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

/* ─── DESIGN TOKENS (Apple-inspired, dark mode, VOLTA brand) ──────────── */
:root {
    --color-bg: #000000;
    --color-bg-elevated: #0a0a0a;
    --color-bg-card: #111111;
    --color-text-primary: #f5f5f7;
    --color-text-secondary: #86868b;
    --color-text-tertiary: #6e6e73;
    --color-accent: #fbbf24;          /* lightning yellow */
    --color-accent-bright: #fcd34d;   /* brighter highlight yellow */
    --color-accent-glow: rgba(251, 191, 36, 0.4);
    --color-border: rgba(255, 255, 255, 0.1);

    --font-display: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Helvetica Neue", sans-serif;
    --font-body: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", sans-serif;
    --font-mono: "SF Mono", "Monaco", "Menlo", monospace;

    --max-width: 1080px;
    --section-padding: 120px 24px;
    --transition: 400ms cubic-bezier(0.16, 1, 0.3, 1);
}

/* ─── BASE ────────────────────────────────────────────────────────────── */
html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--color-bg);
    color: var(--color-text-primary);
    font-family: var(--font-body);
    font-size: 17px;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

/* ─── NAV ─────────────────────────────────────────────────────────────── */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    background: rgba(0, 0, 0, 0.72);
    border-bottom: 1px solid var(--color-border);
    height: 56px;
}

.nav-inner {
    max-width: var(--max-width);
    height: 100%;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    color: var(--color-text-primary);
    text-decoration: none;
    font-size: 18px;
    font-weight: 700;
    letter-spacing: 0.05em;
    display: flex;
    align-items: center;
    gap: 8px;
}

.logo-bolt {
    width: 18px;
    height: 18px;
    color: var(--color-accent);
    filter: drop-shadow(0 0 6px var(--color-accent-glow));
}

.nav-links {
    display: flex;
    gap: 32px;
}

.nav-links a {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 400;
    transition: color var(--transition);
}

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

/* ─── HERO ────────────────────────────────────────────────────────────── */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 80px 24px 40px;
    position: relative;
    background:
        radial-gradient(ellipse at top, rgba(251, 191, 36, 0.12) 0%, transparent 50%),
        radial-gradient(ellipse at bottom, rgba(251, 191, 36, 0.04) 0%, transparent 60%);
    overflow: hidden;
}

/* Subtle electric grid behind hero */
.hero::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(251, 191, 36, 0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(251, 191, 36, 0.04) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
    pointer-events: none;
}

.hero-content {
    text-align: center;
    max-width: 800px;
    position: relative;
    z-index: 1;
    animation: fadeInUp 1s var(--transition) both;
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(72px, 18vw, 240px);
    font-weight: 800;
    letter-spacing: -0.05em;
    line-height: 0.9;
    background: linear-gradient(180deg, #ffffff 0%, #999999 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 24px;
    text-shadow: 0 0 80px var(--color-accent-glow);
}

.hero-tagline {
    font-size: clamp(18px, 2vw, 22px);
    font-weight: 500;
    color: var(--color-accent);
    margin-bottom: 16px;
    letter-spacing: 0.02em;
}

.hero-subtitle {
    font-size: clamp(18px, 2.5vw, 24px);
    font-weight: 400;
    color: var(--color-text-secondary);
    line-height: 1.5;
    margin-bottom: 48px;
}

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

.btn-primary {
    display: inline-block;
    background: var(--color-accent);
    color: #000000;
    padding: 14px 28px;
    border-radius: 980px;
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
    transition: all var(--transition);
    box-shadow: 0 4px 20px rgba(251, 191, 36, 0.25);
}

.btn-primary:hover {
    background: var(--color-accent-bright);
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(251, 191, 36, 0.4);
}

.hero-scroll {
    position: absolute;
    bottom: 40px;
    color: var(--color-text-tertiary);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    animation: bounce 2s infinite;
    z-index: 1;
}

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

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

/* ─── SHARED CONTAINER ────────────────────────────────────────────────── */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

.section-label {
    font-size: 13px;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.18em;
    margin-bottom: 16px;
    font-weight: 600;
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(40px, 6vw, 72px);
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1.05;
    margin-bottom: 24px;
}

.section-subtitle {
    font-size: clamp(18px, 2vw, 22px);
    color: var(--color-text-secondary);
    line-height: 1.5;
    max-width: 720px;
    margin-bottom: 64px;
}

/* ─── WORK SECTION ────────────────────────────────────────────────────── */
.work {
    padding: var(--section-padding);
    background: var(--color-bg-elevated);
}

.project-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 24px;
    overflow: hidden;
    transition: all var(--transition);
}

.project-card:hover {
    border-color: rgba(251, 191, 36, 0.3);
    transform: translateY(-4px);
    box-shadow: 0 20px 60px rgba(251, 191, 36, 0.15);
}

.project-image {
    height: 320px;
    background: linear-gradient(135deg, #1a1a1a 0%, #0a0a0a 100%);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.project-image::before {
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at center, rgba(251, 191, 36, 0.15) 0%, transparent 70%);
}

/* electric pulse line */
.project-image::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    height: 1px;
    width: 100%;
    background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
    opacity: 0.6;
    animation: pulseLine 3s ease-in-out infinite;
}

@keyframes pulseLine {
    0%, 100% { opacity: 0.2; }
    50% { opacity: 0.8; }
}

.project-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    font-family: var(--font-mono);
    text-align: center;
    z-index: 1;
}

.ticker-text {
    font-size: clamp(28px, 4vw, 56px);
    color: var(--color-text-primary);
    font-weight: 700;
    letter-spacing: 0.05em;
}

.ticker-line {
    color: var(--color-accent);
    font-size: 13px;
    letter-spacing: 0.1em;
}

.ticker-status {
    color: var(--color-text-tertiary);
    font-size: 12px;
    letter-spacing: 0.15em;
    text-transform: uppercase;
}

.project-details {
    padding: 48px;
}

.detail-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 32px;
    margin-bottom: 48px;
}

.detail-item h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--color-text-primary);
}

.detail-item p {
    color: var(--color-text-secondary);
    font-size: 15px;
    line-height: 1.6;
}

.tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    padding-top: 32px;
    border-top: 1px solid var(--color-border);
}

.tech-tag {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--color-border);
    color: var(--color-text-secondary);
    padding: 6px 14px;
    border-radius: 980px;
    font-size: 13px;
    font-weight: 500;
}

/* ─── ABOUT ───────────────────────────────────────────────────────────── */
.about {
    padding: var(--section-padding);
}

.about-content p {
    font-size: clamp(18px, 2vw, 22px);
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin-bottom: 24px;
    max-width: 720px;
}

.skills {
    margin-top: 64px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 32px;
}

.skill-group h4 {
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--color-accent);
    margin-bottom: 12px;
    font-weight: 600;
}

.skill-group p {
    font-size: 16px;
    color: var(--color-text-primary);
    line-height: 1.5;
}

/* ─── CONTACT ─────────────────────────────────────────────────────────── */
.contact {
    padding: var(--section-padding);
    background: var(--color-bg-elevated);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.contact::before {
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at center, rgba(251, 191, 36, 0.06) 0%, transparent 60%);
    pointer-events: none;
}

.contact-title {
    font-family: var(--font-display);
    font-size: clamp(40px, 6vw, 72px);
    font-weight: 700;
    letter-spacing: -0.03em;
    margin-bottom: 16px;
    position: relative;
}

.contact-subtitle {
    font-size: clamp(18px, 2vw, 22px);
    color: var(--color-text-secondary);
    margin-bottom: 32px;
    position: relative;
}

.contact-email {
    display: inline-block;
    color: var(--color-accent);
    font-size: clamp(20px, 3vw, 32px);
    font-weight: 500;
    text-decoration: none;
    letter-spacing: -0.02em;
    transition: opacity var(--transition);
    position: relative;
    word-break: break-all;
}

.contact-email:hover {
    opacity: 0.7;
}

/* ─── FOOTER ──────────────────────────────────────────────────────────── */
.footer {
    padding: 48px 24px;
    text-align: center;
    border-top: 1px solid var(--color-border);
}

.footer p {
    color: var(--color-text-tertiary);
    font-size: 13px;
    letter-spacing: 0.05em;
}

/* ─── REVEAL ON SCROLL ────────────────────────────────────────────────── */
.reveal {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 800ms var(--transition), transform 800ms var(--transition);
}

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

/* ─── MOBILE RESPONSIVENESS ───────────────────────────────────────────── */
@media (max-width: 768px) {
    :root {
        --section-padding: 80px 20px;
    }

    .nav-links {
        gap: 20px;
    }

    .nav-links a {
        font-size: 13px;
    }

    .project-details {
        padding: 32px 24px;
    }

    .detail-grid {
        gap: 24px;
    }
}