/* ============================================================
   phan-tastic.eu — main stylesheet
   System fonts only — no external font loading
   ============================================================ */

:root {
    /* Color palette */
    --bg-primary:    #080810;
    --bg-secondary:  #0d0d1a;
    --bg-card:       #111120;
    --bg-card-hover: #17172a;

    --accent-cyan:   #00d4ff;
    --accent-teal:   #00ffb3;
    --accent-purple: #a855f7;
    --accent-pink:   #e879f9;

    --text-primary:  #e4e4f0;
    --text-secondary:#8888aa;
    --text-muted:    #44445a;

    --border:        rgba(255, 255, 255, 0.07);
    --border-accent: rgba(0, 212, 255, 0.28);

    --grad-accent: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
    --grad-text:   linear-gradient(135deg, var(--accent-cyan) 0%, var(--accent-purple) 55%, var(--accent-pink) 100%);

    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, Ubuntu, Cantarell, sans-serif;
    --font-mono: 'SF Mono', 'Fira Code', 'Cascadia Code', Consolas, 'Courier New', monospace;

    /* Layout */
    --max-width:  1200px;
    --nav-height: 68px;
    --pad-h:      1.5rem;

    /* Motion */
    --ease-out:   cubic-bezier(0.16, 1, 0.3, 1);
    --dur:        0.25s;
}

/* ── Reset ──────────────────────────────────────────────── */

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

img, svg {
    display: block;
    max-width: 100%;
}

a {
    color: inherit;
}

/* ── WebGL Canvas ───────────────────────────────────────── */

#bg-canvas {
    position: fixed;
    top: 0;
    left: 0;
    pointer-events: none;
    z-index: 0;
}

/* ── Layout helpers ─────────────────────────────────────── */

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--pad-h);
}

/* ── Navigation ─────────────────────────────────────────── */

.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    display: flex;
    align-items: center;
    z-index: 200;
    transition: background var(--dur) var(--ease-out),
                border-color var(--dur) var(--ease-out),
                backdrop-filter var(--dur);
    border-bottom: 1px solid transparent;
}

.site-header.scrolled {
    background: rgba(8, 8, 16, 0.88);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    border-bottom-color: var(--border);
}

.nav {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--pad-h);
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
}

.nav-logo {
    font-size: 1.2rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    text-decoration: none;
    background: var(--grad-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    flex-shrink: 0;
}

.nav-links {
    display: flex;
    gap: 2.5rem;
    list-style: none;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.825rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    font-weight: 500;
    transition: color var(--dur) var(--ease-out);
}

.nav-links a:hover,
.nav-links a:focus-visible {
    color: var(--text-primary);
}

/* hamburger */
.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 36px;
    height: 36px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    flex-shrink: 0;
}

.nav-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text-secondary);
    border-radius: 2px;
    transition: transform var(--dur) var(--ease-out),
                opacity var(--dur) var(--ease-out);
    transform-origin: center;
}

/* ── Hero ───────────────────────────────────────────────── */

.section-hero {
    position: relative;
    z-index: 1;
    min-height: 100svh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--nav-height) var(--pad-h) 6rem;
}

/* subtle vignette so text stays readable */
.section-hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse 80% 70% at 50% 50%,
        transparent 30%,
        rgba(8, 8, 16, 0.55) 100%);
    pointer-events: none;
    z-index: -1;
}

.hero-content {
    max-width: 820px;
}

.hero-eyebrow {
    font-size: 0.8rem;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: var(--accent-cyan);
    margin-bottom: 0.75rem;
    opacity: 0;
    animation: fadeInUp 0.8s var(--ease-out) 0.2s forwards;
}

.hero-name {
    font-size: clamp(3.2rem, 9vw, 7rem);
    font-weight: 800;
    letter-spacing: -0.04em;
    line-height: 1;
    margin-bottom: 0.75rem;
    background: var(--grad-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    opacity: 0;
    animation: fadeInUp 0.8s var(--ease-out) 0.4s forwards;
}

.hero-tagline {
    font-size: 1rem;
    color: var(--text-secondary);
    letter-spacing: 0.08em;
    margin-bottom: 1.5rem;
    opacity: 0;
    animation: fadeInUp 0.8s var(--ease-out) 0.6s forwards;
}

.hero-description {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 560px;
    margin: 0 auto 2.5rem;
    line-height: 1.75;
    opacity: 0;
    animation: fadeInUp 0.8s var(--ease-out) 0.75s forwards;
}

.hero-scroll-hint {
    position: absolute;
    bottom: 2.5rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    opacity: 0;
    animation: fadeIn 1s var(--ease-out) 1.6s forwards;
}

.hero-scroll-hint span {
    font-size: 0.65rem;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: var(--text-muted);
}

.scroll-line {
    width: 1px;
    height: 56px;
    background: linear-gradient(to bottom, var(--accent-cyan), transparent);
    animation: scrollPulse 2.2s ease-in-out infinite;
}

/* ── Buttons ────────────────────────────────────────────── */

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.8rem 2.2rem;
    border-radius: 0.5rem;
    font-family: var(--font-sans);
    font-size: 0.825rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    text-decoration: none;
    cursor: pointer;
    border: none;
    opacity: 0;
    animation: fadeInUp 0.8s var(--ease-out) 0.95s forwards;
    transition: transform var(--dur) var(--ease-out),
                box-shadow var(--dur) var(--ease-out);
}

.btn-primary {
    background: var(--grad-accent);
    color: #000;
    box-shadow: 0 0 28px rgba(0, 212, 255, 0.18);
}

.btn-primary:hover,
.btn-primary:focus-visible {
    transform: translateY(-2px);
    box-shadow: 0 0 44px rgba(0, 212, 255, 0.32);
}

/* ── Section typography ─────────────────────────────────── */

.section-title {
    font-size: clamp(1.8rem, 4vw, 2.8rem);
    font-weight: 700;
    letter-spacing: -0.025em;
    margin-bottom: 0.5rem;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    display: block;
    height: 3px;
    width: 2.8rem;
    background: var(--grad-accent);
    border-radius: 2px;
    margin-top: 0.55rem;
}

.section-subtitle {
    color: var(--text-secondary);
    font-size: 1.05rem;
    margin-top: 0.75rem;
    margin-bottom: 3.5rem;
    max-width: 600px;
}

/* ── About ──────────────────────────────────────────────── */

.section-about {
    position: relative;
    z-index: 1;
    padding: 7rem 0;
    background: linear-gradient(
        to bottom,
        transparent,
        rgba(13, 13, 26, 0.75) 20%,
        rgba(13, 13, 26, 0.75) 80%,
        transparent
    );
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 5rem;
    align-items: start;
    margin-top: 2.5rem;
}

.about-text p {
    color: var(--text-secondary);
    line-height: 1.85;
    margin-bottom: 1.25rem;
    font-size: 1.05rem;
}

.about-text p:last-child {
    margin-bottom: 0;
}

.about-text strong {
    color: var(--accent-cyan);
    font-weight: 600;
}

.about-tags {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.tag-label {
    display: block;
    font-size: 0.68rem;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.45rem;
}

.tag {
    display: inline-flex;
    align-items: center;
    padding: 0.28rem 0.85rem;
    border-radius: 100px;
    font-size: 0.8rem;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border);
    color: var(--text-secondary);
}

.tag.accent {
    background: rgba(0, 212, 255, 0.08);
    border-color: rgba(0, 212, 255, 0.22);
    color: var(--accent-cyan);
}

.tag.ai {
    background: rgba(168, 85, 247, 0.08);
    border-color: rgba(168, 85, 247, 0.22);
    color: var(--accent-purple);
}

.tag.work {
    background: rgba(251, 191, 36, 0.07);
    border-color: rgba(251, 191, 36, 0.22);
    color: #f59e0b;
}

/* ── Projects ───────────────────────────────────────────── */

.section-projects {
    position: relative;
    z-index: 1;
    padding: 7rem 0 8rem;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
}

.project-card {
    border-radius: 1rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    transition: transform var(--dur) var(--ease-out),
                border-color var(--dur) var(--ease-out),
                box-shadow var(--dur) var(--ease-out);
}

.project-card:hover {
    transform: translateY(-5px);
    border-color: var(--border-accent);
    box-shadow: 0 24px 64px rgba(0, 0, 0, 0.45),
                0 0 48px rgba(0, 212, 255, 0.07);
}

.project-card--coming-soon {
    opacity: 0.55;
}

.project-card--coming-soon:hover {
    transform: none;
    border-color: var(--border);
    box-shadow: none;
}

.project-card-inner {
    padding: 2rem 2rem 1.75rem;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    height: 100%;
}

.project-icon {
    width: 2.8rem;
    height: 2.8rem;
    padding: 0.55rem;
    border-radius: 0.75rem;
    background: rgba(0, 212, 255, 0.08);
    border: 1px solid rgba(0, 212, 255, 0.18);
    color: var(--accent-cyan);
    flex-shrink: 0;
}

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

.project-content {
    flex: 1;
}

.project-title {
    font-size: 1.2rem;
    font-weight: 700;
    letter-spacing: -0.015em;
    margin-bottom: 0.6rem;
    color: var(--text-primary);
}

.project-description {
    color: var(--text-secondary);
    line-height: 1.72;
    font-size: 0.95rem;
}

.project-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.5rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
}

.tech-tag {
    padding: 0.18rem 0.55rem;
    border-radius: 100px;
    font-size: 0.68rem;
    font-family: var(--font-mono);
    letter-spacing: 0.03em;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.18);
    color: var(--text-secondary);
}

.ai-badge {
    display: flex;
    align-items: center;
    gap: 0.38rem;
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    color: var(--accent-purple);
    white-space: nowrap;
}

.ai-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--accent-purple);
    box-shadow: 0 0 6px var(--accent-purple);
    animation: pulseDot 2.4s ease-in-out infinite;
}

.project-link {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    color: var(--accent-cyan);
    text-decoration: none;
    font-size: 0.825rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    transition: gap var(--dur) var(--ease-out),
                opacity var(--dur);
    align-self: flex-start;
}

.project-link svg {
    width: 14px;
    height: 14px;
    flex-shrink: 0;
    transition: transform var(--dur) var(--ease-out);
}

.project-link:hover,
.project-link:focus-visible {
    gap: 0.55rem;
}

.project-link:hover svg,
.project-link:focus-visible svg {
    transform: translate(2px, -2px);
}

.project-link--disabled {
    color: var(--text-muted);
    cursor: default;
    pointer-events: none;
}

/* ── Footer ─────────────────────────────────────────────── */

.site-footer {
    position: relative;
    z-index: 1;
    padding: 5rem 0 3rem;
    border-top: 1px solid var(--border);
    background: rgba(8, 8, 16, 0.6);
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 0.75rem;
}

.footer-brand {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    background: var(--grad-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer-tagline {
    color: var(--text-muted);
    font-size: 0.85rem;
    letter-spacing: 0.06em;
}

.footer-nav {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
    justify-content: center;
    margin: 0.5rem 0;
}

.footer-nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
    transition: color var(--dur) var(--ease-out);
}

.footer-nav a:hover,
.footer-nav a:focus-visible {
    color: var(--text-primary);
}

.footer-copy {
    color: var(--text-muted);
    font-size: 0.78rem;
    margin-top: 0.25rem;
}

/* ── Scroll reveal ──────────────────────────────────────── */

.reveal {
    opacity: 0;
    transform: translateY(28px);
    transition: opacity 0.7s var(--ease-out),
                transform 0.7s var(--ease-out);
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ── Tag rotation animations ────────────────────────────── */

#likes-tags {
    min-height: 6rem;
}

.tag-exit {
    animation: tagExit 0.7s var(--ease-out) forwards;
    pointer-events: none;
}

.tag-enter {
    animation: tagEnter 0.9s var(--ease-out) forwards;
}

@keyframes tagExit {
    0%   { opacity: 1;   transform: scale(1);    filter: blur(0px);
           border-color: rgba(255,255,255,0.18); color: var(--text-secondary); }
    40%  { opacity: 0.8; transform: scale(1.1);  filter: blur(0px);
           border-color: rgba(0,212,255,0.7);    color: var(--accent-cyan);
           box-shadow: 0 0 10px rgba(0,212,255,0.35); }
    100% { opacity: 0;   transform: scale(0.72); filter: blur(5px);
           border-color: rgba(0,212,255,0.2);    color: var(--accent-cyan);
           box-shadow: 0 0 4px rgba(0,212,255,0.1); }
}

@keyframes tagEnter {
    0%   { opacity: 0;   transform: scale(0.72); filter: blur(5px);
           border-color: rgba(0,212,255,0.2);    color: var(--accent-cyan);
           box-shadow: 0 0 4px rgba(0,212,255,0.1); }
    55%  { opacity: 0.9; transform: scale(1.07); filter: blur(0px);
           border-color: rgba(0,212,255,0.7);    color: var(--accent-cyan);
           box-shadow: 0 0 12px rgba(0,212,255,0.4); }
    100% { opacity: 1;   transform: scale(1);    filter: blur(0px);
           border-color: rgba(255,255,255,0.18); color: var(--text-secondary);
           box-shadow: none; }
}

/* ── Keyframes ──────────────────────────────────────────── */

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(22px); }
    to   { opacity: 1; transform: translateY(0);    }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to   { opacity: 1; }
}

@keyframes scrollPulse {
    0%, 100% { opacity: 0.35; }
    50%       { opacity: 1;    }
}

@keyframes pulseDot {
    0%, 100% { box-shadow: 0 0 4px  var(--accent-purple); opacity: 1;   }
    50%       { box-shadow: 0 0 10px var(--accent-purple); opacity: 0.6; }
}

/* ── Responsive ─────────────────────────────────────────── */

@media (max-width: 900px) {
    .projects-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: var(--nav-height);
        left: 0;
        right: 0;
        background: rgba(8, 8, 16, 0.97);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 1.5rem var(--pad-h);
        gap: 1.5rem;
        border-bottom: 1px solid var(--border);
    }

    .nav-links.open {
        display: flex;
    }

    .nav-links a {
        font-size: 0.95rem;
    }

    .nav-toggle {
        display: flex;
    }

    .about-grid {
        grid-template-columns: 1fr;
        gap: 2.5rem;
    }

    .hero-description {
        font-size: 1rem;
    }

    .section-about,
    .section-projects {
        padding: 5rem 0;
    }
}

@media (max-width: 480px) {
    :root {
        --pad-h: 1rem;
    }

    .project-card-inner {
        padding: 1.5rem 1.25rem;
    }

    .project-meta {
        flex-direction: column;
        align-items: flex-start;
    }

    .hero-scroll-hint {
        display: none;
    }
}

/* ── Focus styles ───────────────────────────────────────── */

:focus-visible {
    outline: 2px solid var(--accent-cyan);
    outline-offset: 3px;
    border-radius: 3px;
}

/* ── Reduced motion ─────────────────────────────────────── */

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

    html {
        scroll-behavior: auto;
    }

    .hero-eyebrow,
    .hero-name,
    .hero-tagline,
    .hero-description,
    .btn,
    .hero-scroll-hint {
        opacity: 1;
        transform: none;
    }
}