/* ============================================================
   IRFAN GHAT PORTFOLIO — style.css
   Aesthetic: Refined Dark Technical
   Fonts: Playfair Display (display), Lora (body), JetBrains Mono (mono)
   ============================================================ */

/* ----------------------------------------------------------
   1. CSS VARIABLES
   ---------------------------------------------------------- */
:root {
    --bg: #0d0f14;
    --bg-2: #13161d;
    --bg-3: #1a1e27;
    --surface: #1f2330;
    --surface-2: #252a38;
    --border: #2a2f40;
    --border-light: #343b50;

    --text: #e8e9ed;
    --text-2: #9aa0b5;
    --text-3: #5a6178;

    --accent: #d4a853;
    /* warm amber */
    --accent-dim: #a07a30;
    --accent-glow: rgba(212, 168, 83, 0.12);

    --blue: #5b8cce;
    --green: #5ea87a;
    --red: #b05e5e;

    --font-display: 'Playfair Display', Georgia, serif;
    --font-body: 'Lora', Georgia, serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    --radius: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;

    --transition: 220ms ease;
    --transition-slow: 500ms ease;

    --max-width: 1100px;
    --section-gap: 120px;
}

/* ----------------------------------------------------------
   2. RESET & BASE
   ---------------------------------------------------------- */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    background-color: var(--bg);
    color: var(--text);
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* Subtle grain texture overlay */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.04'/%3E%3C/svg%3E");
    pointer-events: none;
    z-index: 9999;
    opacity: 0.3;
}

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

ul {
    list-style: none;
}

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

/* ----------------------------------------------------------
   3. TYPOGRAPHY UTILITIES
   ---------------------------------------------------------- */
.mono {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.04em;
}

.accent {
    color: var(--accent);
}

strong {
    font-weight: 700;
    color: var(--text);
}

em {
    font-style: italic;
    color: var(--accent);
}

/* ----------------------------------------------------------
   4. LAYOUT
   ---------------------------------------------------------- */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 40px;
}

.section {
    padding: var(--section-gap) 0;
}

.section-label {
    color: var(--text-3);
    font-size: 0.7rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    margin-bottom: 20px;
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    line-height: 1.15;
    color: var(--text);
    margin-bottom: 48px;
}

/* ----------------------------------------------------------
   5. NAVIGATION
   ---------------------------------------------------------- */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 40px;
    background: rgba(13, 15, 20, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid transparent;
    transition: border-color var(--transition), background var(--transition);
}

.nav.scrolled {
    border-bottom-color: var(--border);
}

.nav-logo {
    font-family: var(--font-mono);
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text);
    letter-spacing: -0.02em;
}

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

.nav-links a {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--text-2);
    transition: color var(--transition);
}

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

.nav-cta {
    color: var(--accent) !important;
    border: 1px solid var(--accent-dim);
    padding: 6px 16px;
    border-radius: var(--radius);
    transition: background var(--transition), color var(--transition) !important;
}

.nav-cta:hover {
    background: var(--accent-glow);
    color: var(--accent) !important;
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text);
    font-size: 1.2rem;
    cursor: pointer;
}

/* Mobile nav */
@media (max-width: 720px) {
    .nav-toggle {
        display: block;
    }

    .nav-links {
        display: none;
        position: fixed;
        top: 65px;
        left: 0;
        right: 0;
        background: var(--bg-2);
        border-bottom: 1px solid var(--border);
        flex-direction: column;
        gap: 0;
        padding: 12px 0;
    }

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

    .nav-links li {
        width: 100%;
    }

    .nav-links a {
        display: block;
        padding: 14px 40px;
        border-bottom: 1px solid var(--border);
    }

    .nav-cta {
        border: none;
        border-radius: 0;
    }
}

/* ----------------------------------------------------------
   6. HERO
   ---------------------------------------------------------- */
.site-header {
    position: relative;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding-top: 80px;
    overflow: hidden;
}

/* Subtle background graphic */
.site-header::after {
    content: '';
    position: absolute;
    top: -20%;
    right: -15%;
    width: 600px;
    height: 600px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(212, 168, 83, 0.07) 0%, transparent 65%);
    pointer-events: none;
}

.hero {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 40px;
}

.hero-eyebrow {
    display: flex;
    align-items: center;
    gap: 16px;
    color: var(--text-3);
    margin-bottom: 24px;
    opacity: 0;
    animation: fadeUp 0.7s ease forwards 0.1s;
}

.hero-dot {
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: var(--accent);
}

.hero-name {
    font-family: var(--font-display);
    font-size: clamp(4rem, 10vw, 9rem);
    font-weight: 700;
    line-height: 0.95;
    letter-spacing: -0.02em;
    color: var(--text);
    margin-bottom: 28px;
    opacity: 0;
    animation: fadeUp 0.7s ease forwards 0.25s;
}

.hero-name em {
    font-style: italic;
    color: var(--accent);
}

.hero-tagline {
    font-family: var(--font-body);
    font-size: clamp(1rem, 2vw, 1.2rem);
    color: var(--text-2);
    line-height: 1.6;
    max-width: 520px;
    margin-bottom: 40px;
    opacity: 0;
    animation: fadeUp 0.7s ease forwards 0.4s;
}

.hero-links {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
    opacity: 0;
    animation: fadeUp 0.7s ease forwards 0.55s;
}

.hero-scroll-hint {
    position: absolute;
    bottom: 40px;
    left: 40px;
    display: flex;
    align-items: center;
    gap: 14px;
    color: var(--text-3);
    opacity: 0;
    animation: fadeIn 1s ease forwards 1.2s;
}

.scroll-line {
    width: 40px;
    height: 1px;
    background: var(--border-light);
    position: relative;
    overflow: hidden;
}

.scroll-line::after {
    content: '';
    position: absolute;
    left: -100%;
    top: 0;
    width: 100%;
    height: 100%;
    background: var(--accent);
    animation: scanLine 2s ease-in-out infinite;
}

/* ----------------------------------------------------------
   7. BUTTONS
   ---------------------------------------------------------- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.04em;
    padding: 10px 20px;
    border-radius: var(--radius);
    border: 1px solid transparent;
    cursor: pointer;
    transition: all var(--transition);
    white-space: nowrap;
}

.btn-outline {
    border-color: var(--border-light);
    color: var(--text-2);
    background: transparent;
}

.btn-outline:hover {
    border-color: var(--accent-dim);
    color: var(--accent);
    background: var(--accent-glow);
}

.btn-primary {
    background: var(--accent);
    color: var(--bg);
    font-weight: 500;
    border-color: var(--accent);
}

.btn-primary:hover {
    background: #c49540;
    border-color: #c49540;
}

.btn-lg {
    font-size: 0.85rem;
    padding: 14px 28px;
}

/* ----------------------------------------------------------
   8. ABOUT
   ---------------------------------------------------------- */
.section-about {
    background: var(--bg);
    border-top: 1px solid var(--border);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: start;
}

.about-text p {
    color: var(--text-2);
    margin-bottom: 20px;
    font-size: 1.05rem;
}

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

.about-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2px;
}

.stat {
    background: var(--bg-2);
    border: 1px solid var(--border);
    padding: 28px 24px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    transition: background var(--transition), border-color var(--transition);
}

.stat:hover {
    background: var(--surface);
    border-color: var(--border-light);
}

.stat-number {
    font-family: var(--font-display);
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--text);
    line-height: 1;
}

.stat-label {
    color: var(--text-3);
    font-size: 0.68rem;
    line-height: 1.4;
    letter-spacing: 0.04em;
}

/* ----------------------------------------------------------
   9. EXPERIENCE / TIMELINE
   ---------------------------------------------------------- */
.section-experience {
    background: var(--bg-2);
    border-top: 1px solid var(--border);
}

.timeline {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 0;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 1px;
    background: linear-gradient(to bottom, var(--border), var(--border-light), var(--border));
}

.timeline-item {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: 0 48px;
    padding: 40px 0 40px 32px;
    border-bottom: 1px solid var(--border);
    position: relative;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s ease, transform 0.5s ease;
}

.timeline-item.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Dot on the line */
.timeline-item::before {
    content: '';
    position: absolute;
    left: -4px;
    top: 48px;
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--bg-2);
    border: 2px solid var(--accent);
}

.timeline-meta {
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding-top: 4px;
}

.timeline-date {
    color: var(--text-3);
    font-size: 0.68rem;
    line-height: 1.5;
}

.badge {
    display: inline-flex;
    align-items: center;
    font-family: var(--font-mono);
    font-size: 0.6rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    padding: 3px 8px;
    border-radius: var(--radius);
    background: var(--surface-2);
    border: 1px solid var(--border-light);
    color: var(--text-3);
    width: fit-content;
}

.badge-primary {
    background: rgba(212, 168, 83, 0.1);
    border-color: var(--accent-dim);
    color: var(--accent);
}

.badge-muted {
    opacity: 0.6;
}

.timeline-role {
    font-family: var(--font-display);
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 4px;
}

.timeline-company {
    font-family: var(--font-body);
    font-size: 0.95rem;
    color: var(--accent);
    margin-bottom: 16px;
}

.location {
    color: var(--text-3);
}

.timeline-bullets {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 20px;
}

.timeline-bullets li {
    color: var(--text-2);
    font-size: 0.95rem;
    padding-left: 18px;
    position: relative;
    line-height: 1.6;
}

.timeline-bullets li::before {
    content: '—';
    position: absolute;
    left: 0;
    color: var(--text-3);
    font-size: 0.75rem;
    top: 3px;
}

/* ----------------------------------------------------------
   10. TAGS
   ---------------------------------------------------------- */
.timeline-tags,
.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.tag {
    font-family: var(--font-mono);
    font-size: 0.62rem;
    letter-spacing: 0.04em;
    padding: 3px 10px;
    border-radius: var(--radius);
    background: var(--bg-3);
    border: 1px solid var(--border);
    color: var(--text-3);
    transition: all var(--transition);
}

.tag:hover {
    border-color: var(--accent-dim);
    color: var(--accent);
    background: var(--accent-glow);
}

/* ----------------------------------------------------------
   11. PROJECTS
   ---------------------------------------------------------- */
.section-projects {
    background: var(--bg);
    border-top: 1px solid var(--border);
}

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

.project-card {
    background: var(--bg-2);
    border: 1px solid var(--border);
    padding: 36px 32px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    transition: background var(--transition), border-color var(--transition), transform var(--transition);
    opacity: 0;
    transform: translateY(16px);
}

.project-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.project-card:hover {
    background: var(--surface);
    border-color: var(--border-light);
    transform: translateY(-2px);
    z-index: 1;
    position: relative;
}

.project-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.project-number {
    color: var(--text-3);
    font-size: 0.65rem;
    letter-spacing: 0.08em;
}

.icon-link {
    color: var(--text-3);
    transition: color var(--transition);
    display: flex;
    align-items: center;
}

.icon-link:hover {
    color: var(--accent);
}

.project-title {
    font-family: var(--font-display);
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text);
    line-height: 1.2;
}

.project-desc {
    color: var(--text-2);
    font-size: 0.92rem;
    line-height: 1.65;
    flex: 1;
}

/* ----------------------------------------------------------
   12. SKILLS
   ---------------------------------------------------------- */
.section-skills {
    background: var(--bg-2);
    border-top: 1px solid var(--border);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 48px 80px;
}

.skill-group {
    opacity: 0;
    transform: translateY(16px);
    transition: opacity 0.5s ease, transform 0.5s ease;
}

.skill-group.visible {
    opacity: 1;
    transform: translateY(0);
}

.skill-group-title {
    color: var(--text-3);
    font-size: 0.68rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin-bottom: 24px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border);
}

.skill-list {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.skill-item {
    display: flex;
    align-items: center;
    gap: 14px;
}

.skill-name {
    font-family: var(--font-body);
    font-size: 0.9rem;
    color: var(--text-2);
    min-width: 160px;
    flex-shrink: 0;
}

.skill-bar {
    flex: 1;
    height: 2px;
    background: var(--border);
    border-radius: 2px;
    overflow: hidden;
}

.skill-fill {
    height: 100%;
    width: 0;
    border-radius: 2px;
    background: linear-gradient(90deg, var(--accent-dim), var(--accent));
    transition: width 1.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.skill-group.visible .skill-fill {
    width: var(--pct);
}

/* ----------------------------------------------------------
   13. CONTACT
   ---------------------------------------------------------- */
.section-contact {
    background: var(--bg);
    border-top: 1px solid var(--border);
    position: relative;
    overflow: hidden;
}

.section-contact::before {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -15%;
    width: 500px;
    height: 500px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(212, 168, 83, 0.05) 0%, transparent 65%);
    pointer-events: none;
}

.contact-inner {
    max-width: 700px;
}

.contact-title {
    margin-bottom: 20px;
}

.contact-sub {
    color: var(--text-2);
    font-size: 1.05rem;
    max-width: 520px;
    margin-bottom: 40px;
}

.contact-links {
    display: flex;
    flex-direction: column;
    gap: 16px;
    align-items: flex-start;
}

.contact-social {
    display: flex;
    gap: 12px;
}

/* ----------------------------------------------------------
   14. FOOTER
   ---------------------------------------------------------- */
.site-footer {
    border-top: 1px solid var(--border);
    padding: 28px 0;
    background: var(--bg);
}

.footer-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.footer-copy,
.footer-note {
    color: var(--text-3);
    font-size: 0.68rem;
    letter-spacing: 0.04em;
}

/* ----------------------------------------------------------
   15. ANIMATIONS
   ---------------------------------------------------------- */
@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes scanLine {
    0% {
        left: -100%;
    }

    50% {
        left: 100%;
    }

    100% {
        left: 100%;
    }
}

/* ----------------------------------------------------------
   16. RESPONSIVE
   ---------------------------------------------------------- */
@media (max-width: 900px) {
    :root {
        --section-gap: 80px;
    }

    .about-grid {
        grid-template-columns: 1fr;
        gap: 48px;
    }

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

    .skills-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .timeline-item {
        grid-template-columns: 1fr;
        gap: 12px;
        padding-left: 28px;
    }

    .timeline-meta {
        flex-direction: row;
        align-items: center;
        flex-wrap: wrap;
        gap: 10px;
    }
}

@media (max-width: 600px) {
    .container {
        padding: 0 20px;
    }

    .nav {
        padding: 16px 20px;
    }

    .hero {
        padding: 0 20px;
    }

    .hero-scroll-hint {
        left: 20px;
    }

    .hero-name {
        font-size: clamp(3rem, 14vw, 5rem);
    }

    .about-stats {
        grid-template-columns: 1fr;
    }

    .footer-inner {
        flex-direction: column;
        gap: 8px;
        text-align: center;
    }
}