/* ===== Design Tokens ===== */
:root {
    --color-bg: #0a0a12;
    --color-surface: #12121e;
    --color-surface-hover: #1a1a2e;
    --color-surface-elevated: #16162a;
    --color-border: rgba(255, 255, 255, 0.06);
    --color-border-hover: rgba(255, 255, 255, 0.12);
    --color-text: #e8e8f0;
    --color-text-secondary: #8888a0;
    --color-text-muted: #55556a;
    --color-accent: #6c63ff;
    --color-accent-light: #8b83ff;
    --color-accent-glow: rgba(108, 99, 255, 0.15);
    --color-accent-glow-strong: rgba(108, 99, 255, 0.3);
    --color-success: #34d399;
    --color-warning: #fbbf24;
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.2);
    --shadow-md: 0 4px 24px rgba(0,0,0,0.3);
    --shadow-lg: 0 8px 48px rgba(0,0,0,0.4);
    --shadow-glow: 0 0 60px rgba(108, 99, 255, 0.1);
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

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

a {
    color: var(--color-accent-light);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: #a9a3ff;
}

/* ===== Ambient Background ===== */
.ambient-bg {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    overflow: hidden;
}

.blob {
    position: absolute;
    border-radius: 50%;
    filter: blur(120px);
    opacity: 0.4;
    animation: blobFloat 20s ease-in-out infinite;
}

.blob-1 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(108, 99, 255, 0.3), transparent 70%);
    top: -10%;
    left: -5%;
    animation-delay: 0s;
}

.blob-2 {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(139, 92, 246, 0.2), transparent 70%);
    top: 40%;
    right: -10%;
    animation-delay: -7s;
}

.blob-3 {
    width: 350px;
    height: 350px;
    background: radial-gradient(circle, rgba(59, 130, 246, 0.2), transparent 70%);
    bottom: -5%;
    left: 30%;
    animation-delay: -14s;
}

@keyframes blobFloat {
    0%, 100% { transform: translate(0, 0) scale(1); }
    25% { transform: translate(30px, -40px) scale(1.05); }
    50% { transform: translate(-20px, 20px) scale(0.95); }
    75% { transform: translate(10px, 30px) scale(1.02); }
}

/* ===== Header ===== */
header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(10, 10, 18, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
}

.header-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--color-text);
    font-weight: 700;
    font-size: 1.1rem;
    letter-spacing: -0.02em;
    text-decoration: none;
}

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

.logo svg {
    color: var(--color-accent);
}

#main-nav {
    display: flex;
    gap: 8px;
}

.nav-link {
    padding: 6px 14px;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
}

.nav-link:hover {
    color: var(--color-text);
    background: var(--color-surface-hover);
}

/* ===== Hero ===== */
.hero {
    padding: 140px 24px 40px;
    text-align: center;
    position: relative;
    z-index: 1;
}

.hero-content {
    max-width: 700px;
    margin: 0 auto;
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 16px;
    background: var(--color-accent-glow);
    border: 1px solid rgba(108, 99, 255, 0.2);
    border-radius: 100px;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--color-accent-light);
    margin-bottom: 24px;
    animation: fadeInUp 0.6s ease-out;
}

h1 {
    font-size: clamp(2rem, 5vw, 3.2rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.15;
    margin-bottom: 20px;
    animation: fadeInUp 0.6s ease-out 0.1s both;
}

.gradient-text {
    background: linear-gradient(135deg, var(--color-accent) 0%, #a78bfa 50%, #818cf8 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    max-width: 560px;
    margin: 0 auto;
    line-height: 1.7;
    animation: fadeInUp 0.6s ease-out 0.2s both;
}

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

/* ===== Tool Section ===== */
.tool-section {
    padding: 20px 24px 80px;
    position: relative;
    z-index: 1;
}

.tool-card {
    max-width: 720px;
    margin: 0 auto;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: 32px;
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    animation: fadeInUp 0.6s ease-out 0.3s both;
}

/* ===== Steps Indicator ===== */
.steps-indicator {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0;
    margin-bottom: 32px;
}

.step {
    display: flex;
    align-items: center;
    gap: 8px;
    opacity: 0.35;
    transition: opacity var(--transition-base);
}

.step.active {
    opacity: 1;
}

.step.completed {
    opacity: 0.7;
}

.step-number {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--color-surface-hover);
    border: 1.5px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 700;
    transition: all var(--transition-base);
}

.step.active .step-number {
    background: var(--color-accent);
    border-color: var(--color-accent);
    color: #fff;
    box-shadow: 0 0 16px var(--color-accent-glow-strong);
}

.step.completed .step-number {
    background: var(--color-success);
    border-color: var(--color-success);
    color: #fff;
}

.step span {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--color-text-secondary);
}

.step.active span {
    color: var(--color-text);
}

.step-divider {
    width: 40px;
    height: 1px;
    background: var(--color-border);
    margin: 0 12px;
}

/* ===== Upload Area ===== */
.upload-area {
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-lg);
    padding: 60px 40px;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    background: transparent;
}

.upload-area:hover {
    border-color: var(--color-accent);
    background: var(--color-accent-glow);
}

.upload-area.drag-over {
    border-color: var(--color-accent);
    background: var(--color-accent-glow);
    transform: scale(1.01);
}

.upload-icon {
    color: var(--color-text-muted);
    margin-bottom: 16px;
    transition: color var(--transition-base);
}

.upload-area:hover .upload-icon {
    color: var(--color-accent);
}

.upload-area h3 {
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--color-text);
}

.upload-area p {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    margin-bottom: 12px;
}

.upload-hint {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    display: inline-block;
    padding: 4px 12px;
    background: rgba(255,255,255,0.03);
    border-radius: 100px;
}

/* ===== Canvas Container ===== */
.canvas-container {
    position: relative;
    text-align: center;
    margin-bottom: 24px;
    animation: fadeInUp 0.4s ease-out;
}

.canvas-container canvas {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
}

.canvas-badge {
    position: absolute;
    top: 12px;
    right: 12px;
    background: rgba(0,0,0,0.7);
    backdrop-filter: blur(8px);
    padding: 4px 10px;
    border-radius: var(--radius-sm);
    font-size: 0.7rem;
    font-weight: 600;
    color: rgba(255,255,255,0.8);
}

/* ===== Controls ===== */
.controls {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 16px;
    animation: fadeInUp 0.4s ease-out 0.1s both;
}

/* Custom Toggle */
.toggle-control {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    user-select: none;
}

.toggle-control input {
    display: none;
}

.toggle-track {
    width: 40px;
    height: 22px;
    border-radius: 100px;
    background: var(--color-surface-hover);
    border: 1.5px solid var(--color-border);
    position: relative;
    transition: all var(--transition-base);
}

.toggle-thumb {
    position: absolute;
    top: 2px;
    left: 2px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--color-text-muted);
    transition: all var(--transition-base);
}

.toggle-control input:checked ~ .toggle-track {
    background: var(--color-accent);
    border-color: var(--color-accent);
}

.toggle-control input:checked ~ .toggle-track .toggle-thumb {
    left: 20px;
    background: #fff;
}

.toggle-label-text {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-text-secondary);
}

/* Buttons */
.control-actions {
    display: flex;
    gap: 10px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 600;
    font-family: var(--font-family);
    cursor: pointer;
    border: none;
    transition: all var(--transition-fast);
}

.btn-primary {
    background: var(--color-accent);
    color: #fff;
    box-shadow: 0 4px 16px rgba(108, 99, 255, 0.3);
}

.btn-primary:hover {
    background: var(--color-accent-light);
    box-shadow: 0 4px 24px rgba(108, 99, 255, 0.4);
    transform: translateY(-1px);
}

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

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

.btn-secondary:hover {
    background: rgba(255,255,255,0.08);
    color: var(--color-text);
    border-color: var(--color-border-hover);
}

/* ===== How It Works ===== */
.how-it-works {
    padding: 80px 24px;
    position: relative;
    z-index: 1;
}

.how-it-works h2, .faq-section h2, .print-section h2 {
    text-align: center;
    font-size: clamp(1.5rem, 3vw, 2.2rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    margin-bottom: 16px;
}

.section-subtitle {
    text-align: center;
    color: var(--color-text-secondary);
    font-size: 1rem;
    margin-bottom: 48px;
}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    max-width: 1000px;
    margin: 48px auto 0;
}

.step-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 32px 24px;
    position: relative;
    transition: all var(--transition-base);
}

.step-card:hover {
    border-color: var(--color-border-hover);
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.step-card-number {
    font-size: 3rem;
    font-weight: 900;
    color: var(--color-surface-hover);
    position: absolute;
    top: 16px;
    right: 20px;
    line-height: 1;
    letter-spacing: -0.04em;
}

.step-card-icon {
    width: 52px;
    height: 52px;
    border-radius: var(--radius-md);
    background: var(--color-accent-glow);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-accent-light);
    margin-bottom: 20px;
}

.step-card h3 {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 10px;
    letter-spacing: -0.01em;
}

.step-card p {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* ===== Print Section ===== */
.print-section {
    padding: 80px 24px;
    position: relative;
    z-index: 1;
}

.print-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    max-width: 900px;
    margin: 48px auto 0;
}

.print-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 28px 20px;
    text-align: center;
    text-decoration: none;
    transition: all var(--transition-base);
}

.print-card:hover {
    border-color: var(--color-accent);
    transform: translateY(-4px);
    box-shadow: var(--shadow-md), 0 0 24px var(--color-accent-glow);
    color: var(--color-text);
}

.print-card-icon {
    font-size: 2rem;
    margin-bottom: 12px;
}

.print-card h3 {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 6px;
}

.print-card p {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

/* ===== FAQ Section ===== */
.faq-section {
    padding: 80px 24px 100px;
    position: relative;
    z-index: 1;
}

.faq-grid {
    max-width: 700px;
    margin: 48px auto 0;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.faq-item {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: all var(--transition-base);
}

.faq-item:hover {
    border-color: var(--color-border-hover);
}

.faq-item[open] {
    border-color: rgba(108, 99, 255, 0.2);
    box-shadow: 0 0 16px var(--color-accent-glow);
}

.faq-item summary {
    padding: 18px 24px;
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 600;
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: color var(--transition-fast);
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-item summary::after {
    content: '+';
    font-size: 1.2rem;
    font-weight: 400;
    color: var(--color-text-muted);
    transition: transform var(--transition-base);
    flex-shrink: 0;
    margin-left: 16px;
}

.faq-item[open] summary::after {
    content: '−';
    color: var(--color-accent);
}

.faq-item summary:hover {
    color: var(--color-accent-light);
}

.faq-answer {
    padding: 0 24px 20px;
    animation: faqOpen 0.3s ease-out;
}

.faq-answer p {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

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

/* ===== Footer ===== */
footer {
    position: relative;
    z-index: 1;
    border-top: 1px solid var(--color-border);
    background: rgba(10, 10, 18, 0.6);
    backdrop-filter: blur(12px);
}

.footer-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 40px 24px;
    text-align: center;
}

.footer-brand {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    color: var(--color-text);
    font-weight: 700;
    font-size: 1rem;
    margin-bottom: 12px;
}

.footer-brand svg {
    color: var(--color-accent);
}

.footer-note {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-bottom: 20px;
    line-height: 1.6;
}

.footer-links {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    flex-wrap: wrap;
}

.footer-links a {
    font-size: 0.8rem;
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--color-accent-light);
}

.footer-divider {
    color: var(--color-text-muted);
    font-size: 0.8rem;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .steps-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

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

    .steps-indicator {
        flex-wrap: wrap;
        gap: 8px;
    }

    .step-divider {
        display: none;
    }

    .step span {
        display: none;
    }

    .controls {
        flex-direction: column;
        align-items: stretch;
    }

    .control-actions {
        justify-content: stretch;
    }

    .control-actions .btn {
        flex: 1;
        justify-content: center;
    }

    .tool-card {
        padding: 20px;
    }

    .upload-area {
        padding: 40px 20px;
    }

    #main-nav {
        display: none;
    }
}

@media (max-width: 480px) {
    .print-grid {
        grid-template-columns: 1fr;
    }

    h1 {
        font-size: 1.8rem;
    }

    .hero {
        padding-top: 110px;
    }
}