/* ColloidNote — Luxury Minimal Design */
/* Refined elegance for a premium iPad app */

/* ============================================
   Design Tokens
   ============================================ */
:root {
    /* Colors - Refined dark palette */
    --color-bg: #1a1918;
    --color-bg-elevated: #242321;
    --color-bg-subtle: #1e1d1c;
    --color-surface: #2a2928;

    --color-text: #f5f4f0;
    --color-text-secondary: rgba(245, 244, 240, 0.6);
    --color-text-tertiary: rgba(245, 244, 240, 0.35);

    --color-accent: #c9714a;
    --color-accent-hover: #d88560;
    --color-accent-subtle: rgba(201, 113, 74, 0.15);

    --color-border: rgba(255, 255, 255, 0.08);
    --color-border-hover: rgba(255, 255, 255, 0.15);

    /* Canvas (dark mode rendering) */
    --canvas-bg: #262624;

    /* Typography */
    --font-display: 'Cormorant Garamond', Georgia, serif;
    --font-body: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;

    /* Spacing scale */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.5rem;
    --space-6: 2rem;
    --space-8: 3rem;
    --space-10: 4rem;
    --space-12: 5rem;
    --space-16: 8rem;

    /* Animation */
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
    --duration-fast: 150ms;
    --duration-normal: 300ms;
    --duration-slow: 500ms;

    /* Layout */
    --max-width: 1200px;
    --page-width: 810px;
    --page-height: 1080px;
}

/* ============================================
   Reset & Base
   ============================================ */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-body);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Grain overlay for texture */
.grain-overlay {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 1000;
    opacity: 0.03;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    position: relative;
    padding: var(--space-6);
}

.hero-content {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: var(--space-10) 0;
}

/* Prominent Logo */
.hero-logo {
    position: relative;
    margin-bottom: var(--space-8);
    opacity: 0;
    animation: logoReveal 1.2s var(--ease-out) 0.1s forwards;
}

.hero-logo-img {
    width: 140px;
    height: 140px;
    position: relative;
    z-index: 1;
    filter: drop-shadow(0 8px 32px rgba(201, 113, 74, 0.3));
}

.logo-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 200px;
    height: 200px;
    background: radial-gradient(circle, rgba(201, 113, 74, 0.2) 0%, transparent 70%);
    border-radius: 50%;
    animation: glowPulse 4s var(--ease-in-out) infinite;
}

.hero-title {
    font-family: var(--font-display);
    font-weight: 300;
    font-size: clamp(3rem, 12vw, 7rem);
    line-height: 0.95;
    letter-spacing: -0.03em;
    margin-bottom: var(--space-6);
}

.title-line {
    display: block;
    opacity: 0;
    animation: fadeSlideUp 1s var(--ease-out) forwards;
}

.title-line-1 {
    animation-delay: 0.2s;
}

.title-line-2 {
    animation-delay: 0.35s;
    color: var(--color-accent);
}

.hero-subtitle {
    font-family: var(--font-display);
    font-size: clamp(1rem, 2.5vw, 1.25rem);
    font-weight: 400;
    font-style: italic;
    color: var(--color-text-secondary);
    letter-spacing: 0.02em;
    opacity: 0;
    animation: fadeSlideUp 1s var(--ease-out) 0.5s forwards;
}

/* Scroll indicator */
.scroll-indicator {
    position: absolute;
    bottom: var(--space-8);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-3);
    opacity: 0;
    animation: fadeIn 1s var(--ease-out) 0.8s forwards;
}

.scroll-text {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--color-text-tertiary);
}

.scroll-line {
    width: 1px;
    height: 48px;
    background: linear-gradient(to bottom, var(--color-accent), transparent);
    animation: scrollPulse 2s var(--ease-in-out) infinite;
}

/* ============================================
   Demo Section
   ============================================ */
.demo-section {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding: var(--space-10) var(--space-6);
    padding-bottom: var(--space-16);
    background: var(--color-bg-subtle);
    position: relative;
}

.demo-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse 80% 50% at 50% 0%, var(--color-accent-subtle), transparent);
    pointer-events: none;
}

.demo-wrapper {
    width: 100%;
    max-width: var(--max-width);
    position: relative;
    z-index: 1;
}

.demo-header {
    text-align: center;
    margin-bottom: var(--space-10);
}

.demo-label {
    display: inline-block;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: var(--color-accent);
    margin-bottom: var(--space-4);
    padding: var(--space-2) var(--space-4);
    border: 1px solid var(--color-accent);
    border-radius: 100px;
}

.demo-title {
    font-family: var(--font-display);
    font-size: clamp(1.75rem, 5vw, 2.5rem);
    font-weight: 400;
    letter-spacing: -0.02em;
}

.demo-container {
    display: flex;
    flex-direction: column;
    align-items: center;
}

/* iPad Frame */
.ipad-frame {
    position: relative;
    background: #0c0c0b;
    border-radius: 24px;
    padding: 12px;
    box-shadow:
        0 0 0 1px rgba(255, 255, 255, 0.05),
        0 25px 80px -20px rgba(0, 0, 0, 0.5),
        0 50px 100px -40px rgba(201, 113, 74, 0.1);
    margin-bottom: var(--space-8);
}

.ipad-notch {
    position: absolute;
    top: 6px;
    left: 50%;
    transform: translateX(-50%);
    width: 8px;
    height: 8px;
    background: #1a1918;
    border-radius: 50%;
    opacity: 0.6;
}

.page-viewport {
    width: min(var(--page-width), 90vw);
    aspect-ratio: 810 / 1080;
    background: var(--canvas-bg);
    border-radius: 12px;
    overflow-y: auto;
    overflow-x: hidden;
    position: relative;
}

.page-viewport::-webkit-scrollbar {
    width: 6px;
}

.page-viewport::-webkit-scrollbar-track {
    background: transparent;
}

.page-viewport::-webkit-scrollbar-thumb {
    background: var(--color-accent);
    border-radius: 3px;
}

.page-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-4);
    color: var(--color-text-tertiary);
    background: var(--canvas-bg);
}

/* Empty state - subtle hint at bottom */
.page-placeholder.empty-canvas {
    justify-content: flex-end;
    padding-bottom: var(--space-8);
}

.placeholder-icon {
    width: 32px;
    height: 32px;
    opacity: 0.25;
}

.placeholder-icon svg {
    width: 100%;
    height: 100%;
}

.placeholder-text {
    font-family: var(--font-display);
    font-size: 0.875rem;
    font-style: italic;
    opacity: 0.5;
}

.pages-container {
    width: 100%;
    position: relative;
}

.pages-container img {
    display: block;
    width: 100%;
    height: auto;
    transition: opacity 200ms var(--ease-out);
}

/* Crossfade transition states */
.pages-container img.new-image {
    opacity: 0;
}

.pages-container img.fade-in {
    opacity: 1;
}

.pages-container img.fade-out {
    opacity: 0;
    position: absolute;
    top: 0;
    left: 0;
    pointer-events: none;
}

.pages-container.hidden,
.page-placeholder.hidden {
    display: none;
}

/* Demo Controls */
.demo-controls {
    width: 100%;
    max-width: 600px;
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.input-group {
    position: relative;
}

.demo-input {
    width: 100%;
    padding: var(--space-5) var(--space-6);
    font-family: var(--font-body);
    font-size: 1rem;
    color: var(--color-text);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    outline: none;
    transition: all var(--duration-normal) var(--ease-out);
}

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

.demo-input:focus {
    border-color: var(--color-accent);
    background: var(--color-bg-elevated);
}

.input-focus-ring {
    position: absolute;
    inset: -3px;
    border-radius: 15px;
    border: 2px solid var(--color-accent);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--duration-normal) var(--ease-out);
}

.demo-input:focus ~ .input-focus-ring {
    opacity: 0.3;
}

.button-group {
    display: flex;
    gap: var(--space-3);
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-4) var(--space-6);
    font-family: var(--font-body);
    font-size: 0.9rem;
    font-weight: 500;
    letter-spacing: 0.01em;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    overflow: hidden;
    transition: all var(--duration-normal) var(--ease-out);
}

.btn-content {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    position: relative;
    z-index: 1;
}

.btn-icon {
    width: 18px;
    height: 18px;
    transition: transform var(--duration-normal) var(--ease-out);
}

.btn-loader {
    display: none;
    width: 16px;
    height: 16px;
    border: 2px solid transparent;
    border-top-color: currentColor;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.btn-primary {
    background: var(--color-accent);
    color: var(--color-text);
    flex: 1;
    min-width: 120px;
}

.btn-primary:hover:not(:disabled) {
    background: var(--color-accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px -8px rgba(201, 113, 74, 0.4);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);
}

.btn-secondary {
    background: transparent;
    color: var(--color-accent);
    border: 1px solid var(--color-accent);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--color-accent);
    color: var(--color-text);
}

.btn-secondary:hover:not(:disabled) .btn-icon {
    transform: translateX(3px);
}

.btn-ghost {
    background: transparent;
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border);
}

.btn-ghost:hover:not(:disabled) {
    color: var(--color-text);
    border-color: var(--color-border-hover);
    background: rgba(255, 255, 255, 0.03);
}

.btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    transform: none !important;
}

.btn.hidden {
    display: none;
}

.btn.loading .btn-text {
    opacity: 0;
}

.btn.loading .btn-loader {
    display: block;
    position: absolute;
}

/* Instructions */
.demo-instructions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-4);
    margin-top: var(--space-6);
    font-size: 0.85rem;
    color: var(--color-text-tertiary);
}

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

.step-num {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    font-size: 0.7rem;
    font-weight: 600;
    background: var(--color-surface);
    border-radius: 50%;
    color: var(--color-text-secondary);
}

.step-divider {
    width: 24px;
    height: 1px;
    background: var(--color-border);
}

/* ============================================
   CTA Section
   ============================================ */
.cta-section {
    min-height: 60vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: var(--space-16) var(--space-6);
    background: var(--color-bg);
    position: relative;
}

.cta-wrapper {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.cta-content {
    text-align: center;
    max-width: 500px;
}

.cta-eyebrow {
    display: inline-block;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.25em;
    color: var(--color-accent);
    margin-bottom: var(--space-4);
}

.cta-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 6vw, 3rem);
    font-weight: 400;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-4);
}

.cta-description {
    font-size: 1rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: var(--space-8);
}

.cta-button {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-5) var(--space-8);
    font-family: var(--font-body);
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-text);
    text-decoration: none;
    border-radius: 100px;
    overflow: hidden;
    transition: transform var(--duration-normal) var(--ease-out);
}

.cta-button-bg {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--color-accent), #a85c3d);
    transition: opacity var(--duration-normal) var(--ease-out);
}

.cta-button::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--color-accent-hover), var(--color-accent));
    opacity: 0;
    transition: opacity var(--duration-normal) var(--ease-out);
}

.cta-button:hover {
    transform: translateY(-2px);
}

.cta-button:hover::before {
    opacity: 1;
}

.cta-button-content {
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.cta-icon {
    width: 20px;
    height: 20px;
}

/* Footer bottom */
.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--space-8);
    border-top: 1px solid var(--color-border);
    font-size: 0.75rem;
    color: var(--color-text-tertiary);
}

.footer-brand {
    font-family: var(--font-display);
    font-weight: 400;
    letter-spacing: 0.05em;
}

/* ============================================
   Animations
   ============================================ */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes fadeSlideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeSlideDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes scrollPulse {
    0%, 100% {
        opacity: 0.4;
        transform: scaleY(1);
    }
    50% {
        opacity: 1;
        transform: scaleY(1.1);
    }
}

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

@keyframes logoReveal {
    from {
        opacity: 0;
        transform: scale(0.8);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes glowPulse {
    0%, 100% {
        opacity: 0.5;
        transform: translate(-50%, -50%) scale(1);
    }
    50% {
        opacity: 0.8;
        transform: translate(-50%, -50%) scale(1.1);
    }
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 768px) {
    .hero {
        padding: var(--space-5);
    }

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

    .hero-logo-img {
        width: 100px;
        height: 100px;
    }

    .logo-glow {
        width: 140px;
        height: 140px;
    }

    .hero-title {
        font-size: clamp(2.5rem, 15vw, 4rem);
    }

    .scroll-indicator {
        display: none;
    }

    .demo-section {
        padding: var(--space-8) var(--space-4);
    }

    .ipad-frame {
        padding: 8px;
        border-radius: 16px;
    }

    .page-viewport {
        width: 100%;
        aspect-ratio: 810 / 1080;
        border-radius: 8px;
    }

    .demo-controls {
        padding: 0 var(--space-2);
    }

    .button-group {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }

    .demo-instructions {
        flex-direction: column;
        gap: var(--space-2);
    }

    .step-divider {
        display: none;
    }

    .cta-section {
        padding: var(--space-10) var(--space-5);
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2.25rem;
    }

    .demo-label {
        font-size: 0.65rem;
    }

    .demo-title {
        font-size: 1.5rem;
    }

    .demo-input {
        padding: var(--space-4) var(--space-5);
        font-size: 0.9rem;
    }
}

/* ============================================
   Rate Limit Modal
   ============================================ */
.rate-limit-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1001;
    animation: fadeIn 0.3s var(--ease-out);
}

.rate-limit-modal {
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    padding: var(--space-8);
    max-width: 400px;
    text-align: center;
    animation: fadeSlideUp 0.4s var(--ease-out);
}

.rate-limit-modal h3 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 400;
    margin-bottom: var(--space-4);
    color: var(--color-text);
}

.rate-limit-modal p {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-2);
    line-height: 1.6;
}

.rate-limit-modal p:last-of-type {
    margin-bottom: var(--space-6);
}

.rate-limit-cta {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-4) var(--space-8);
    background: var(--color-accent);
    color: var(--color-text);
    text-decoration: none;
    border-radius: 100px;
    font-weight: 500;
    transition: all var(--duration-normal) var(--ease-out);
}

.rate-limit-cta:hover {
    background: var(--color-accent-hover);
    transform: translateY(-2px);
}

/* ============================================
   Reduced Motion
   ============================================ */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    .scroll-line {
        animation: none;
    }
}