/* ========================================
   RESPONSIVE — Mobile & Tablet Breakpoints
======================================== */

/* ========================================
   HAMBURGER MENU (hidden on desktop)
======================================== */
.nav-hamburger {
    display: none;
    background: none; border: none; cursor: pointer;
    width: 32px; height: 32px;
    position: relative; z-index: 100003;
    padding: 0;
}
.nav-hamburger span {
    display: block; width: 20px; height: 2px;
    background: var(--text-primary);
    position: absolute; left: 6px;
    transition: all 0.3s ease;
    border-radius: 2px;
}
.nav-hamburger span:nth-child(1) { top: 9px; }
.nav-hamburger span:nth-child(2) { top: 15px; }
.nav-hamburger span:nth-child(3) { top: 21px; }
.nav-hamburger.active span:nth-child(1) {
    top: 15px; transform: rotate(45deg);
}
.nav-hamburger.active span:nth-child(2) { opacity: 0; }
.nav-hamburger.active span:nth-child(3) {
    top: 15px; transform: rotate(-45deg);
}

.mobile-nav {
    display: none;
    position: fixed; inset: 0;
    background: rgba(5, 5, 8, 0.97);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    z-index: 100002;
    justify-content: center; align-items: center;
    opacity: 0; visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}
.mobile-nav.open {
    opacity: 1; visibility: visible;
}
.mobile-nav-links {
    list-style: none; text-align: center;
    display: flex; flex-direction: column; gap: 32px;
}
.mobile-nav-links a {
    font-family: var(--font-display);
    font-size: 1.8rem; font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.02em;
    transition: color 0.3s ease;
}
.mobile-nav-links a:hover { color: var(--accent); }
.mobile-lang-btn {
    font-family: var(--font-mono);
    font-size: 0.75rem; font-weight: 500;
    color: var(--text-secondary);
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 100px;
    padding: 8px 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    letter-spacing: 0.1em;
}
.mobile-lang-btn:hover {
    color: var(--accent);
    border-color: rgba(0,255,136,0.2);
    background: rgba(0,255,136,0.05);
}
.mobile-nav-close {
    position: absolute; top: 20px; right: 20px;
    width: 44px; height: 44px;
    display: flex; align-items: center; justify-content: center;
    background: rgba(255,255,255,0.08);
    border: 1px solid rgba(0,255,136,0.2);
    border-radius: 10px;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.3s ease;
    z-index: 10;
}
.mobile-nav-close svg { width: 20px; height: 20px; }
.mobile-nav-close:hover {
    color: var(--accent);
    border-color: rgba(0,255,136,0.4);
    background: rgba(0,255,136,0.1);
    box-shadow: 0 0 16px rgba(0,255,136,0.15);
}
.mobile-nav-bgm {
    font-family: var(--font-mono);
    font-size: 0.75rem; font-weight: 500;
    color: var(--text-secondary);
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 100px;
    padding: 8px 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    letter-spacing: 0.1em;
    display: inline-flex; align-items: center; gap: 6px;
}
.mobile-nav-bgm:hover {
    color: var(--accent);
    border-color: rgba(0,255,136,0.2);
    background: rgba(0,255,136,0.05);
}
.mobile-nav-bgm.playing {
    color: var(--accent);
    border-color: rgba(0,255,136,0.25);
    background: rgba(0,255,136,0.06);
}
.mobile-bgm-state { font-size: 0.65rem; }

/* ========================================
   TABLET (max-width: 900px)
======================================== */
@media (max-width: 900px) {
    /* Nav */
    nav { padding: 16px 24px; }
    .nav-center, .nav-status, .lang-toggle { display: none; }
    .nav-hamburger { display: block; }
    .mobile-nav { display: flex; }

    /* Hero */
    .hero { padding: 120px 24px 145px; }
    .hero-grid-bg { display: none; }
    .hero-name { font-size: clamp(5.5rem, 17vw, 9rem); }
    .motion-toggle { right: 24px; }

    /* About */
    .about {
        grid-template-columns: 1fr;
        padding: 80px 24px; gap: 48px;
    }
    .stats { grid-template-columns: repeat(2, 1fr); }

    /* Orbit / Tech */
    .orbit-container { width: min(440px, 100%); height: auto; aspect-ratio: 1; }
    .orbit-center { width: 36px; height: 36px; font-size: 0.5rem; }
    .orbit-item { font-size: 0.55rem; padding: 4px 8px; }

    /* Projects */
    .projects, .blog { padding: 80px 24px; }
    .projects-grid { grid-template-columns: 1fr; }
    .project-card { aspect-ratio: 16 / 9; }
    .project-card-content { padding: 24px; }
    .projects-header, .blog-header {
        flex-direction: column; align-items: flex-start; gap: 8px;
    }

    /* Blog */
    .blog-item {
        grid-template-columns: 70px 1fr;
        gap: 16px; padding: 24px 0;
    }
    .blog-item-meta { display: none; }
    .blog-item::before { left: -24px; right: -24px; }

    /* CTA */
    .cta { padding: 100px 24px; }
    .cta-bg-text { font-size: clamp(2rem, 10vw, 6rem); }

    /* Footer */
    footer {
        padding: 24px;
        flex-direction: column; gap: 16px;
        text-align: center;
    }

    /* Cursor — hide on touch */
    .cursor, .cursor-dot, .cursor-trail { display: none !important; }
    body { cursor: auto !important; }

    /* Tech Section */
    .tech-section { padding: 80px 24px 100px; }

    /* Timeline */
    .timeline-item { flex-direction: column; gap: 16px; }
    .timeline-left { width: 100%; text-align: left; }
    .timeline-center { display: none; }

    /* Skills */
    .skills-section { padding: 80px 24px; }
    .skills-grid { grid-template-columns: 1fr; gap: 20px; }
    .skill-category { padding: 24px; }

    /* Featured Code */
    .featured-code-section { padding: 80px 24px; }
    .featured-code-wrap { grid-template-columns: 1fr; gap: 32px; }
    .featured-code-text { order: 1; }
    .code-window { order: 2; overflow: hidden; max-width: 100%; }
    .code-window-body { padding: 16px; font-size: 0.65rem; overflow-x: auto; }
    .code-line { font-size: 0.65rem; }

    /* GitHub */
    .github-section { padding: 80px 24px; }
    .gh-stats-row { gap: 24px; flex-wrap: wrap; }
    .gh-stat-num { font-size: 1.5rem; }
    .gh-heatmap { padding: 16px; overflow-x: auto; }
    .gh-grid {
        grid-template-columns: repeat(26, 1fr);
        gap: 2px;
    }
    .gh-cell { min-width: 6px; }

    /* Testimonials */
    .testimonials-section { padding: 80px 24px; }
    .testimonials-grid { grid-template-columns: 1fr; gap: 16px; }
    .testimonial-card { padding: 24px; }

    /* Contact */
    .contact-section { padding: 80px 24px; }
    .contact-form-wrap { grid-template-columns: 1fr; gap: 32px; }

    /* Command Palette */
    .cmdk-modal { width: 95vw !important; }

    /* Now Playing — hide on mobile to avoid overlap */
    .now-playing { display: none; }

    /* Back to Top */
    .back-to-top { bottom: 20px; right: 20px; width: 42px; height: 42px; }

    /* Next Chapter */
    .next-chapter { padding: 80px 24px; }
    .next-card-inner { flex-direction: column; padding: 28px 20px; }
    .next-card-arrow {
        width: 100%; height: 50px;
        flex-direction: row;
    }
    .arrow-beam { width: auto; height: 2px; flex: 1; }
    .arrow-beam::after {
        width: 16px; height: 2px;
        animation: beamTravelH 2s linear infinite;
    }
    @keyframes beamTravelH {
        0% { left: -16px; top: 0; opacity: 0; }
        20% { opacity: 1; }
        80% { opacity: 1; }
        100% { left: calc(100% + 16px); top: 0; opacity: 0; }
    }
    .next-card-progress { padding: 16px 20px 24px; }
    .next-milestones { gap: 12px; }
    .next-milestone { font-size: 0.65rem; padding: 8px 12px; }
    .next-milestone .icon { font-size: 0.85rem; }
    .next-floating-stats {
        flex-direction: column; align-items: center; gap: 12px;
    }
    .next-float-stat { width: 100%; max-width: 280px; padding: 14px 16px; }
    .float-stat-num { font-size: 1.3rem; }
    .float-stat-label { font-size: 0.55rem; }

    /* Scroll Progress */
    .scroll-progress { height: 2px; }
}

/* ========================================
   SMALL PHONES (max-width: 480px)
======================================== */
@media (max-width: 480px) {
    .hero-name { font-size: clamp(5rem, 23vw, 7rem); }
    .hero-badge { font-size: 0.56rem; padding: 6px 0; letter-spacing: 0.04em; margin-bottom: 22px; }
    .hero-typing { font-size: 0.75rem; }
    .hero-actions { gap: 8px; }
    .hero-action { padding: 12px 14px; gap: 14px; font-size: 0.64rem; }
    .motion-toggle { right: 16px; bottom: 20px; font-size: 0.58rem; }
    .hero-scroll { left: 24px; bottom: 28px; transform: none; flex-direction: row; }
    .hero-scroll-line { width: 26px; height: 1px; }

    .about { padding: 60px 16px; gap: 32px; }
    .about-heading { font-size: clamp(1.5rem, 6vw, 2rem); }
    .about-text { font-size: 0.75rem; }
    .stats { grid-template-columns: repeat(2, 1fr); gap: 16px; }
    .stat-num { font-size: clamp(1.4rem, 5vw, 2rem); }
    .stat-label { font-size: 0.58rem; }

    .terminal { border-radius: 10px; }
    .terminal-body { padding: 16px; font-size: 0.65rem; }

    .projects, .blog { padding: 60px 16px; }
    .project-card-content { padding: 16px; }
    .home-page .project-card {
        display: flex; flex-direction: column; justify-content: flex-end;
        aspect-ratio: auto; min-height: 250px;
    }
    .home-page .project-card-content { position: relative; padding: 88px 20px 24px; }
    .project-title { font-size: 1.1rem; }
    .project-desc { font-size: 0.68rem; }
    .blog-item { padding: 20px 0; }

    .cta { padding: 80px 16px; }
    .cta-heading { font-size: clamp(1.6rem, 7vw, 2.5rem); }
    .cta-btn { padding: 14px 32px; font-size: 0.85rem; }

    .skills-section { padding: 60px 16px; }
    .skill-category { padding: 20px; }
    .skill-cat-title { font-size: 0.68rem; }

    .featured-code-section { padding: 60px 16px; }
    .code-window-body { padding: 12px; font-size: 0.58rem; }
    .code-line { font-size: 0.58rem; }
    .code-line::before { width: 22px; margin-right: 10px; font-size: 0.55rem; }

    .github-section { padding: 60px 16px; }
    .gh-stats-row { gap: 16px; }
    .gh-stat-num { font-size: 1.2rem; }
    .gh-stat-label { font-size: 0.55rem; }

    .testimonials-section { padding: 60px 16px; }
    .testimonial-card { padding: 20px; }
    .testimonial-text { font-size: 0.72rem; }

    .contact-section { padding: 60px 16px; }

    .next-chapter { padding: 60px 16px; }
    .next-card-inner { padding: 20px 16px; }
    .next-status-title { font-size: 1.2rem; }
    .next-status-abbr { font-size: 0.55rem; }
    .next-status-sub { font-size: 0.65rem; }
    .next-status-icon { font-size: 1.8rem; margin-bottom: 12px; }
    .next-milestone { font-size: 0.6rem; padding: 6px 10px; }
    .next-float-stat { padding: 12px; }
    .float-stat-num { font-size: 1.1rem; }
    .float-arrow { font-size: 0.8rem; }

    .mobile-nav-links { gap: 24px; }
    .mobile-nav-links a { font-size: 1.4rem; }

    footer { padding: 20px 16px; }
    .footer-copy { font-size: 0.6rem; }
    .footer-links { gap: 16px; }
    .footer-links a { font-size: 0.6rem; }
}

@media (max-height: 540px) and (orientation: landscape) {
    .hero { min-height: 540px; padding: 100px 24px 120px; }
    .hero-name { font-size: clamp(5rem, 12vw, 8rem); }
    .hero-badge { margin-bottom: 18px; }
    .hero-typing { margin-bottom: 20px; }
    .hero-scroll { left: 24px; transform: none; flex-direction: row; }
    .hero-scroll-line { width: 26px; height: 1px; }
}