transform: scale(0.94) !important;
    }

    .bottom-nav-item:hover,
    .bottom-nav-item:focus-visible {
        background-color: rgba(2, 132, 199, 0.05) !important;
    }

    .bottom-nav-item.active {
        color: var(--accent) !important;
        background-color: rgba(2, 132, 199, 0.08) !important;
    }

    [data-theme="dark"] .bottom-nav-item:hover,
    [data-theme="dark"] .bottom-nav-item:focus-visible {
        background-color: rgba(56, 189, 248, 0.06) !important;
    }

    [data-theme="dark"] .bottom-nav-item.active {
        color: var(--accent) !important;
        background-color: rgba(56, 189, 248, 0.12) !important;
    }

    .bottom-nav-item.active::after {
        content: '' !important;
        position: absolute !important;
        bottom: 2px !important;
        width: 20px !important;
        height: 2.5px !important;
        border-radius: 2px !important;
        background: var(--accent) !important;
        box-shadow: 0 1px 6px rgba(2, 132, 199, 0.45) !important;
    }

    .bottom-nav-item svg {
        width: 24px !important;
        height: 24px !important;
        stroke-width: 2 !important;
        flex-shrink: 0 !important;
        transition: transform 0.18s cubic-bezier(0.16, 1, 0.3, 1), stroke-width 0.18s ease !important;
    }

    .bottom-nav-item.active svg {
        stroke-width: 2.35 !important;
        transform: translateY(-1px) !important;
    }

    .bottom-nav-item span {
        font-size: 11px !important;
        font-weight: 600 !important;
        letter-spacing: -0.01em !important;
        line-height: 1.15 !important;
        white-space: nowrap !important;
        overflow: visible !important;
        text-overflow: clip !important;
        max-width: none !important;
        text-align: center !important;
        display: block !important;
    }

    @media (min-width: 640px) {
        .bottom-nav-inner {
            justify-content: center !important;
            gap: 12px !important;
        }
    }
}

@media (max-width: 768px) {
    /* Prevent iOS Safari auto-zoom on inputs < 16px */
    input, textarea, select {
        font-size: 16px !important;
    }
    button, .btn, a.btn, input[type="button"], input[type="submit"] {
        touch-action: manipulation;
    }
}

@media (max-width: 480px) {
    :root {
        font-size: 15px;
    }

    .header-actions .btn-sm {
        padding: 0.4rem 0.65rem;
    }

    .header-actions .btn-ghost {
        display: none;
    }

    .logo span {
        font-size: 0.9rem;
    }
}

/* Clinical Credits */
.cc-balance-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    height: 34px;
    padding: 0 11px;
    border: 1px solid var(--border-default);
    border-radius: var(--radius-full);
    background: var(--bg-overlay);
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 12.5px;
    font-weight: 600;
    text-decoration: none;
    white-space: nowrap;
    box-shadow: none;
    transition: all 0.15s ease;
    flex-shrink: 0;
}

.cc-balance-badge:hover {
    border-color: #10b981;
    background: var(--bg-elevated);
    box-shadow: none;
    transform: none;
}

.cc-balance-mark {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 18px;
    height: 18px;
    border-radius: var(--radius-full);
    background: rgba(16, 185, 129, 0.14);
    color: #10b981;
    font-size: 10.5px;
    flex-shrink: 0;
}

.cc-balance-unit {
    font-size: 11px;
    font-weight: 700;
    color: var(--text-tertiary);
}

.cc-toast {
    position: fixed;
    right: 1rem;
    bottom: 1rem;
    z-index: 1000;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-default);
    border-radius: var(--radius-lg);
    background: var(--bg-elevated);
    color: var(--text-primary);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    transform: translateY(8px);
    transition: opacity 160ms ease, transform 160ms ease;
}

.cc-toast.visible {
    opacity: 1;
    transform: translateY(0);
}

.cc-toast-source {
    font-size: var(--text-xs);
    color: var(--text-tertiary);
    text-transform: capitalize;
}

.cc-toast-amount {
    font-family: var(--font-mono);
    font-size: var(--text-sm);
    font-weight: var(--weight-semibold);
    color: var(--success);
}

@media (max-width: 480px) {
    .header-inner {
        padding: 0 8px;
        gap: 4px;
    }

    .logo span,
    .logo-text,
    .logo .logo-text {
        display: inline-block !important;
        font-size: 0.82rem;
        font-weight: 700;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
        max-width: 125px;
    }

    .cc-balance-badge {
        padding: 0 5px !important;
        font-size: 10.5px !important;
        height: 28px !important;
    }

    .cc-balance-mark {
        display: none;
    }

    .header-actions .lang-switch-btn,
    .header-actions .btn-lang-toggle,
    .header-actions .lang-toggle-btn {
        font-size: 11px;
        padding: 0 5px;
        height: 28px;
    }

    .theme-toggle,
    .icon-btn {
        width: 28px !important;
        height: 28px !important;
    }

    .avatar {
        width: 28px !important;
        height: 28px !important;
        font-size: 11px !important;
    }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ─── NOTIFICATION BELL ───
   The bell markup is duplicated verbatim on 13 pages (asserted by
   scripts/check-shell.mjs §6). Every rule below was previously an inline `style=`
   attribute repeated in all 13 copies, which meant a visual change to the panel was a
   13-file edit and drift was invisible. Behaviour lives in assets/js/notifications.js;
   this is the skin. Only `pricing.html` keeps one inline declaration — `display:none`
   on the wrapper, its own auth gate — and that is asserted, not accidental. */
.notif-wrapper { position: relative; }

/* The badge is positioned against the button, not the wrapper, so the button needs a
   containing block. Scoped to the bell rather than added to `.icon-btn`, which is
   shared with the theme toggle and other header buttons that must not gain one. */
.notif-wrapper > .icon-btn { position: relative; }

.notif-badge {
    display: none;                     /* revealed by NotifBell._loadBadge when count > 0 */
    position: absolute;
    top: 2px;
    right: 2px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--danger);
    border: 2px solid var(--bg-elevated);
    pointer-events: none;
}

.notif-dropdown {
    display: none;                     /* opened by NotifBell._open, which sets display:block */
    position: absolute;
    right: 0;
    top: calc(100% + 8px);
    width: 300px;
    max-height: 380px;
    overflow-y: auto;
    text-align: left;
    background: var(--bg-elevated);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    /* Deliberately NOT var(--z-dropdown). The scale at tokens.css:215-223 puts
       dropdowns at 100, but `.header` is 1000 and `.bottom-nav` is 9999, so adopting
       the token would push this panel *behind* both on all 13 pages. 10000 is exactly
       one above `.bottom-nav` and is the only value that works today. Realigning the
       scale to the real stacking order is a WAVE 2 task with its own browser pass. */
    z-index: 10000;
}

.notif-dropdown-header {
    padding: .75rem 1rem;
    border-bottom: 1px solid var(--border-subtle);
    font-size: var(--text-sm);
    font-weight: var(--weight-semibold);
}

.notif-list { padding: .25rem 0; }
.notif-item { padding:.65rem 1rem; border-bottom:1px solid var(--border-subtle); cursor:pointer; transition:background .15s; }
.notif-item:last-child { border-bottom:none; }
.notif-item:hover { background:var(--bg-overlay); }
.notif-unread { background:var(--primary-soft); }
.notif-title { font-size:var(--text-sm); font-weight:var(--weight-medium); color:var(--text-primary); }
.notif-msg { font-size:var(--text-xs); color:var(--text-secondary); margin-top:2px; line-height:1.4; }
.notif-time { font-size:var(--text-xs); color:var(--text-tertiary); margin-top:4px; }
.notif-empty { padding:.75rem 1rem; color:var(--text-tertiary); font-size:var(--text-sm); }

/* Icon Button */
.icon-btn {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    transition: all var(--duration-fast) var(--ease-out);
    background: transparent;
    border: none;
    cursor: pointer;
}

.icon-btn:hover {
    color: var(--text-primary);
    background: var(--bg-elevated);
}

.icon-btn svg {
    width: 20px;
    height: 20px;
}

/* Sub-navigation Header for Modes and Modules */
.nav-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 64px;
    z-index: 100;
    background: rgba(10, 10, 10, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-subtle);
    display: flex;
    align-items: center;
}

[data-theme="light"] .nav-header {
    background: rgba(255, 255, 255, 0.85);
    border-bottom: 1px solid var(--border-default);
}

.nav-inner {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
}

.nav-back {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    color: var(--text-secondary);
    font-size: var(--text-sm);
    font-weight: var(--weight-medium);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
    transition: all var(--duration-fast) var(--ease-out);
}

.nav-back:hover {
    color: var(--text-primary);
    transform: translateX(-4px);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.nav-actions .icon-btn {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-default);
    background: var(--bg-elevated);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--duration-fast);
}

.nav-actions .icon-btn:hover {
    color: var(--text-primary);
    background: var(--bg-interactive);
    border-color: var(--border-strong);
}

.nav-actions .lang-btn {
    height: 36px;
    padding: 0 var(--space-3);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-default);
    background: var(--bg-elevated);
    color: var(--text-secondary);
    font-size: var(--text-xs);
    font-weight: var(--weight-bold);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--duration-fast);
}

.nav-actions .lang-btn:hover {
    color: var(--text-primary);
    background: var(--bg-interactive);
    border-color: var(--border-strong);
}

/* Grid System for Mode Pages */
.grid {
    display: grid;
    gap: var(--space-6, 1.5rem);
}

.grid-2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

@media (max-width: 768px) {
    .grid-2 {
        grid-template-columns: 1fr;
    }
}

/* ==========================================================================
   STATE SURFACES  (empty / sign-in / offline / error)
   One component for the four reasons a data surface can have nothing to show.
   Rendered by assets/js/ui-states.js. Behaviour lives there; this is the skin.
   The `.empty-state` / `.error-state` class names already appear in page markup
   across the app but were never defined in any stylesheet — they are aliased
   onto this component here so the existing usages stop being unstyled divs.
   ========================================================================== */
.ui-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-3);
    padding: var(--space-10) var(--space-6);
    text-align: center;
    color: var(--text-secondary);
}

.ui-state__icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: var(--radius-full);
    background: var(--bg-interactive);
    color: var(--text-tertiary);
    flex: none;
}

.ui-state__title {
    margin: 0;
    font-size: var(--text-lg);
    font-weight: var(--weight-semibold);
    color: var(--text-primary);
    line-height: var(--leading-snug);
}

.ui-state__message {
    margin: 0;
    max-width: 46ch;
    font-size: var(--text-sm);
    line-height: var(--leading-relaxed);
    color: var(--text-secondary);
}

.ui-state__detail {
    margin: 0;
    font-size: var(--text-xs);
    color: var(--text-tertiary);
    font-family: var(--font-mono);
    word-break: break-word;
}

.ui-state__actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    margin-top: var(--space-1);
}

/* Tone: the icon is the only colour signal, so the state reads at a glance
   without turning the whole surface into an alert. */
.ui-state--signin .ui-state__icon { background: var(--info-soft); color: var(--info); }
.ui-state--offline .ui-state__icon { background: var(--warning-soft); color: var(--warning); }
.ui-state--error .ui-state__icon { background: var(--danger-soft); color: var(--danger); }

/* Existing page markup aliases */
.empty-state,
.error-state {
    padding: var(--space-10) var(--space-6);
    text-align: center;
    color: var(--text-secondary);
    font-size: var(--text-sm);
    line-height: var(--leading-relaxed);
}

.error-state {
    color: var(--danger);
}

@media (max-width: 480px) {
    .ui-state {
        padding: var(--space-8) var(--space-4);
    }

    .ui-state__actions {
        width: 100%;
        flex-direction: column;
    }

    .ui-state__actions > * {
        width: 100%;
    }
}