@import url('https://fonts.googleapis.com/css2?family=Kalnia+Glaze:wght@400;500;600&family=Playfair+Display:ital,wght@0,400;0,500;0,600;1,400;1,500;1,600&family=Noto+Serif+SC:wght@400;500;600&family=Noto+Serif+TC:wght@400;500;600&family=Noto+Serif+JP:wght@400;500;600&family=Noto+Serif+KR:wght@400;500;600&family=JetBrains+Mono:wght@400;500&display=swap');

/* --- 01. System Tokens & Core Variables --- */
:root {
    --font-base: 'Playfair Display', 'Noto Serif SC', 'Noto Serif TC', 'Noto Serif JP', 'Noto Serif KR', 'Songti SC', 'STSong', 'SimSun', serif;
    --font-display: 'Kalnia Glaze', 'Bitcount Single', var(--font-base);
    --font-mono: 'JetBrains Mono', monospace;
    
    --transition-flame: cubic-bezier(0.3, 0, 0.1, 1);
    --transition-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
    --transition-linear: cubic-bezier(0.4, 0, 0.2, 1);
    
    --ease-micro: 0.2s;
    --ease-base: 0.4s;
    --ease-macro: 0.8s;
    --ease-ambient: 1.2s;
    
    --brand-accent-violet-raw: 167, 139, 250;
    --brand-accent-orange-raw: 255, 154, 139;
    --brand-accent-violet: rgb(var(--brand-accent-violet-raw));
    --brand-accent-orange: rgb(var(--brand-accent-orange-raw));
    --brand-gradient-ember: linear-gradient(135deg, var(--brand-accent-violet) 0%, var(--brand-accent-orange) 100%);
    
    --bg-base: #050408;
    --bg-surface: #0a0812;
    --bg-surface-elevated: #141021;
    --bg-surface-hover: #1c162e;
    
    --glass-bg: rgba(10, 8, 18, 0.75);
    --glass-border: rgba(255, 255, 255, 0.08);
    --glass-blur: 24px;
    
    --text-primary: #ffffff;
    --text-secondary: #c2bacf;
    --text-muted: #7f7594;
    --text-inverse: #050408;
    
    --border-subtle: rgba(255, 255, 255, 0.04);
    --border-base: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(255, 255, 255, 0.15);
    --border-focus: var(--brand-accent-violet);
    
    --shadow-float: 0 20px 40px rgba(0, 0, 0, 0.4), 0 1px 3px rgba(0, 0, 0, 0.2);
    --shadow-dropdown: 0 10px 30px rgba(0, 0, 0, 0.5), 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-ember-glow: 0 4px 24px rgba(var(--brand-accent-violet-raw), 0.25);
    
    --grid-line: rgba(255, 255, 255, 0.03);
    
    --btn-bg: #ffffff;
    --btn-text: #050408;
    
    --spacing-1: 0.25rem;
    --spacing-2: 0.5rem;
    --spacing-3: 1rem;
    --spacing-4: 1.5rem;
    --spacing-5: 2rem;
    --spacing-6: 3rem;
    --spacing-8: 4rem;
    --spacing-10: 6rem;
    
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-pill: 99px;
    
    --z-ambient: 1;
    --z-base: 10;
    --z-dropdown: 100;
    --z-header: 200;
    --z-modal: 500;
    --z-toast: 1000;
}

/* --- 02. Theme Definitions (Light Mode) --- */
body.light-mode {
    --brand-accent-violet-raw: 139, 92, 246;
    --brand-accent-orange-raw: 249, 115, 22;
    --brand-accent-violet: rgb(var(--brand-accent-violet-raw));
    --brand-accent-orange: rgb(var(--brand-accent-orange-raw));
    
    --bg-base: #f9f7f5;
    --bg-surface: #ffffff;
    --bg-surface-elevated: #f4efea;
    --bg-surface-hover: #ebe4df;
    
    --glass-bg: rgba(255, 255, 255, 0.85);
    --glass-border: rgba(0, 0, 0, 0.04);
    
    --text-primary: #171311;
    --text-secondary: #4a423f;
    --text-muted: #827874;
    --text-inverse: #ffffff;
    
    --border-subtle: rgba(0, 0, 0, 0.03);
    --border-base: rgba(0, 0, 0, 0.06);
    --border-hover: rgba(0, 0, 0, 0.12);
    
    --shadow-float: 0 20px 40px rgba(0, 0, 0, 0.06), 0 1px 3px rgba(0, 0, 0, 0.03);
    --shadow-dropdown: 0 10px 30px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-ember-glow: 0 4px 24px rgba(var(--brand-accent-violet-raw), 0.15);
    
    --grid-line: rgba(0, 0, 0, 0.03);
    
    --btn-bg: #171311;
    --btn-text: #f9f7f5;
}

/* --- 03. Base Reset & Document Normalization --- */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    -ms-text-size-adjust: 100%;
    -webkit-text-size-adjust: 100%;
    scroll-behavior: smooth;
}

body {
    width: 100%;
    min-height: 100vh;
    font-family: var(--font-base);
    background-color: var(--bg-base);
    color: var(--text-primary);
    overflow-x: hidden;
    transition: background-color var(--ease-ambient) var(--transition-flame), 
                color var(--ease-ambient) var(--transition-flame);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

::selection {
    background: rgba(var(--brand-accent-violet-raw), 0.3);
    color: var(--text-primary);
}

::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: var(--bg-base);
}

::-webkit-scrollbar-thumb {
    background: var(--border-base);
    border-radius: var(--radius-pill);
    transition: background var(--ease-micro) var(--transition-linear);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--border-hover);
}

/* --- 04. Global Editorial Typography System --- */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    color: var(--text-primary);
    letter-spacing: 0.02em;
}

.text-gradient {
    background: var(--brand-gradient-ember);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Increased font-weight for legibility */
.glaze-text {
    font-family: var(--font-display) !important;
    font-style: normal !important;
    font-weight: 600 !important;
    color: inherit !important;
}

:lang(zh-Hans) .glaze-text,
:lang(zh-Hant) .glaze-text,
:lang(ja) .glaze-text,
:lang(ko) .glaze-text {
    font-family: 'Kaiti SC', 'STKaiti', 'BiauKai', var(--font-base) !important;
    font-style: normal !important;
    font-weight: 600 !important;
    color: inherit !important;
}

/* --- 05. App Shell: Ambient Canvas & Grid Background --- */
#ambient-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: var(--z-ambient);
    pointer-events: none;
    opacity: 0.95;
    mix-blend-mode: screen;
}

body.light-mode #ambient-canvas {
    mix-blend-mode: multiply;
    opacity: 0.6;
}

.grid-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(to right, var(--grid-line) 1px, transparent 1px),
        linear-gradient(to bottom, var(--grid-line) 1px, transparent 1px);
    background-size: 8vw 8vh;
    z-index: calc(var(--z-ambient) + 1);
    pointer-events: none;
    transition: background-image var(--ease-ambient) var(--transition-flame);
}

/* --- 06. App Shell: Global Header Architecture --- */
.header, .mobile-header {
    position: fixed;
    top: var(--spacing-4);
    left: 50%;
    transform: translateX(-50%);
    width: 94%;
    max-width: 1600px;
    padding: var(--spacing-3) var(--spacing-5);
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-pill);
    z-index: var(--z-header);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background var(--ease-ambient) var(--transition-flame), 
                border var(--ease-ambient) var(--transition-flame);
                
    box-shadow: 0 12px 40px rgba(var(--brand-accent-violet-raw), 0.35), 
                0 4px 15px rgba(var(--brand-accent-orange-raw), 0.2), 
                inset 0 1px 0 rgba(255, 255, 255, 0.15);
}

body.light-mode .header,
body.light-mode .mobile-header {
    box-shadow: 0 12px 40px rgba(var(--brand-accent-violet-raw), 0.25), 
                0 4px 15px rgba(var(--brand-accent-orange-raw), 0.15), 
                inset 0 1px 0 rgba(255, 255, 255, 0.6);
}

.mobile-header {
    top: 1rem;
    padding: 0.8rem 1.2rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    text-decoration: none;
    transition: opacity var(--ease-base) var(--transition-flame);
    cursor: pointer;
}

.logo:hover {
    opacity: 0.6;
}

.logo-text {
    font-family: var(--font-base);
    font-size: 1.25rem;
    font-weight: 600;
    letter-spacing: 0.15em;
    color: var(--text-primary);
}

.controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
}

/* --- 07. SaaS Interaction Controls (Dropdowns & Theme Toggles) --- */
.dropdown-trigger, .theme-toggle-btn {
    background: transparent;
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-pill);
    color: var(--text-primary);
    font-family: var(--font-base);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--ease-base) var(--transition-flame);
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.dropdown-trigger {
    padding: 0.6rem 1.4rem;
    font-size: 0.85rem;
    font-weight: 500;
    letter-spacing: 0.04em;
    gap: 0.6rem;
}

.theme-toggle-btn {
    width: 42px;
    height: 42px;
}

.dropdown-trigger:hover, .theme-toggle-btn:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--border-hover);
}

body.light-mode .dropdown-trigger:hover, 
body.light-mode .theme-toggle-btn:hover {
    background: rgba(0, 0, 0, 0.03);
}

.icon-svg { 
    width: 16px; 
    height: 16px; 
    stroke: currentColor;
    transition: stroke var(--ease-base) var(--transition-flame); 
}

.chevron { 
    width: 10px; 
    height: 10px; 
    stroke: currentColor;
    transition: transform var(--ease-base) var(--transition-bounce); 
}

.custom-dropdown { position: relative; }
.custom-dropdown.active .chevron { transform: rotate(180deg); }

.dropdown-menu {
    position: absolute;
    top: calc(100% + 12px);
    right: 0;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    width: 200px;
    padding: var(--spacing-2);
    list-style: none;
    box-shadow: var(--shadow-dropdown);
    opacity: 0;
    pointer-events: none;
    transform: translateY(10px) scale(0.98);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    transition: opacity var(--ease-base) var(--transition-flame), 
                transform var(--ease-base) var(--transition-flame);
    z-index: var(--z-dropdown);
    transform-origin: top right;
}

.custom-dropdown.active .dropdown-menu {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0) scale(1);
}

.dropdown-menu li {
    padding: 0.7rem 1rem;
    font-size: 0.9rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
    cursor: pointer;
    color: var(--text-secondary);
    transition: all var(--ease-micro) var(--transition-linear);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.dropdown-menu li:hover {
    background-color: var(--border-subtle);
    color: var(--text-primary);
    transform: translateX(4px);
}

body.dark-mode .icon-sun { transform: translateY(28px) rotate(45deg); opacity: 0; }
body.dark-mode .icon-moon { transform: translateY(0) rotate(0); opacity: 1; }
body.light-mode .icon-sun { transform: translateY(0) rotate(0); opacity: 1; }
body.light-mode .icon-moon { transform: translateY(-28px) rotate(-45deg); opacity: 0; }

.theme-toggle-btn .icon-svg {
    position: absolute;
    transition: all var(--ease-macro) var(--transition-bounce);
}

/* --- 08. Core App Shell Layout Structure --- */
#desktop-layout .viewport-container {
    position: relative;
    z-index: var(--z-base);
    min-height: 100vh;
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: var(--spacing-10) 4% var(--spacing-8) 4%;
}

#desktop-layout .immersive-content {
    width: 100%;
    max-width: 1400px;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    animation: contentFadeUp 1.4s var(--transition-flame) forwards;
    will-change: transform, opacity;
}

@keyframes contentFadeUp {
    0% { opacity: 0; transform: translateY(40px); }
    100% { opacity: 1; transform: translateY(0); }
}

.title-heading, .mobile-heading {
    font-family: var(--font-display);
    font-size: clamp(3.5rem, 7vw, 6.5rem);
    font-weight: 500;
    line-height: 1.05;
    letter-spacing: -0.01em;
    text-shadow: 0 10px 40px rgba(0,0,0,0.1);
}

#desktop-layout .title-heading {
    margin-bottom: var(--spacing-6);
}

/* Fixed vertical centering for multi-column grids */
#desktop-layout .content-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-8);
    max-width: 1000px;
    align-items: center;
    text-align: left;
    margin-bottom: var(--spacing-8);
}

/* Increased font sizing for better legibility */
#desktop-layout .body-description {
    font-size: clamp(1.15rem, 2vw, 1.25rem);
    color: var(--text-primary);
    opacity: 0.9;
    line-height: 1.85;
    font-weight: 500;
}

/* Ensure vertical stretch matches footnote content height */
#desktop-layout .footnote-wrapper {
    display: flex;
    align-items: stretch;
    gap: var(--spacing-3);
}

.footnote-line-decor {
    width: 2px;
    background: linear-gradient(to bottom, var(--brand-accent-violet), transparent);
    flex-shrink: 0;
    border-radius: var(--radius-pill);
}

#desktop-layout .footnote-text {
    font-size: 1.1rem;
    font-style: italic;
    line-height: 1.6;
    font-weight: 500;
    color: var(--text-primary);
    opacity: 0.8;
}

#desktop-layout .structural-footer {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-3) var(--spacing-6);
    border-top: 1px solid var(--border-subtle);
    background: rgba(0,0,0,0.02);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    letter-spacing: 0.04em;
    color: var(--text-muted);
    z-index: var(--z-header);
}

/* --- 09. Advanced SaaS Button System --- */
.btn-editorial {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-3);
    background-color: var(--btn-bg);
    color: var(--btn-text);
    text-decoration: none;
    font-family: var(--font-base);
    font-size: 0.95rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    padding: 1.2rem 3.5rem;
    border-radius: var(--radius-pill);
    border: 1px solid transparent;
    box-shadow: 0 15px 30px rgba(0,0,0,0.15);
    transition: all var(--ease-base) var(--transition-flame);
    position: relative;
    overflow: hidden;
}

.btn-editorial::before {
    content: '';
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background: var(--brand-gradient-ember);
    opacity: 0;
    transition: opacity var(--ease-base) var(--transition-flame);
    z-index: 1;
}

.btn-editorial > * {
    position: relative;
    z-index: 2;
}

.btn-editorial:hover {
    color: #ffffff;
    box-shadow: var(--shadow-ember-glow);
    transform: translateY(-4px) scale(1.02);
}

.btn-editorial:hover::before {
    opacity: 1;
}

.btn-arrow {
    width: 16px;
    height: 16px;
    transition: transform var(--ease-base) var(--transition-bounce);
    fill: currentColor;
}

.btn-editorial:hover .btn-arrow {
    transform: translateX(8px);
}

.btn-ghost {
    background: transparent;
    border: 1px solid var(--border-base);
    color: var(--text-primary);
    padding: 0.8rem 2rem;
    border-radius: var(--radius-pill);
    font-weight: 500;
    transition: all var(--ease-micro) var(--transition-linear);
}

.btn-ghost:hover {
    background: var(--border-subtle);
    border-color: var(--border-hover);
}

/* --- 10. SaaS Enterprise Form Elements --- */
.saas-form-group {
    position: relative;
    margin-bottom: var(--spacing-4);
    width: 100%;
}

.saas-input {
    width: 100%;
    background: var(--bg-surface-elevated);
    border: 1px solid var(--border-base);
    color: var(--text-primary);
    padding: 1.2rem 1rem 0.6rem;
    border-radius: var(--radius-md);
    font-family: var(--font-base);
    font-size: 1.1rem;
    outline: none;
    transition: all var(--ease-base) var(--transition-flame);
}

.saas-input:focus {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 1px var(--border-focus), var(--shadow-ember-glow);
    background: var(--bg-surface);
}

.saas-label {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.1rem;
    color: var(--text-muted);
    pointer-events: none;
    transition: all var(--ease-base) var(--transition-flame);
}

.saas-input:focus ~ .saas-label,
.saas-input:not(:placeholder-shown) ~ .saas-label {
    top: 0.5rem;
    transform: translateY(0);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--brand-accent-violet);
    letter-spacing: 0.05em;
}

.saas-toggle {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 24px;
}

.saas-toggle input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: var(--border-base);
    transition: .4s var(--transition-flame);
    border-radius: var(--radius-pill);
}

.toggle-slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: var(--text-primary);
    transition: .4s var(--transition-bounce);
    border-radius: 50%;
}

.saas-toggle input:checked + .toggle-slider {
    background: var(--brand-gradient-ember);
}

.saas-toggle input:checked + .toggle-slider:before {
    transform: translateX(20px);
}

/* --- 11. SaaS Data Display (Tables & Metric Cards) --- */
.saas-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-base);
    border-radius: var(--radius-lg);
    padding: var(--spacing-5);
    box-shadow: var(--shadow-float);
    transition: transform var(--ease-base) var(--transition-flame),
                box-shadow var(--ease-base) var(--transition-flame),
                border-color var(--ease-base) var(--transition-flame);
}

.saas-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-ember-glow), var(--shadow-float);
    border-color: var(--border-hover);
}

.metric-value {
    font-family: var(--font-mono);
    font-size: 2.5rem;
    font-weight: 500;
    color: var(--text-primary);
    margin: var(--spacing-2) 0;
}

.saas-table-container {
    width: 100%;
    overflow-x: auto;
    border: 1px solid var(--border-base);
    border-radius: var(--radius-lg);
    background: var(--bg-surface);
}

.saas-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
    font-size: 1.05rem;
}

.saas-table th, .saas-table td {
    padding: 1.2rem;
    border-bottom: 1px solid var(--border-subtle);
}

.saas-table th {
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-size: 0.85rem;
    background: rgba(0,0,0,0.02);
}

.saas-table tr {
    transition: background var(--ease-micro) var(--transition-linear);
}

.saas-table tbody tr:hover {
    background: var(--bg-surface-elevated);
}

.saas-badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-pill);
    font-size: 0.8rem;
    font-weight: 600;
    font-family: var(--font-mono);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.badge-success {
    background: rgba(16, 185, 129, 0.1);
    color: #10b981;
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.badge-warning {
    background: rgba(var(--brand-accent-orange-raw), 0.1);
    color: var(--brand-accent-orange);
    border: 1px solid rgba(var(--brand-accent-orange-raw), 0.2);
}

/* --- 12. Overlays & Feedback (Modals, Toasts, Skeletons) --- */
.saas-modal-backdrop {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: var(--z-modal);
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--ease-base) var(--transition-flame);
}

.saas-modal-backdrop.is-open {
    opacity: 1;
    pointer-events: auto;
}

.saas-modal-surface {
    background: var(--bg-surface);
    border: 1px solid var(--border-base);
    border-radius: var(--radius-lg);
    width: 90%;
    max-width: 500px;
    padding: var(--spacing-6);
    box-shadow: var(--shadow-float), var(--shadow-ember-glow);
    transform: scale(0.95) translateY(20px);
    transition: transform var(--ease-macro) var(--transition-bounce);
}

.saas-modal-backdrop.is-open .saas-modal-surface {
    transform: scale(1) translateY(0);
}

.saas-toast-container {
    position: fixed;
    bottom: var(--spacing-5);
    right: var(--spacing-5);
    z-index: var(--z-toast);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2);
}

.saas-toast {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    padding: 1rem 1.5rem;
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 1.05rem;
    box-shadow: var(--shadow-float);
    display: flex;
    align-items: center;
    gap: 1rem;
    transform: translateX(120%);
    transition: transform var(--ease-macro) var(--transition-bounce);
}

.saas-toast.show {
    transform: translateX(0);
}

.skeleton-box {
    background: linear-gradient(90deg, var(--bg-surface-elevated) 25%, var(--border-base) 50%, var(--bg-surface-elevated) 75%);
    background-size: 400% 100%;
    animation: skeleton-loading 1.5s infinite ease-in-out;
    border-radius: var(--radius-sm);
}

@keyframes skeleton-loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* --- 13. Mobile App Interface Integration --- */
#mobile-layout {
    position: relative;
    z-index: var(--z-base);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

#mobile-layout .mobile-trigger {
    width: 40px;
    height: 40px;
    padding: 0;
    border-radius: 50%;
}

#mobile-layout .mobile-viewport {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 7rem 6% 5rem 6%;
    animation: contentFadeUp 1.2s var(--transition-flame) forwards;
    text-align: left;
    will-change: transform, opacity;
}

#mobile-layout .mobile-heading {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 10vw, 3.5rem);
    font-weight: 500;
    line-height: 1.15;
    margin-bottom: var(--spacing-5);
    word-wrap: break-word;
    overflow-wrap: break-word;
    hyphens: auto;
}

#mobile-layout .mobile-content-grid {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-4);
    text-align: left;
    margin-bottom: var(--spacing-6);
}

#mobile-layout .mobile-desc {
    font-size: 1.2rem;
    color: var(--text-primary);
    opacity: 0.9;
    line-height: 1.8;
    font-weight: 500;
}

#mobile-layout .mobile-footnote-wrapper {
    display: flex;
    align-items: stretch;
    gap: var(--spacing-3);
}

#mobile-layout .mobile-warning {
    font-size: 1.1rem;
    font-style: italic;
    color: var(--text-primary);
    opacity: 0.8;
    line-height: 1.6;
    font-weight: 500;
}

#mobile-layout .mobile-action {
    display: flex;
    justify-content: flex-start;
}

#mobile-layout .mobile-btn {
    width: auto;
    padding: 1.1rem 2.5rem;
    font-size: 0.95rem;
}

#mobile-layout .mobile-footer {
    padding: var(--spacing-5) var(--spacing-4);
    text-align: center;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    letter-spacing: 0.04em;
    color: var(--text-muted);
    background: transparent;
}

/* --- 14. Display Special Typography --- */
.massive-404 {
    font-family: var(--font-display);
    font-size: clamp(5rem, 16vw, 10rem) !important;
    margin-bottom: 0 !important;
    line-height: 1 !important;
    background: var(--brand-gradient-ember);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0 10px 20px rgba(var(--brand-accent-violet-raw), 0.2));
}

/* --- 15. Utility & Spacing Classes --- */
.flex-center { display: flex; align-items: center; justify-content: center; }
.text-center { text-align: center; }
.mt-1 { margin-top: var(--spacing-1); }
.mt-2 { margin-top: var(--spacing-2); }
.mt-3 { margin-top: var(--spacing-3); }
.mt-4 { margin-top: var(--spacing-4); }
.mb-1 { margin-bottom: var(--spacing-1); }
.mb-2 { margin-bottom: var(--spacing-2); }
.mb-3 { margin-bottom: var(--spacing-3); }
.mb-4 { margin-bottom: var(--spacing-4); }
.w-full { width: 100%; }
.h-full { height: 100%; }
.relative { position: relative; }
.absolute { position: absolute; }
.overflow-hidden { overflow: hidden; }

@media (max-width: 768px) {
    #desktop-layout .content-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-4);
    }
}

/* --- 16. Clerk Absolute Reskin (Flame Security Design System) --- */

/* 1. Global Reset & Fonts */
.cl-rootBox, .cl-rootBox * {
    font-family: var(--font-base) !important;
}
.cl-card, .cl-userProfile-root, .cl-internal-1hqkstz {
    background: transparent !important;
    border: none !important;
    box-shadow: none !important;
}

/* 2. Typography Mapping */
.cl-headerTitle, .cl-profileSectionTitleText {
    font-family: var(--font-display) !important;
    font-size: clamp(2rem, 4vw, 2.5rem) !important;
    color: var(--text-primary) !important;
    font-weight: 500 !important;
}
.cl-headerSubtitle, .cl-formFieldLabel, .cl-dividerText {
    color: var(--text-muted) !important;
    font-size: 0.95rem !important;
    letter-spacing: 0.02em !important;
}

/* 3. Input Fields (Mapped to .saas-input) */
.cl-formFieldInput {
    background: var(--bg-surface-elevated) !important;
    border: 1px solid var(--border-base) !important;
    color: var(--text-primary) !important;
    border-radius: var(--radius-md) !important;
    padding: 1.2rem 1rem !important;
    font-size: 1.1rem !important;
    transition: all var(--ease-base) var(--transition-flame) !important;
}
.cl-formFieldInput:focus {
    border-color: var(--border-focus) !important;
    box-shadow: 0 0 0 1px var(--border-focus), var(--shadow-ember-glow) !important;
    background: var(--bg-surface) !important;
    outline: none !important;
}

/* 4. Primary Button (Mapped to .btn-editorial) */
.cl-formButtonPrimary, .cl-profileSectionPrimaryButton {
    background: var(--brand-gradient-ember) !important;
    color: #ffffff !important;
    font-weight: 600 !important;
    letter-spacing: 0.08em !important;
    padding: 1.2rem 2.5rem !important;
    border-radius: var(--radius-pill) !important;
    border: none !important;
    box-shadow: 0 15px 30px rgba(0,0,0,0.15) !important;
    transition: all var(--ease-base) var(--transition-flame) !important;
    text-transform: none !important;
}
.cl-formButtonPrimary:hover, .cl-profileSectionPrimaryButton:hover {
    box-shadow: var(--shadow-ember-glow) !important;
    transform: translateY(-2px) scale(1.02) !important;
}

/* 5. OAuth/Social Buttons (Mapped to .btn-ghost) */
.cl-socialButtonsBlockButton {
    background: transparent !important;
    border: 1px solid var(--border-base) !important;
    color: var(--text-primary) !important;
    border-radius: var(--radius-pill) !important;
    padding: 0.8rem 2rem !important;
    font-weight: 500 !important;
    transition: all var(--ease-micro) var(--transition-linear) !important;
}
.cl-socialButtonsBlockButton:hover {
    background: var(--border-subtle) !important;
    border-color: var(--border-hover) !important;
}

/* 6. Layout Dividers */
.cl-dividerLine {
    background: var(--border-base) !important;
}
.cl-profileSectionItem {
    border-bottom: 1px solid var(--border-subtle) !important;
    padding: 1.5rem 0 !important;
}

/* 7. Footer Links & "Secured by Clerk" Integration */
.cl-footerActionText {
    color: var(--text-secondary) !important;
}
.cl-footerActionLink {
    color: var(--brand-accent-violet) !important;
    font-weight: 600 !important;
    transition: opacity var(--ease-micro) ease !important;
}
.cl-footerActionLink:hover {
    opacity: 0.8 !important;
}
/* Beautifully blending the Secured By badge into your footer */
.cl-footerItem, .cl-internal-1scq7x4, .cl-internal-1scxde7 svg {
    color: var(--text-muted) !important;
    opacity: 0.8;
    transition: opacity var(--ease-micro) ease !important;
}
.cl-footerItem:hover {
    opacity: 1 !important;
}

/* 8. User Profile Sidebar Navbar */
.cl-navbar {
    border-right: 1px solid var(--border-base) !important;
    background: transparent !important;
    padding-right: 1rem !important;
}
.cl-navbarButton {
    color: var(--text-secondary) !important;
    border-radius: var(--radius-md) !important;
    transition: all var(--ease-micro) var(--transition-linear) !important;
}
.cl-navbarButton:hover {
    background-color: var(--border-subtle) !important;
    color: var(--text-primary) !important;
}
.cl-navbarButton[data-active="true"] {
    background: rgba(var(--brand-accent-violet-raw), 0.1) !important;
    color: var(--brand-accent-violet) !important;
}

/* 9. Badges & Data Displays */
.cl-badge {
    background: rgba(var(--brand-accent-violet-raw), 0.1) !important;
    color: var(--brand-accent-violet) !important;
    border: 1px solid rgba(var(--brand-accent-violet-raw), 0.2) !important;
    border-radius: var(--radius-pill) !important;
    font-family: var(--font-mono) !important;
    padding: 0.25rem 0.75rem !important;
}
.cl-userPreviewMainIdentifierText, .cl-internal-7dcyil, .cl-internal-53p03o {
    color: var(--text-primary) !important;
}

/* 10. Hide redundant elements */
.cl-footer {
    background: transparent !important;
    border-top: none !important;
}