/* ==========================================================================
   VERCEL DESIGN SYSTEM: STYLE SHEET
   Conforms strictly to vercel/DESIGN.md
   ========================================================================== */

:root {
    /* Color Tokens from vercel/DESIGN.md */
    --color-primary: #171717;          /* Stark black primary CTA */
    --color-on-primary: #ffffff;
    --color-ink: #171717;              /* Ink near black */
    --color-body: #4d4d4d;             /* Secondary body text */
    --color-mute: #888888;             /* Muted gray text */
    
    --color-canvas: #ffffff;           /* Pure white card / surfaces */
    --color-canvas-soft: #fafafa;      /* Stark near-white default canvas body */
    --color-canvas-soft-2: #f5f5f5;    /* Inset canvas / code editor background */
    
    --color-hairline: #ebebeb;         /* 1px hairline borders */
    --color-hairline-strong: #a1a1a1;  /* High-contrast hairline strong */
    
    --color-link: #0070f3;             /* Brand blue link */
    --color-link-deep: #0761d1;
    --color-link-bg-soft: #d3e5ff;
    
    --color-success: #0070f3;          /* Success brand blue link */
    --color-error: #ee0000;
    --color-error-soft: #f7d4d6;
    --color-error-deep: #c50000;
    --color-warning: #f5a623;
    --color-warning-soft: #ffefcf;
    --color-warning-deep: #ab570a;
    
    --color-violet: #7928ca;
    --color-violet-soft: #d8ccf1;
    --color-violet-deep: #4c2889;
    
    --color-cyan: #50e3c2;
    --color-cyan-soft: #aaffec;
    --color-cyan-deep: #29bc9b;
    
    --color-highlight-pink: #ff0080;
    --color-highlight-magenta: #eb367f;
    
    --color-selection-bg: #171717;
    --color-selection-fg: #f2f2f2;
    
    /* Typography stacks from vercel/DESIGN.md */
    --font-display: "Geist", "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-text: "Geist", "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-mono: "Geist Mono", "JetBrains Mono", "SFMono-Regular", Menlo, Monaco, Consolas, monospace;
    
    /* Rounded Radius Scale from vercel/DESIGN.md */
    --rounded-none: 0px;
    --rounded-xs: 4px;
    --rounded-sm: 6px;
    --rounded-md: 8px;
    --rounded-lg: 12px;
    --rounded-xl: 16px;
    --rounded-pill-sm: 64px;
    --rounded-pill: 100px;
    --rounded-full: 9999px;
    
    /* Transition speed - listed explicitly to comply with guidelines */
    --transition-studio: background-color 0.2s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.2s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.2s cubic-bezier(0.16, 1, 0.3, 1), transform 0.2s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.2s cubic-bezier(0.16, 1, 0.3, 1), color 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

:root[data-theme="dark"] {
    --color-primary: #ffffff;          /* Stark white primary CTA */
    --color-on-primary: #171717;
    --color-ink: #ffffff;              /* Ink near white */
    --color-body: #a1a1a1;             /* Secondary body text light gray */
    --color-mute: #71717a;             /* Muted text darker gray */
    
    --color-canvas: #0a0a0a;           /* Near-black card / surfaces */
    --color-canvas-soft: #000000;      /* Stark pure black body */
    --color-canvas-soft-2: #18181b;    /* Inset canvas */
    
    --color-hairline: #27272a;         /* Dark hairline borders */
    --color-hairline-strong: #3f3f46;  /* High-contrast dark hairline */
    
    --color-selection-bg: #ffffff;
    --color-selection-fg: #000000;
}

/* ==========================================================================
   RESET & GLOBAL BASICS
   ========================================================================== */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    background-color: var(--color-canvas-soft);
    color: var(--color-body);
    font-family: var(--font-text);
    font-size: 14px;
    font-weight: 400;
    line-height: 1.5;
    min-height: 100vh;
}

/* Selection aesthetics */
::selection {
    background-color: var(--color-selection-bg);
    color: var(--color-selection-fg);
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
::-webkit-scrollbar-track {
    background: var(--color-canvas-soft);
}
::-webkit-scrollbar-thumb {
    background: #d4d4d8;
    border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
    background: #a1a1aa;
}

/* Helper fonts */
.font-inter { font-family: var(--font-text); }
.eyebrow-mono {
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: 500;
    letter-spacing: 0.15em;
    color: var(--color-mute);
    margin-bottom: 8px;
    display: inline-block;
}

/* ==========================================================================
   GLOBAL TOP BAR NAVIGATION (global-nav)
   ========================================================================== */
.global-nav {
    background-color: var(--color-canvas);
    color: var(--color-ink);
    border-bottom: 1px solid var(--color-hairline);
    height: 64px;
    width: 100%;
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    align-items: center;
}

.nav-container {
    max-width: 1400px;
    width: 100%;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
}

.nav-brand {
    color: var(--color-ink);
    font-family: var(--font-display);
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    letter-spacing: -0.5px;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: var(--transition-studio);
}

.nav-brand:hover {
    opacity: 0.85;
}

.nav-brand svg.vercel-triangle {
    fill: var(--color-ink);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-item {
    color: var(--color-body);
    font-family: var(--font-text);
    font-size: 14px;
    font-weight: 400;
    text-decoration: none;
    padding: 6px 12px;
    border-radius: var(--rounded-pill-sm);
    transition: var(--transition-studio);
}

.nav-item:hover {
    color: var(--color-ink);
    background-color: var(--color-canvas-soft-2);
}

.nav-item.active {
    color: var(--color-ink);
    font-weight: 500;
    background-color: var(--color-canvas-soft-2);
}

.nav-actions {
    display: flex;
    align-items: center;
}

/* Sleek WebGPU status badge */
.status-badge {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border-radius: var(--rounded-sm);
    font-size: 12px;
    font-weight: 500;
    font-family: var(--font-mono);
    border: 1px solid var(--color-hairline);
    background-color: var(--color-canvas);
    transition: var(--transition-studio);
}

.status-badge.accelerated {
    color: var(--color-cyan-deep);
    border-color: var(--color-cyan-soft);
    background-color: var(--color-cyan-soft);
}

.status-badge.fallback {
    color: var(--color-warning-deep);
    border-color: var(--color-warning-soft);
    background-color: var(--color-warning-soft);
}

.status-badge.info {
    color: var(--color-ink);
    border-color: var(--color-hairline-strong);
    background-color: var(--color-canvas-soft-2);
}



/* ==========================================================================
   APP MAIN GRID & CONTAINER
   ========================================================================== */
.app-container {
    max-width: 1400px;
    width: 100%;
    margin: 0 auto;
}

.app-workspace {
    display: grid;
    grid-template-columns: 360px 1fr;
    min-height: calc(100vh - 64px);
    background-color: var(--color-canvas-soft);
}

/* ==========================================================================
   SIDEBAR EDITOR CONTROLS (Left - Vercel themed)
   ========================================================================== */
.sidebar-panel {
    background-color: var(--color-canvas-soft);
    border-right: 1px solid var(--color-hairline);
    padding: 24px 24px 64px 24px; /* Increased bottom padding to guarantee comfortable scrolling past the end */
    display: flex;
    flex-direction: column;
    gap: 20px;
    overflow-y: auto;
    height: calc(100vh - 64px);
    position: sticky;
    top: 64px;
}

.panel-section {
    background-color: var(--color-canvas);
    border: 1px solid var(--color-hairline);
    border-radius: var(--rounded-md);
    overflow: hidden;
    box-shadow: 0px 1px 2px rgba(0, 0, 0, 0.02), 0px 4px 8px rgba(0, 0, 0, 0.02);
    transition: var(--transition-studio);
    flex-shrink: 0; /* CRITICAL: prevents layout engine from collapsing accordion headers under flex height bounds */
}

.panel-section:hover {
    box-shadow: 0px 1px 2px rgba(0, 0, 0, 0.03), 0px 8px 16px rgba(0, 0, 0, 0.03);
}

.section-title {
    font-family: var(--font-display);
    font-size: 14px;
    font-weight: 600;
    color: var(--color-ink);
    letter-spacing: -0.28px;
    padding: 16px 20px;
    cursor: pointer;
    background-color: var(--color-canvas);
    border-bottom: 1px solid transparent;
    display: flex;
    align-items: center;
    justify-content: space-between;
    user-select: none;
    transition: var(--transition-studio);
}

.section-title:after {
    content: "\f078";
    font-family: "Font Awesome 6 Free";
    font-weight: 900;
    font-size: 10px;
    color: var(--color-mute);
    transition: transform 0.2s ease;
}

.panel-section.active .section-title {
    border-bottom-color: var(--color-hairline);
}

.panel-section.active .section-title:after {
    transform: rotate(180deg);
}

.section-content {
    padding: 20px;
    display: none;
    flex-direction: column;
    gap: 16px;
}

.panel-section.active .section-content {
    display: flex;
}

/* ==========================================================================
   FORM INPUTS & CHROME
   ========================================================================== */
.control-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.control-group.half { width: 48%; }
.control-group.third { width: 30%; }

.flex-row {
    flex-direction: row;
    align-items: center;
    height: 100%;
}

label {
    font-family: var(--font-text);
    font-size: 12px;
    font-weight: 500;
    color: var(--color-body);
    letter-spacing: -0.1px;
}

.input-select {
    background-color: var(--color-canvas);
    border: 1px solid var(--color-hairline);
    border-radius: var(--rounded-sm);
    color: var(--color-ink);
    padding: 8px 12px;
    font-family: var(--font-text);
    font-size: 14px;
    outline: none;
    cursor: pointer;
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23888888' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'><polyline points='6 9 12 15 18 9'></polyline></svg>");
    background-repeat: no-repeat;
    background-position: right 10px center;
    background-size: 14px;
    padding-right: 32px;
    transition: var(--transition-studio);
}

.input-select:hover, .input-select:focus {
    border-color: var(--color-primary);
}

.input-textarea {
    background-color: var(--color-canvas);
    border: 1px solid var(--color-hairline);
    border-radius: var(--rounded-sm);
    color: var(--color-ink);
    padding: 10px 12px;
    font-family: var(--font-text);
    font-size: 14px;
    line-height: 1.4;
    min-height: 80px;
    resize: vertical;
    outline: none;
    transition: var(--transition-studio);
}

.input-textarea:hover, .input-textarea:focus {
    border-color: var(--color-primary);
}

.input-text {
    background-color: var(--color-canvas);
    border: 1px solid var(--color-hairline);
    border-radius: var(--rounded-sm);
    color: var(--color-ink);
    padding: 8px 12px;
    font-family: var(--font-text);
    font-size: 14px;
    outline: none;
    transition: var(--transition-studio);
}

.input-text:hover, .input-text:focus {
    border-color: var(--color-primary);
}

.input-desc {
    font-size: 11px;
    color: var(--color-mute);
    line-height: 1.35;
}

/* Prompt suggestion chips */
.prompt-suggestions {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 4px;
}

.btn-suggestion {
    background-color: var(--color-canvas-soft-2);
    border: 1px solid var(--color-hairline);
    border-radius: var(--rounded-full);
    color: var(--color-body);
    padding: 4px 10px;
    font-size: 11px;
    font-family: var(--font-text);
    font-weight: 400;
    cursor: pointer;
    transition: var(--transition-studio);
}

.btn-suggestion:hover {
    background-color: var(--color-canvas);
    border-color: var(--color-ink);
    color: var(--color-ink);
}

/* Vercel sleek slider controls */
.input-range {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 3px;
    border-radius: 2px;
    background: var(--color-hairline);
    outline: none;
}

.input-range::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--color-canvas);
    border: 1.5px solid var(--color-ink);
    cursor: pointer;
    box-shadow: 0 1px 2px rgba(0,0,0,0.1);
    transition: transform 0.1s ease;
}

.input-range::-webkit-slider-thumb:hover {
    transform: scale(1.15);
}

.parameters-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

/* Color input grids */
.control-color-picker {
    display: flex;
    flex-direction: column;
    gap: 4px;
    width: 32%;
}

.control-color-picker input[type="color"] {
    -webkit-appearance: none;
    border: none;
    width: 100%;
    height: 30px;
    cursor: pointer;
    background: transparent;
}

.control-color-picker input[type="color"]::-webkit-color-swatch-wrapper {
    padding: 0;
}

.control-color-picker input[type="color"]::-webkit-color-swatch {
    border: 1px solid var(--color-hairline);
    border-radius: var(--rounded-sm);
}

.layer-style-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
}

/* Checkbox toggle buttons */
.checkbox-container {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    cursor: pointer;
    user-select: none;
    color: var(--color-ink);
    font-weight: 500;
}

.checkbox-container input {
    cursor: pointer;
    accent-color: var(--color-ink);
}

/* Upload Presenter Graphic UI */
.file-upload-wrapper {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.btn-file-select {
    background-color: var(--color-canvas);
    border: 1px solid var(--color-hairline);
    border-radius: var(--rounded-sm);
    color: var(--color-ink);
    padding: 8px 12px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-studio);
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-file-select:hover {
    border-color: var(--color-ink);
    background-color: var(--color-canvas-soft-2);
}

.filename-text {
    font-size: 11px;
    color: var(--color-mute);
    text-align: center;
    text-overflow: ellipsis;
    overflow: hidden;
    white-space: nowrap;
}

/* ==========================================================================
   BUTTON GRAMMARS & MARK-UPS
   ========================================================================== */
/* Vercel Primary Button (Ink Stark Pill) */
.btn-primary {
    background-color: var(--color-primary);
    border: 1px solid var(--color-primary);
    border-radius: var(--rounded-pill);
    color: var(--color-on-primary);
    padding: 10px 24px;
    font-family: var(--font-text);
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-studio);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    outline: none;
}

.btn-primary:hover {
    background-color: var(--color-canvas);
    color: var(--color-ink);
}

.btn-primary:active {
    transform: scale(0.97);
}

/* Vercel Secondary Button (White Hairline Pill) */
.btn-secondary {
    background-color: var(--color-canvas);
    border: 1px solid var(--color-hairline);
    border-radius: var(--rounded-pill);
    color: var(--color-ink);
    padding: 10px 24px;
    font-family: var(--font-text);
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-studio);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn-secondary:hover {
    background-color: var(--color-canvas-soft-2);
    border-color: var(--color-hairline-strong);
}

.btn-secondary:active {
    transform: scale(0.97);
}

/* Smaller Scale In-App Buttons */
.btn-primary-sm {
    background-color: var(--color-primary);
    border: 1px solid var(--color-primary);
    border-radius: var(--rounded-pill);
    color: var(--color-on-primary);
    padding: 6px 14px;
    font-family: var(--font-text);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-studio);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    outline: none;
}

.btn-primary-sm:hover {
    background-color: var(--color-canvas);
    color: var(--color-ink);
}

.btn-generate {
    background-color: var(--color-primary);
    border: 1px solid var(--color-primary);
    border-radius: var(--rounded-sm);
    color: var(--color-on-primary);
    padding: 10px 20px;
    font-family: var(--font-text);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: var(--transition-studio);
}

.btn-generate:hover {
    background-color: var(--color-canvas);
    color: var(--color-ink);
}

.btn-generate:active {
    transform: scale(0.97);
}

/* ==========================================================================
   PROGRESS LOADING INDICATORS
   ========================================================================== */
.progress-container {
    background-color: var(--color-canvas-soft-2);
    border: 1px solid var(--color-hairline);
    border-radius: var(--rounded-sm);
    padding: 12px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.progress-container.hidden {
    display: none !important;
}

.progress-header {
    display: flex;
    justify-content: space-between;
    font-size: 11px;
    font-weight: 600;
    font-family: var(--font-mono);
}

#progress-status-text {
    color: var(--color-body);
}

#progress-percent-text {
    color: var(--color-link);
}

.progress-bar-track {
    background: #e4e4e7;
    height: 4px;
    border-radius: 2px;
    overflow: hidden;
}

.progress-bar-fill {
    background-color: var(--color-ink);
    height: 100%;
    width: 0%;
    transition: width 0.1s ease;
}

.progress-meta {
    font-size: 10px;
    color: var(--color-mute);
    line-height: 1.3;
    font-family: var(--font-mono);
}

/* ==========================================================================
   STYLE PRESET TEMPLATES GRID
   ========================================================================== */
.templates-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

.template-card {
    background-color: var(--color-canvas-soft-2);
    border: 1px solid var(--color-hairline);
    border-radius: var(--rounded-sm);
    padding: 8px;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    gap: 6px;
    transition: var(--transition-studio);
}

.template-card:hover {
    border-color: var(--color-hairline-strong);
    background-color: var(--color-canvas);
}

.template-card.active {
    border-color: var(--color-ink);
    background-color: var(--color-canvas);
    outline: 2px solid var(--color-ink);
}

.template-thumb {
    height: 50px;
    border-radius: 4px;
    background-size: cover;
    background-position: center;
    border: 1px solid var(--color-hairline);
}

.template-card span {
    font-size: 11px;
    font-weight: 600;
    text-align: center;
    color: var(--color-ink);
}

/* Grayscale fallback thumbnails to align with Stark Vercel style */
.tech-thumb { background: linear-gradient(135deg, #18181b, #3f3f46); }
.neon-thumb { background: linear-gradient(135deg, #09090b, #27272a, #71717a); }
.minimal-thumb { background: linear-gradient(135deg, #e4e4e7, #a1a1aa); }
.viral-thumb { background: linear-gradient(135deg, #27272a, #f4f4f5); }

/* ==========================================================================
   TEXT LAYERS ACCORDION CONTROL
   ========================================================================== */
.text-layer-control {
    background-color: var(--color-canvas);
    border: 1px solid var(--color-hairline);
    border-radius: var(--rounded-sm);
    overflow: hidden;
    margin-bottom: 8px;
    transition: var(--transition-studio);
}

.layer-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    background-color: var(--color-canvas-soft-2);
    border-bottom: 1px solid var(--color-hairline);
}

.layer-header h4 {
    font-size: 13px;
    font-weight: 600;
    color: var(--color-ink);
    letter-spacing: -0.2px;
}

.layer-switch {
    position: relative;
    display: inline-block;
    width: 28px;
    height: 16px;
}

.layer-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: #d4d4d8;
    transition: .2s;
}

.slider:before {
    position: absolute;
    content: "";
    height: 10px;
    width: 10px;
    left: 3px;
    bottom: 3px;
    background-color: #ffffff;
    transition: .2s;
}

.layer-switch input:checked + .slider {
    background-color: var(--color-ink);
}

.layer-switch input:checked + .slider:before {
    transform: translateX(12px);
}

.slider.round {
    border-radius: 8px;
}

.slider.round:before {
    border-radius: 50%;
}

.layer-body {
    padding: 12px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    background-color: var(--color-canvas);
}

/* ==========================================================================
   WORKSPACE VIEWPORT (Right - Parchment themed surface)
   ========================================================================== */
.canvas-workspace-panel {
    display: flex;
    flex-direction: column;
    padding: 32px;
    gap: 24px;
    background-color: var(--color-canvas-soft);
    overflow-y: auto;
    max-height: calc(100vh - 64px);
}

.workspace-header-bar {
    display: grid;
    grid-template-columns: 1fr 280px;
    gap: 16px;
    align-items: center;
}

/* Sleek Vercel styled cards */
.card-glass {
    background-color: var(--color-canvas);
    border: 1px solid var(--color-hairline);
    border-radius: var(--rounded-md);
    box-shadow: 0px 1px 2px rgba(0, 0, 0, 0.02), 0px 4px 8px rgba(0, 0, 0, 0.02);
    transition: var(--transition-studio);
}

.card-glass:hover {
    box-shadow: 0px 1px 2px rgba(0, 0, 0, 0.03), 0px 8px 16px rgba(0, 0, 0, 0.03);
}

/* ==========================================================================
   AUDIO KEEP-ALIVE exemption system
   ========================================================================== */
.keep-alive-controller {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 20px;
}

.keep-alive-title {
    display: flex;
    align-items: center;
    gap: 12px;
}

.audio-icon {
    font-size: 15px;
    color: var(--color-mute);
    transition: var(--transition-studio);
}

.audio-icon.active {
    color: var(--color-success);
}

.audio-meta {
    display: flex;
    flex-direction: column;
}

.audio-meta strong {
    font-family: var(--font-display);
    font-size: 13px;
    font-weight: 600;
    letter-spacing: -0.2px;
    color: var(--color-ink);
}

.audio-meta span {
    font-size: 11px;
    color: var(--color-mute);
}

.switch-toggle {
    position: relative;
    display: inline-block;
    width: 38px;
    height: 20px;
}

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

.slider-toggle {
    position: absolute;
    cursor: pointer;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: #d4d4d8;
    transition: .2s;
}

.slider-toggle:before {
    position: absolute;
    content: "";
    height: 14px;
    width: 14px;
    left: 3px;
    bottom: 3px;
    background-color: #ffffff;
    transition: .2s;
    box-shadow: 0 1px 2px rgba(0,0,0,0.15);
}

.switch-toggle input:checked + .slider-toggle {
    background-color: var(--color-ink);
}

.switch-toggle input:checked + .slider-toggle:before {
    transform: translateX(18px);
}

.slider-toggle.round {
    border-radius: 10px;
}

.slider-toggle.round:before {
    border-radius: 50%;
}

.keep-alive-badge {
    padding: 3px 8px;
    border-radius: var(--rounded-full);
    font-size: 10px;
    font-weight: 600;
    letter-spacing: 0.5px;
    font-family: var(--font-mono);
    border: 1px solid transparent;
}

.keep-alive-badge.active {
    background-color: var(--color-cyan-soft);
    color: var(--color-cyan-deep);
    border-color: var(--color-cyan);
}

.keep-alive-badge.standby {
    background-color: var(--color-canvas-soft-2);
    color: var(--color-mute);
    border-color: var(--color-hairline);
}

.aspect-selector {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 8px 16px;
}

.aspect-selector label {
    font-size: 11px;
}

.aspect-selector .input-select {
    padding: 5px 10px;
    font-size: 13px;
    border-radius: var(--rounded-sm);
}

/* ==========================================================================
   INTERACTIVE CANVASResting Surface Shadow
   ========================================================================== */
.canvas-view-container {
    display: flex;
    align-items: center;
    justify-content: center;
    flex: 1;
    min-height: 400px;
}

.canvas-frame {
    position: relative;
    border-radius: var(--rounded-md);
    overflow: hidden;
    /* Stacked shadow replacing singular Apple drop shadow */
    box-shadow: 
        0px 1px 2px rgba(0, 0, 0, 0.04), 
        0px 12px 24px rgba(0, 0, 0, 0.08), 
        0px 0px 0px 1px rgba(0, 0, 0, 0.08);
    border: 1px solid var(--color-hairline);
    background-color: #0c0a09;
    max-width: 100%;
    aspect-ratio: 16/9;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-studio);
}

.canvas-frame:hover {
    transform: translateY(-2px);
    box-shadow: 
        0px 2px 4px rgba(0, 0, 0, 0.04), 
        0px 16px 32px rgba(0, 0, 0, 0.1), 
        0px 0px 0px 1.5px rgba(0, 0, 0, 0.12);
}

.canvas-frame.portrait {
    aspect-ratio: 9/16;
    height: 100%;
    max-height: 520px;
}

.canvas-frame.square {
    aspect-ratio: 1/1;
    height: 100%;
    max-height: 520px;
}

#thumbnail-canvas {
    width: 100%;
    height: 100%;
    display: block;
    cursor: crosshair;
}

.canvas-overlay-hints {
    position: absolute;
    bottom: 12px;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--color-canvas);
    border: 1px solid var(--color-hairline);
    border-radius: var(--rounded-pill);
    padding: 6px 14px;
    font-size: 11px;
    font-weight: 500;
    color: var(--color-ink);
    display: flex;
    align-items: center;
    gap: 6px;
    pointer-events: none;
    opacity: 0.9;
    box-shadow: 0px 1px 2px rgba(0, 0, 0, 0.02), 0px 4px 8px rgba(0, 0, 0, 0.02);
    transition: var(--transition-studio);
}

.canvas-frame:hover .canvas-overlay-hints {
    opacity: 1;
}

/* ==========================================================================
   WORKSPACE ACTIONS ROW
   ========================================================================== */
.workspace-actions {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 12px;
}

/* ==========================================================================
   MODAL CONTROLLER (Pure stark white on glass backdrop)
   ========================================================================== */
.modal-backdrop {
    position: fixed;
    top: 0; left: 0; width: 100vw; height: 100vh;
    background-color: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 200;
    opacity: 1;
    transition: var(--transition-studio);
}

.modal-backdrop.hidden {
    opacity: 0;
    pointer-events: none;
}

.modal-container {
    max-width: 600px;
    width: 90%;
    background-color: var(--color-canvas);
    border: 1px solid var(--color-hairline);
    border-radius: var(--rounded-lg);
    /* Level 5 Stacked Modal shadow */
    box-shadow: 
        0px 1px 1px rgba(0, 0, 0, 0.05), 
        0px 12px 24px -4px rgba(0, 0, 0, 0.08), 
        0px 24px 48px -8px rgba(0, 0, 0, 0.12);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    animation: modalIn 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes modalIn {
    0% { transform: scale(0.97); opacity: 0; }
    100% { transform: scale(1); opacity: 1; }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 24px;
    border-bottom: 1px solid var(--color-hairline);
    background-color: var(--color-canvas-soft-2);
}

.modal-header h2 {
    font-family: var(--font-display);
    font-size: 18px;
    font-weight: 600;
    letter-spacing: -0.4px;
    color: var(--color-ink);
}

.modal-close {
    background: transparent;
    border: none;
    color: var(--color-mute);
    font-size: 22px;
    cursor: pointer;
    transition: var(--transition-studio);
}

.modal-close:hover {
    color: var(--color-ink);
}

.modal-body {
    padding: 24px;
    overflow-y: auto;
    max-height: 60vh;
    display: flex;
    flex-direction: column;
    gap: 16px;
    line-height: 1.55;
}

.modal-body h3 {
    font-family: var(--font-display);
    font-size: 14px;
    font-weight: 600;
    color: var(--color-ink);
    margin-top: 8px;
    letter-spacing: -0.2px;
}

.modal-body p {
    font-size: 14px;
    color: var(--color-body);
}

.modal-body ol {
    padding-left: 20px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.modal-body li strong {
    font-size: 14px;
    color: var(--color-ink);
}

.modal-body li p {
    margin-top: 2px;
}

.modal-note {
    display: flex;
    gap: 10px;
    padding: 14px;
    border-radius: var(--rounded-sm);
    font-size: 13px;
    line-height: 1.45;
}

.alert-note {
    background-color: var(--color-warning-soft);
    border: 1px solid rgba(245, 166, 35, 0.25);
    color: var(--color-warning-deep);
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    padding: 16px 24px;
    border-top: 1px solid var(--color-hairline);
    background-color: var(--color-canvas-soft-2);
}

/* ==========================================================================
   RESPONSIVE DESIGN ADAPTATIONS
   ========================================================================== */
@media (max-width: 1024px) {
    .app-workspace {
        grid-template-columns: 1fr;
        height: auto;
    }

    .sidebar-panel {
        border-right: none;
        border-bottom: 1px solid var(--color-hairline);
        max-height: none;
    }

    .canvas-workspace-panel {
        max-height: none;
    }
}

/* ==========================================================================
   VERCEL HIGH-IMPACT HERO SECTION (with mesh gradient background)
   ========================================================================== */
.hero-header-section {
    max-width: 1400px;
    width: 100%;
    margin: 0 auto;
    padding: 80px 24px 48px 24px;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    position: relative;
    /* Atmospheric multi-color mesh gradient backdrop stopping at top half */
    background-color: var(--color-canvas-soft);
    background-image: 
        radial-gradient(at 15% 20%, rgba(0, 124, 240, 0.08) 0px, transparent 45%),
        radial-gradient(at 85% 15%, rgba(0, 223, 216, 0.07) 0px, transparent 45%),
        radial-gradient(at 45% 75%, rgba(121, 40, 202, 0.08) 0px, transparent 40%),
        radial-gradient(at 75% 70%, rgba(255, 0, 128, 0.06) 0px, transparent 40%);
}

.hero-title {
    font-family: var(--font-display);
    font-size: 48px;
    font-weight: 600;
    line-height: 48px;
    letter-spacing: -2.4px; /* Aggressive Geist displays tracking */
    color: var(--color-ink);
}

.hero-tagline {
    font-family: var(--font-text);
    font-size: 16px;
    font-weight: 400;
    color: var(--color-body);
    max-width: 700px;
    line-height: 24px;
    margin-bottom: 8px;
}

.hero-actions-row {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 8px;
}

/* Vercel Pill Marketing CTAs */
.btn-primary-marketing {
    background-color: var(--color-primary);
    border: 1px solid var(--color-primary);
    border-radius: var(--rounded-pill);
    color: var(--color-on-primary);
    padding: 12px 32px;
    font-family: var(--font-text);
    font-size: 16px;
    font-weight: 500;
    text-decoration: none;
    transition: var(--transition-studio);
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.btn-primary-marketing:hover {
    background-color: var(--color-canvas-soft);
    color: var(--color-ink);
    box-shadow: 0px 8px 16px rgba(0, 0, 0, 0.05);
}

.btn-secondary-marketing {
    background-color: var(--color-canvas);
    border: 1px solid var(--color-hairline);
    border-radius: var(--rounded-pill);
    color: var(--color-ink);
    padding: 12px 32px;
    font-family: var(--font-text);
    font-size: 16px;
    font-weight: 500;
    text-decoration: none;
    transition: var(--transition-studio);
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.btn-secondary-marketing:hover {
    background-color: var(--color-canvas-soft-2);
    border-color: var(--color-hairline-strong);
}

.hero-links {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 24px;
    margin-top: 8px;
    flex-wrap: wrap;
}

.hero-link-item {
    font-family: var(--font-text);
    font-size: 13px;
    font-weight: 500;
    color: var(--color-mute);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: var(--transition-studio);
}

.hero-link-item:hover {
    color: var(--color-ink);
}

/* ==========================================================================
   SEO CONTENT CARD GRID
   ========================================================================== */
.seo-section {
    background-color: var(--color-canvas);
    border-top: 1px solid var(--color-hairline);
    border-bottom: 1px solid var(--color-hairline);
    padding: 80px 24px;
    width: 100%;
}

.seo-grid {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.seo-card {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.seo-card h2, .seo-card h3 {
    font-family: var(--font-display);
    font-size: 20px;
    font-weight: 600;
    line-height: 28px;
    letter-spacing: -0.6px;
    color: var(--color-ink);
}

.seo-card p {
    font-family: var(--font-text);
    font-size: 14px;
    font-weight: 400;
    color: var(--color-body);
    line-height: 1.6;
}

.seo-card strong {
    font-weight: 600;
    color: var(--color-ink);
}

@media (max-width: 768px) {
    .seo-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    .hero-title {
        font-size: 32px;
        line-height: 40px;
        letter-spacing: -1.28px;
    }
}

/* ==========================================================================
   INTERACTIVE FAQ ACCORDION
   ========================================================================== */
.faq-section {
    background-color: var(--color-canvas-soft);
    padding: 80px 24px;
    width: 100%;
}

.faq-section-title {
    font-family: var(--font-display);
    font-size: 32px;
    font-weight: 600;
    line-height: 40px;
    color: var(--color-ink);
    letter-spacing: -1.28px;
    text-align: center;
    margin-bottom: 40px;
}

.faq-accordion {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    background-color: var(--color-canvas);
    border: 1px solid var(--color-hairline);
    border-radius: var(--rounded-md);
    box-shadow: 0px 1px 2px rgba(0, 0, 0, 0.02), 0px 4px 8px rgba(0, 0, 0, 0.02);
    overflow: hidden;
}

.faq-item {
    border-bottom: 1px solid var(--color-hairline);
}

.faq-item:last-child {
    border-bottom: none;
}

.faq-question {
    width: 100%;
    background: transparent;
    border: none;
    font-family: var(--font-display);
    font-size: 16px;
    font-weight: 600;
    color: var(--color-ink);
    text-align: left;
    padding: 20px 24px;
    cursor: pointer;
    outline: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition-studio);
}

.faq-question:hover {
    background-color: var(--color-canvas-soft-2);
}

.faq-question:after {
    content: "\f078";
    font-family: "Font Awesome 6 Free";
    font-weight: 900;
    font-size: 11px;
    color: var(--color-mute);
    transition: transform 0.2s ease;
}

.faq-item.active .faq-question:after {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    background-color: var(--color-canvas);
}

.faq-answer p {
    padding: 0 24px 20px 24px;
    font-family: var(--font-text);
    font-size: 14px;
    color: var(--color-body);
    line-height: 1.6;
}

.faq-answer strong {
    font-weight: 600;
    color: var(--color-ink);
}

/* ==========================================================================
   VERCEL STARK FOOTER SYSTEM
   ========================================================================== */
.footer {
    background-color: var(--color-canvas);
    padding: 80px 24px 48px 24px;
    border-top: 1px solid var(--color-hairline);
    width: 100%;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 48px;
    border-bottom: 1px solid var(--color-hairline);
    padding-bottom: 40px;
}

.footer-column {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

/* Eyebrows in Vercel Monospace style */
.footer-column h4 {
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: 500;
    letter-spacing: 0.1em;
    color: var(--color-ink);
    text-transform: uppercase;
}

.dense-link {
    font-family: var(--font-text);
    font-size: 14px;
    font-weight: 400;
    color: var(--color-body);
    text-decoration: none;
    line-height: 1.4;
    transition: var(--transition-studio);
    cursor: pointer;
}

.dense-link:hover {
    color: var(--color-ink);
}

.footer-bottom {
    max-width: 1200px;
    margin: 24px auto 0 auto;
}

.legal-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-family: var(--font-text);
    font-size: 12px;
    color: var(--color-mute);
    flex-wrap: wrap;
    gap: 16px;
}

.legal-links {
    display: flex;
    align-items: center;
    gap: 16px;
}

.legal-links a {
    color: var(--color-mute);
    text-decoration: none;
    transition: var(--transition-studio);
}

.legal-links a:hover {
    color: var(--color-ink);
}

@media (max-width: 768px) {
    .footer-container {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    .legal-row {
        flex-direction: column;
        align-items: flex-start;
    }
}

/* ==========================================================================
   SUPPORT CONTACT SUCCESS ANIMATION FEEDBACK
   ========================================================================== */
.contact-success-msg {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px;
    border-radius: var(--rounded-sm);
    background-color: var(--color-cyan-soft);
    border: 1px solid var(--color-cyan);
    color: var(--color-cyan-deep);
    font-size: 13px;
    font-weight: 500;
    line-height: 1.45;
    margin-top: 16px;
    animation: fadeIn 0.25s ease-out;
}

.contact-success-msg.hidden {
    display: none !important;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}