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

:root {
    --dark: #0D286D;
    --dark-light: #1a3a7a;
    --light: #ECEFF7;
    --light-card: #ffffff;
    --accent: #C4F068;
    --accent-hover: #d4ff78;
    --secondary: #6DA8F8;
    --text-dark: #0D286D;
    --text-light: #ffffff;
    --text-muted: rgba(255,255,255,0.7);
    --text-muted-dark: #5a6a8a;
    --radius: 16px;
    --radius-sm: 12px;
    --radius-xs: 8px;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--dark);
    color: var(--text-light);
    line-height: 1.6;
    font-size: 16px;
}

a {
    color: inherit;
    text-decoration: none;
}

/* Navigation */
header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--dark);
    z-index: 1000;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 32px;
    height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    font-weight: 700;
    font-size: 18px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon {
    width: 32px;
    height: 32px;
    background: var(--accent);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 24px;
}

.nav-links a {
    color: var(--text-muted);
    font-size: 14px;
    font-weight: 500;
    transition: color 0.2s;
}

.nav-links a:hover {
    color: var(--text-light);
}

.nav-cta {
    background: var(--accent);
    color: var(--dark);
    padding: 10px 20px;
    border-radius: var(--radius-xs);
    font-size: 14px;
    font-weight: 600;
    transition: background 0.2s;
}

.nav-cta:hover {
    background: var(--accent-hover);
}

/* Sections */
.section-dark {
    background: var(--dark);
    color: var(--text-light);
}

.section-light {
    background: var(--light);
    color: var(--text-dark);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 32px;
}

/* Hero */
.hero {
    padding: 160px 0 100px;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-eyebrow {
    color: var(--text-muted);
    font-size: 13px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 20px;
}

.hero h1 {
    font-size: clamp(36px, 5vw, 52px);
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.02em;
    margin-bottom: 24px;
}

.hero-text {
    font-size: 17px;
    color: var(--text-muted);
    line-height: 1.7;
    margin-bottom: 32px;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--accent);
    color: var(--dark);
    padding: 14px 28px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 15px;
    transition: all 0.2s;
    border: none;
    cursor: pointer;
}

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
}

.hero-image {
    background: linear-gradient(135deg, var(--secondary) 0%, var(--dark-light) 100%);
    border-radius: var(--radius);
    height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 120px;
}

/* Section Header */
.section-header {
    text-align: center;
    margin-bottom: 48px;
}

.section-header h2 {
    font-size: clamp(28px, 4vw, 38px);
    font-weight: 700;
    letter-spacing: -0.02em;
}

.section-header p {
    color: var(--text-muted);
    font-size: 16px;
    margin-top: 12px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.section-light .section-header p {
    color: var(--text-muted-dark);
}

.section-eyebrow {
    color: var(--accent);
    font-size: 13px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 16px;
}

.section-light .section-eyebrow {
    color: var(--secondary);
}

/* Section Padding */
.section-padding {
    padding: 80px 0;
}

/* Cards Grid */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 24px;
}

.cards-grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

/* Prompt Card */
.prompt-card {
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: var(--radius);
    padding: 28px;
    display: flex;
    flex-direction: column;
}

.section-light .prompt-card {
    background: var(--light-card);
    border: 1px solid rgba(13, 40, 109, 0.1);
    box-shadow: 0 4px 20px rgba(13, 40, 109, 0.08);
}

.card-tag {
    display: inline-block;
    color: var(--accent);
    font-size: 12px;
    font-weight: 600;
    margin-bottom: 16px;
    letter-spacing: 0.02em;
}

.section-light .card-tag {
    color: var(--secondary);
}

.prompt-card h3 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 8px;
}

.prompt-card .description {
    color: var(--text-muted);
    font-size: 14px;
    line-height: 1.6;
    margin-bottom: 20px;
}

.section-light .prompt-card .description {
    color: var(--text-muted-dark);
}

/* Prompt Box */
.prompt-box {
    background: var(--dark);
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: var(--radius-sm);
    padding: 20px;
    position: relative;
    margin-bottom: 16px;
    flex-grow: 1;
}

.section-light .prompt-box {
    background: var(--light);
    border: 1px solid rgba(13, 40, 109, 0.15);
}

.prompt-box pre {
    font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
    font-size: 12px;
    line-height: 1.7;
    color: var(--text-muted);
    white-space: pre-wrap;
    word-break: break-word;
    margin: 0;
    padding-right: 70px;
}

.section-light .prompt-box pre {
    color: var(--text-muted-dark);
}

.copy-btn {
    position: absolute;
    top: 14px;
    right: 14px;
    background: var(--accent);
    border: none;
    color: var(--dark);
    padding: 8px 14px;
    border-radius: var(--radius-xs);
    font-family: 'Inter', sans-serif;
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.copy-btn:hover {
    background: var(--accent-hover);
    transform: scale(1.05);
}

/* Tip Box */
.tip-box {
    background: rgba(196, 240, 104, 0.1);
    border-radius: var(--radius-xs);
    padding: 14px 16px;
    margin-top: auto;
}

.tip-label {
    color: var(--accent);
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 6px;
}

.tip-box p {
    color: var(--text-muted);
    font-size: 13px;
    line-height: 1.5;
    margin: 0;
}

.section-light .tip-box {
    background: rgba(109, 168, 248, 0.1);
}

.section-light .tip-label {
    color: var(--secondary);
}

.section-light .tip-box p {
    color: var(--text-muted-dark);
}

/* Category Navigation */
.category-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
    margin-bottom: 48px;
}

.category-btn {
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.15);
    color: var(--text-muted);
    padding: 10px 20px;
    border-radius: 50px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.category-btn:hover,
.category-btn.active {
    background: var(--accent);
    border-color: var(--accent);
    color: var(--dark);
}

/* Checklist */
.checklist-card {
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: var(--radius);
    padding: 40px;
    max-width: 700px;
    margin: 0 auto;
}

.checklist-card h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 28px;
}

.interactive-checklist {
    list-style: none;
}

.interactive-checklist li {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 16px 0;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    cursor: pointer;
    transition: opacity 0.2s;
}

.interactive-checklist li:last-child {
    border-bottom: none;
}

.interactive-checklist li.checked {
    opacity: 0.4;
}

.interactive-checklist li.checked .check-text {
    text-decoration: line-through;
}

.checkbox {
    width: 24px;
    height: 24px;
    border: 2px solid rgba(255,255,255,0.3);
    border-radius: 6px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    margin-top: 1px;
}

.interactive-checklist li.checked .checkbox {
    background: var(--accent);
    border-color: var(--accent);
}

.checkbox::after {
    content: '✓';
    color: var(--dark);
    font-size: 14px;
    font-weight: 700;
    opacity: 0;
}

.interactive-checklist li.checked .checkbox::after {
    opacity: 1;
}

.check-text {
    color: var(--text-muted);
    font-size: 15px;
    line-height: 1.5;
}

.check-text strong {
    color: var(--text-light);
    font-weight: 600;
}

/* Tips Grid */
.tips-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.tip-card {
    background: var(--light-card);
    border: 1px solid rgba(13, 40, 109, 0.1);
    border-radius: var(--radius-sm);
    padding: 28px;
    box-shadow: 0 4px 20px rgba(13, 40, 109, 0.08);
}

.tip-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--accent);
    color: var(--dark);
    font-weight: 800;
    font-size: 16px;
    border-radius: var(--radius-xs);
    margin-bottom: 20px;
}

.tip-card h4 {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 10px;
}

.tip-card p {
    color: var(--text-muted-dark);
    font-size: 14px;
    line-height: 1.6;
    margin: 0;
}

/* Warning Section */
.warning-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    max-width: 900px;
    margin: 0 auto;
}

.warning-box {
    background: rgba(251, 146, 60, 0.1);
    border: 1px solid rgba(251, 146, 60, 0.2);
    border-radius: var(--radius);
    padding: 28px;
}

.warning-box h4 {
    color: #fb923c;
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 16px;
}

.warning-box p {
    color: var(--text-muted);
    font-size: 14px;
    margin-bottom: 16px;
}

.warning-box p strong {
    color: var(--text-light);
}

.warning-list {
    list-style: none;
}

.warning-list li {
    color: var(--text-muted);
    font-size: 13px;
    padding: 5px 0 5px 20px;
    position: relative;
}

.warning-list li::before {
    content: '×';
    position: absolute;
    left: 0;
    color: #fb923c;
    font-weight: 700;
}

.ok-box {
    background: rgba(196, 240, 104, 0.1);
    border: 1px solid rgba(196, 240, 104, 0.2);
    border-radius: var(--radius);
    padding: 28px;
}

.ok-box h4 {
    color: var(--accent);
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 16px;
}

.ok-list {
    list-style: none;
}

.ok-list li {
    color: var(--text-muted);
    font-size: 13px;
    padding: 5px 0 5px 20px;
    position: relative;
}

.ok-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--accent);
    font-weight: 700;
}

/* CTA Section */
.cta-section {
    text-align: center;
    padding: 80px 0;
}

.cta-section h2 {
    font-size: clamp(26px, 4vw, 34px);
    font-weight: 700;
    margin-bottom: 16px;
}

.cta-section p {
    color: var(--text-muted);
    font-size: 16px;
    margin-bottom: 32px;
}

/* Footer */
footer {
    background: var(--dark);
    border-top: 1px solid rgba(255,255,255,0.1);
    padding: 48px 32px;
    text-align: center;
}

.footer-content {
    max-width: 400px;
    margin: 0 auto;
}

.footer-logo {
    font-weight: 700;
    font-size: 18px;
    margin-bottom: 8px;
}

.footer-role {
    color: var(--text-muted);
    font-size: 14px;
    margin-bottom: 24px;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 24px;
    margin-bottom: 32px;
}

.footer-links a {
    color: var(--text-muted);
    font-size: 14px;
    font-weight: 500;
    transition: color 0.2s;
}

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

.footer-event {
    color: var(--text-muted);
    font-size: 12px;
    padding-top: 24px;
    border-top: 1px solid rgba(255,255,255,0.1);
    line-height: 1.7;
}

/* Scroll to Top */
.scroll-top {
    position: fixed;
    bottom: 24px;
    right: 24px;
    width: 48px;
    height: 48px;
    background: var(--accent);
    border: none;
    border-radius: var(--radius-sm);
    color: var(--dark);
    font-size: 20px;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.scroll-top.visible {
    opacity: 1;
    visibility: visible;
}

.scroll-top:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(196, 240, 104, 0.3);
}

/* Responsive */
@media (max-width: 1024px) {
    .cards-grid-3,
    .tips-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    nav {
        padding: 0 20px;
    }

    .nav-links {
        display: none;
    }

    .hero {
        padding: 120px 0 60px;
    }

    .hero-grid,
    .cards-grid,
    .cards-grid-3,
    .tips-grid,
    .warning-grid {
        grid-template-columns: 1fr;
    }

    .hero-image {
        height: 250px;
        font-size: 80px;
    }

    .container {
        padding: 0 20px;
    }

    .section-padding {
        padding: 60px 0;
    }

    .prompt-box pre {
        padding-right: 0;
        padding-top: 45px;
    }

    .copy-btn {
        top: 12px;
        right: 12px;
    }

    .category-nav {
        justify-content: flex-start;
        overflow-x: auto;
        flex-wrap: nowrap;
        padding-bottom: 10px;
    }

    .category-btn {
        flex-shrink: 0;
    }
}