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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: #e6edf3;
    background: #0d1117;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 24px;
}

a {
    color: #58a6ff;
    text-decoration: none;
    transition: color 0.2s;
}

a:hover {
    color: #79c0ff;
}

code {
    font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
    background: rgba(110, 118, 129, 0.2);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.9em;
    color: #ff7b72;
}

/* ===== Hero ===== */
.hero {
    position: relative;
    min-height: 90vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    overflow: hidden;
    padding: 80px 24px;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 80% 60% at 50% -20%, rgba(102, 126, 234, 0.25), transparent),
        radial-gradient(ellipse 60% 50% at 80% 50%, rgba(118, 75, 162, 0.15), transparent),
        radial-gradient(ellipse 60% 50% at 20% 80%, rgba(56, 189, 248, 0.08), transparent);
    z-index: 0;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 780px;
}

.hero-badge {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(102, 126, 234, 0.15);
    border: 1px solid rgba(102, 126, 234, 0.3);
    border-radius: 100px;
    font-size: 0.85em;
    font-weight: 600;
    color: #a5b4fc;
    letter-spacing: 0.5px;
    margin-bottom: 24px;
    text-transform: uppercase;
}

.hero h1 {
    font-size: clamp(2.8em, 7vw, 5em);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 24px;
    color: #f0f6fc;
}

.gradient-text {
    background: linear-gradient(135deg, #667eea 0%, #a78bfa 40%, #f472b6 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: clamp(1.05em, 2vw, 1.25em);
    color: #8b949e;
    line-height: 1.7;
    margin-bottom: 40px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-subtitle em {
    color: #c9d1d9;
    font-style: normal;
    font-weight: 600;
}

.hero-cta {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ===== Buttons ===== */
.btn {
    display: inline-block;
    padding: 14px 28px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 1em;
    text-decoration: none;
    transition: all 0.2s;
    cursor: pointer;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: #fff;
    border: none;
}

.btn-primary:hover {
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(102, 126, 234, 0.35);
}

.btn-secondary {
    background: transparent;
    color: #c9d1d9;
    border: 1px solid #30363d;
}

.btn-secondary:hover {
    color: #f0f6fc;
    border-color: #58a6ff;
    background: rgba(88, 166, 255, 0.06);
}

/* ===== Myth Buster ===== */
.myth-section {
    padding: 0 24px;
    margin-top: -60px;
    position: relative;
    z-index: 2;
}

.myth-card {
    display: flex;
    align-items: flex-start;
    gap: 24px;
    background: #161b22;
    border: 1px solid #30363d;
    border-left: 4px solid #f0883e;
    border-radius: 12px;
    padding: 32px;
    max-width: 1140px;
    margin: 0 auto;
}

.myth-icon {
    font-size: 2em;
    flex-shrink: 0;
}

.myth-content h2 {
    font-size: 1.3em;
    color: #f0883e;
    margin-bottom: 8px;
}

.myth-content p {
    color: #c9d1d9;
    font-size: 1.05em;
    line-height: 1.7;
}

/* ===== Sections ===== */
.section-dark {
    padding: 100px 0;
}

.section-gradient {
    padding: 100px 0;
    background: linear-gradient(180deg, #0d1117 0%, #111827 50%, #0d1117 100%);
}

.section-light {
    padding: 80px 0;
    background: #161b22;
}

.section-title {
    font-size: clamp(1.8em, 4vw, 2.5em);
    font-weight: 800;
    color: #f0f6fc;
    text-align: center;
    margin-bottom: 12px;
}

.section-title.light {
    color: #f0f6fc;
}

.section-title.dark {
    color: #f0f6fc;
}

.section-subtitle {
    text-align: center;
    color: #8b949e;
    font-size: 1.1em;
    margin-bottom: 56px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.section-subtitle.light {
    color: #9ca3af;
}

.subsection-title {
    font-size: 1.8em;
    font-weight: 700;
    color: #f0f6fc;
    text-align: center;
    margin-top: 80px;
    margin-bottom: 12px;
}

/* ===== Feature Highlights (alternating layout) ===== */
.feature-highlight {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
    margin-bottom: 80px;
}

.feature-highlight.reverse {
    direction: rtl;
}

.feature-highlight.reverse > * {
    direction: ltr;
}

.feature-tag {
    display: inline-block;
    padding: 4px 12px;
    background: rgba(102, 126, 234, 0.12);
    border: 1px solid rgba(102, 126, 234, 0.25);
    border-radius: 100px;
    font-size: 0.8em;
    font-weight: 600;
    color: #a5b4fc;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 16px;
}

.feature-highlight-content h3 {
    font-size: 1.8em;
    font-weight: 700;
    color: #f0f6fc;
    margin-bottom: 16px;
}

.feature-highlight-content p {
    color: #8b949e;
    font-size: 1.05em;
    line-height: 1.7;
    margin-bottom: 20px;
}

.feature-list {
    list-style: none;
    margin-bottom: 24px;
}

.feature-list li {
    padding: 6px 0;
    padding-left: 24px;
    position: relative;
    color: #c9d1d9;
    font-size: 0.95em;
}

.feature-list li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: #667eea;
    font-weight: 700;
}

.link-arrow {
    display: inline-block;
    color: #58a6ff;
    font-weight: 600;
    font-size: 0.95em;
    transition: all 0.2s;
    margin-right: 16px;
}

.link-arrow:hover {
    color: #79c0ff;
    transform: translateX(4px);
}

.link-secondary {
    color: #8b949e;
    font-weight: 500;
}

.link-secondary:hover {
    color: #c9d1d9;
}

/* ===== Terminal Window ===== */
.terminal-window {
    background: #161b22;
    border: 1px solid #30363d;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.4);
}

.terminal-header {
    display: flex;
    align-items: center;
    padding: 12px 16px;
    background: #0d1117;
    border-bottom: 1px solid #30363d;
    gap: 8px;
}

.terminal-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.terminal-dot.red { background: #ff5f57; }
.terminal-dot.yellow { background: #febc2e; }
.terminal-dot.green { background: #28c840; }

.terminal-title {
    margin-left: 8px;
    font-size: 0.8em;
    color: #8b949e;
    font-family: 'SFMono-Regular', Consolas, monospace;
}

.terminal-body {
    padding: 20px;
    font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
    font-size: 0.85em;
    line-height: 1.9;
}

.terminal-body p {
    margin: 0;
}

.terminal-body.code-block {
    line-height: 1.8;
}

.t-prompt { color: #3fb950; font-weight: 700; }
.t-cmd { color: #79c0ff; }
.t-string { color: #a5d6ff; }
.t-comment { color: #6e7681; }
.t-success { color: #3fb950; }
.t-keyword { color: #ff7b72; }

/* ===== IDE Grid ===== */
.ide-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
    margin-top: 40px;
}

.ide-card {
    display: block;
    background: #161b22;
    border: 1px solid #30363d;
    border-radius: 12px;
    padding: 28px;
    text-decoration: none;
    transition: all 0.25s;
}

.ide-card:hover {
    border-color: #58a6ff;
    transform: translateY(-4px);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.3);
}

.ide-card-accent {
    border-color: rgba(102, 126, 234, 0.3);
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.08), rgba(118, 75, 162, 0.06));
}

.ide-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
    color: #667eea;
}

.ide-icon img {
    width: 40px;
    height: 40px;
    object-fit: contain;
}

.ide-card h4 {
    font-size: 1.15em;
    font-weight: 700;
    color: #f0f6fc;
    margin-bottom: 8px;
}

.ide-card p {
    color: #8b949e;
    font-size: 0.92em;
    line-height: 1.6;
    margin-bottom: 12px;
}

.ide-link {
    font-size: 0.88em;
    font-weight: 600;
    color: #58a6ff;
}

.ide-card:hover .ide-link {
    color: #79c0ff;
}

/* ===== Models Grid ===== */
.models-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 24px;
    margin-top: 8px;
}

.model-card {
    background: #161b22;
    border: 1px solid #30363d;
    border-radius: 12px;
    padding: 32px;
    text-align: center;
    transition: all 0.25s;
}

.model-card:hover {
    border-color: #667eea;
    transform: translateY(-4px);
    box-shadow: 0 12px 32px rgba(102, 126, 234, 0.15);
}

.model-logo {
    width: 56px;
    height: 56px;
    border-radius: 14px;
    background: rgba(102, 126, 234, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
    color: #667eea;
}

.model-card h4 {
    font-size: 1.2em;
    font-weight: 700;
    color: #f0f6fc;
    margin-bottom: 8px;
}

.model-card p {
    color: #8b949e;
    font-size: 0.92em;
    line-height: 1.6;
    margin-bottom: 16px;
}

.model-badge {
    display: inline-block;
    padding: 4px 12px;
    background: rgba(102, 126, 234, 0.1);
    border: 1px solid rgba(102, 126, 234, 0.2);
    border-radius: 100px;
    font-size: 0.78em;
    font-weight: 600;
    color: #a5b4fc;
}

.models-note {
    margin-top: 40px;
    text-align: center;
    padding: 24px;
    background: rgba(240, 136, 62, 0.06);
    border: 1px solid rgba(240, 136, 62, 0.15);
    border-radius: 12px;
}

.models-note p {
    color: #c9d1d9;
    font-size: 0.95em;
}

.models-note a {
    color: #58a6ff;
    font-weight: 600;
}

/* ===== Capabilities Grid ===== */
.capabilities-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
}

.capability-card {
    background: #161b22;
    border: 1px solid #30363d;
    border-radius: 12px;
    padding: 28px;
    transition: all 0.25s;
}

.capability-card:hover {
    border-color: #30363d;
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}

.capability-icon {
    font-size: 1.6em;
    margin-bottom: 12px;
}

.capability-card h4 {
    font-size: 1.05em;
    font-weight: 700;
    color: #f0f6fc;
    margin-bottom: 8px;
}

.capability-card p {
    color: #8b949e;
    font-size: 0.9em;
    line-height: 1.6;
}

/* ===== Quick Start ===== */
.quickstart-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 32px;
    text-align: center;
}

.quickstart-step {
    padding: 24px;
}

.step-number {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: #fff;
    font-size: 1.3em;
    font-weight: 800;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
}

.quickstart-step h4 {
    font-size: 1.1em;
    font-weight: 700;
    color: #f0f6fc;
    margin-bottom: 8px;
}

.quickstart-step p {
    color: #8b949e;
    font-size: 0.92em;
    line-height: 1.6;
}

/* ===== Community SDK Note ===== */
.community-sdk-note {
    margin-top: 20px;
    padding: 14px 18px;
    background: rgba(88, 166, 255, 0.08);
    border: 1px solid rgba(88, 166, 255, 0.2);
    border-radius: 10px;
    font-size: 0.92em;
    line-height: 1.6;
    color: #c9d1d9;
}

.community-sdk-note a {
    color: #58a6ff;
    font-weight: 600;
}

/* ===== Awesome Copilot Section ===== */
.awesome-card {
    background: linear-gradient(135deg, rgba(88, 166, 255, 0.06), rgba(139, 92, 246, 0.06));
    border: 1px solid #30363d;
    border-radius: 16px;
    overflow: hidden;
    max-width: 900px;
    margin: 0 auto;
}

.awesome-card-header {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 32px 36px 20px;
    border-bottom: 1px solid rgba(48, 54, 61, 0.6);
}

.awesome-icon {
    font-size: 2.5em;
    flex-shrink: 0;
}

.awesome-card-header h3 {
    font-size: 1.5em;
    font-weight: 700;
    color: #f0f6fc;
    margin-bottom: 4px;
}

.awesome-tagline {
    color: #8b949e;
    font-size: 0.95em;
}

.awesome-card-body {
    padding: 28px 36px 36px;
}

.awesome-features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 28px;
}

.awesome-feature {
    padding: 16px;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 10px;
    border: 1px solid rgba(48, 54, 61, 0.5);
}

.awesome-feature strong {
    display: block;
    color: #f0f6fc;
    margin-bottom: 6px;
    font-size: 0.95em;
}

.awesome-feature p {
    color: #8b949e;
    font-size: 0.85em;
    line-height: 1.5;
}

.awesome-stats {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
    justify-content: center;
    margin-bottom: 24px;
    padding: 16px;
    background: rgba(88, 166, 255, 0.05);
    border-radius: 10px;
    font-size: 0.92em;
    color: #c9d1d9;
}

.awesome-links {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

@media (max-width: 768px) {
    .awesome-features {
        grid-template-columns: 1fr;
    }

    .awesome-card-header {
        flex-direction: column;
        text-align: center;
        padding: 24px 20px 16px;
    }

    .awesome-card-body {
        padding: 20px;
    }

    .awesome-stats {
        flex-direction: column;
        align-items: center;
        gap: 8px;
    }
}

/* ===== CTA Section ===== */
.cta-section {
    padding: 100px 0;
    text-align: center;
    background:
        radial-gradient(ellipse 70% 50% at 50% 100%, rgba(102, 126, 234, 0.15), transparent),
        #0d1117;
}

.cta-section h2 {
    font-size: clamp(1.8em, 4vw, 2.5em);
    font-weight: 800;
    color: #f0f6fc;
    margin-bottom: 12px;
}

.cta-section p {
    color: #8b949e;
    font-size: 1.15em;
    margin-bottom: 32px;
}

.cta-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ===== Footer ===== */
footer {
    padding: 48px 0;
    text-align: center;
    border-top: 1px solid #21262d;
}

footer p {
    color: #6e7681;
    font-size: 0.9em;
    margin-bottom: 12px;
}

.footer-links {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
    align-items: center;
}

.footer-links a {
    color: #8b949e;
    font-size: 0.85em;
    transition: color 0.2s;
}

.footer-links a:hover {
    color: #58a6ff;
}

.footer-links span {
    color: #30363d;
}

/* ===== Responsive ===== */
@media (max-width: 900px) {
    .feature-highlight {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .feature-highlight.reverse {
        direction: ltr;
    }

    .hero {
        min-height: auto;
        padding: 120px 24px 100px;
    }

    .myth-section {
        margin-top: -40px;
    }

    .myth-card {
        flex-direction: column;
        gap: 16px;
    }
}

@media (max-width: 640px) {
    .hero {
        padding: 100px 16px 80px;
    }

    .hero-cta {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 300px;
        text-align: center;
    }

    .ide-grid {
        grid-template-columns: 1fr;
    }

    .section-dark,
    .section-gradient {
        padding: 60px 0;
    }

    .subsection-title {
        margin-top: 48px;
    }
}