/* Design System — Emre Bulut Portfolio
   Ground: a live, flowing video (magenta / violet / blue silk) shown at
   full intensity — only a thin dark-plum scrim rides on top of it, just
   enough for legible text everywhere. Light, near-white type and a bright
   orchid accent read against the dark scrim; a deeper plum carries solid
   fills (buttons, badges). Flat panels, no glass, no glow. Single-theme
   by choice: the video stays the star, not washed out behind it. */
:root {
    /* Color Palette */
    --bg: #1c0a1c;              /* dark plum-black — solid fallback / card ground */
    --surface: #2a1428;         /* card surface, a touch lighter for lift */
    --ink: #fbf3fa;             /* primary text — near-white */
    --ink-soft: #e4d3e8;        /* secondary text — light lavender */
    --text-main: var(--ink);
    --text-muted: #c7afcb;      /* tertiary / labels */
    --border: rgba(255, 255, 255, 0.18);
    --accent: #7a2e6b;          /* deep plum/magenta — solid fills: buttons, badges */
    --accent-bright: #f0a6ff;   /* bright orchid — text accents: links, names, labels */
    --accent-soft: rgba(122, 46, 107, 0.32);
    --accent-soft-border: rgba(240, 166, 255, 0.4);
    --ink-on-accent: #fdf6fb;   /* light text set on top of the accent fill */

    /* kept for compatibility with existing component names */
    --bg-dark: var(--bg);
    --bg-card: var(--surface);
    --primary: var(--accent);
    --accent-deep: #5c2350;

    /* Typography */
    --font-heading: 'Archivo', 'Segoe UI', sans-serif;
    --font-body: 'Public Sans', 'Segoe UI', sans-serif;
    --font-mono: 'IBM Plex Mono', 'Consolas', monospace;

    /* Spacing */
    --section-gap: 6rem;
    --container-width: 1200px;
}

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%; /* stop iOS auto-enlarging text on rotate */
    text-size-adjust: 100%;
}

body {
    background-color: var(--bg); /* solid fallback if the video can't load */
    color: var(--ink);
    font-family: var(--font-body);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-tap-highlight-color: transparent; /* no grey flash on iOS/Android tap */
}

a, button {
    -webkit-tap-highlight-color: transparent;
}

/* Live video ground: fixed behind everything. Only a thin dark scrim rides
   on top — the video stays vivid and visible, not washed out. */
.site-bg-video {
    position: fixed;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: -2;
}
.site-bg-overlay {
    position: fixed;
    inset: 0;
    z-index: -1;
    background: rgba(20, 6, 22, 0.44);
}

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.2s ease, border-color 0.2s ease;
}

ul {
    list-style: none;
}

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

/* Typography */
h1, h2, h3, h4 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.18;
    letter-spacing: -0.01em;
    color: var(--ink);
    text-wrap: balance;
}

h1 {
    font-size: clamp(2.4rem, 4.6vw, 3.4rem);
    font-weight: 800;
    letter-spacing: -0.02em;
}

h2 {
    font-size: 2.25rem;
    margin-bottom: 2rem;
    position: relative;
    display: inline-block;
}

h3 {
    font-size: 1.3rem;
    font-weight: 700;
}

p {
    color: var(--ink-soft);
    margin-bottom: 1rem;
}

/* Utilities */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 2rem;
}

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

.muted {
    color: var(--text-muted);
}

.name-ink { color: var(--ink); }
.name-accent { color: var(--accent-bright); }

/* Flat panel (was "glass" — now a plain bordered surface, no blur/glow) */
.glass-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 2rem;
    position: relative;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.18);
    transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}
.glass-card:hover {
    border-color: var(--accent-soft-border);
    box-shadow: 0 10px 26px -14px rgba(0, 0, 0, 0.45);
    transform: translateY(-2px);
}

/* Header & Nav */
.site-header {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(20, 6, 22, 0.55);
    backdrop-filter: saturate(1.1);
    -webkit-backdrop-filter: saturate(1.1);
    border-bottom: 1px solid transparent;
    padding: 1rem 0;
    padding-top: max(1rem, env(safe-area-inset-top));
    padding-left: env(safe-area-inset-left);
    padding-right: env(safe-area-inset-right);
    transition: border-color 0.3s ease, background 0.3s ease;
}
.site-header.scrolled {
    border-bottom-color: var(--border);
    background: rgba(20, 6, 22, 0.82);
}

.nav-wrap {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: var(--font-heading);
    font-size: 1.35rem;
    font-weight: 800;
    color: var(--ink);
}

.logo-mark {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    background: linear-gradient(135deg, var(--accent-bright), var(--accent));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 1.5rem;
    letter-spacing: 0.01em;
    filter: drop-shadow(0 2px 10px rgba(240, 166, 255, 0.35));
}

.main-nav {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.main-nav a {
    color: var(--ink-soft);
    font-size: 0.92rem;
    font-weight: 600;
    padding-bottom: 2px;
    border-bottom: 1px solid transparent;
    white-space: nowrap;
}

.main-nav a:hover {
    color: var(--accent-bright);
    border-bottom-color: var(--accent-bright);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.lang-toggle {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--ink-soft);
    padding: 4px 10px;
    border-radius: 6px;
    font-family: var(--font-mono);
    font-size: 0.78rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 4px;
}
.lang-toggle:hover {
    border-color: var(--accent-bright);
}
.lang-option {
    padding: 2px;
}
.lang-option.active {
    color: var(--accent-bright);
    font-weight: 700;
}
.lang-sep {
    opacity: 0.5;
}

/* Hero Section — a full-screen opening statement, not just a banner */
.hero {
    min-height: 100vh;
    min-height: 100dvh; /* iOS/Android address-bar-safe viewport height */
    display: flex;
    align-items: center;
    padding: 100px 0 40px;
    position: relative;
}

/* Scroll cue — the literal "press or scroll to move on" affordance */
.scroll-cue {
    position: absolute;
    left: 50%;
    bottom: 36px;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-muted);
    transition: color 0.2s ease;
    animation: scrollCueBounce 2.2s ease-in-out infinite;
}
.scroll-cue:hover {
    color: var(--accent-bright);
}
.scroll-cue-label {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.12em;
}
@keyframes scrollCueBounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(8px); }
}
@media (prefers-reduced-motion: reduce) {
    .scroll-cue { animation: none; }
}

.hero-grid {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
}

.hero-content {
    max-width: 640px;
    z-index: 10;
    text-align: center;
}

.hero-title {
    margin-bottom: 1.5rem;
}
.hero-title span:first-child {
    display: block;
    font-family: var(--font-body);
    font-size: 1.2rem;
    font-weight: 500;
    color: var(--text-muted);
    margin-bottom: 0.4rem;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
    justify-content: center;
}

.btn {
    display: inline-block;
    padding: 0.8rem 1.9rem;
    background: var(--accent);
    color: var(--ink-on-accent);
    border-radius: 8px;
    font-weight: 700;
    font-size: 0.95rem;
    border: 1px solid var(--accent);
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn:hover {
    background: var(--accent-deep);
    border-color: var(--accent-deep);
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--ink);
}
.btn-outline:hover {
    border-color: var(--accent-bright);
    color: var(--accent-bright);
}

/* About — plain editorial layout, no boxed tiles */
.about-layout {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 56px;
    align-items: start;
}

.about-bio {
    font-size: 1.08rem;
    color: var(--ink-soft);
    max-width: 62ch;
    margin-bottom: 0;
}

.about-facts {
    display: flex;
    flex-direction: column;
}

.about-fact {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 16px 0;
    border-bottom: 1px solid var(--border);
}
.about-fact:first-child { padding-top: 0; }

.about-fact dt {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-muted);
}
.about-fact dd {
    font-weight: 600;
    font-size: 1rem;
    color: var(--ink);
}

/* Experience / Timeline */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto 2rem;
}

.timeline-item {
    display: flex;
    margin-bottom: 3rem;
    position: relative;
}

.timeline-item:not(:last-child)::before {
    content: '';
    position: absolute;
    left: 40px;
    top: 0;
    bottom: -3rem;
    width: 1px;
    background: var(--border);
    z-index: 0;
}

.timeline-dot {
    width: 74px;
    height: 74px;
    background: var(--surface);
    border-radius: 50%;
    margin-right: 2rem;
    z-index: 2;
    border: 1px solid var(--border);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.18);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    color: var(--accent-bright);
    flex-shrink: 0;
    overflow: hidden;
}

.timeline-card {
    flex: 1;
}

.timeline-card h3 {
    margin-bottom: 0.2rem;
}

.timeline-card p.role {
    color: var(--ink);
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.timeline-card ul {
    margin-top: 1rem;
    padding-left: 1.2rem;
    color: var(--ink-soft);
}
.timeline-card li {
    margin-bottom: 0.5rem;
    list-style-type: disc;
}

.timeline-date {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--accent-bright);
    margin-bottom: 0.5rem;
    font-weight: 600;
}

/* Projects Grid */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 1.75rem;
    align-items: start;
}

.project-card {
    height: 100%;
    display: flex;
    flex-direction: column;
}

.project-card h3 {
    margin-bottom: 0.5rem;
    line-height: 1.3;
}

.project-card p {
    margin-bottom: 1rem;
    flex-grow: 1;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: auto;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
}

.tag {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    padding: 0.35em 0.75em;
    background: var(--accent-soft);
    color: var(--accent-bright);
    border-radius: 5px;
    white-space: nowrap;
}

/* Project Badge */
.project-badge {
    position: absolute;
    top: -12px;
    right: 20px;
    background: var(--accent);
    color: var(--ink-on-accent);
    font-size: 0.72rem;
    font-weight: 700;
    padding: 4px 12px;
    border-radius: 6px;
}

.project-date {
    font-size: 0.8rem;
    font-family: var(--font-mono);
    display: block;
    margin-bottom: 1rem;
}

.project-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-top: 1rem;
    color: var(--accent-bright);
    font-weight: 600;
    font-size: 0.9rem;
    align-self: flex-start;
}

/* Project detail toggle (Problem / Yaklaşım / Sonuç) */
.project-toggle {
    background: none;
    border: none;
    padding: 0;
    margin-top: 1rem;
    color: var(--accent-bright);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    align-self: flex-start;
}

.project-detail {
    display: none;
    margin: 1rem 0 0;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
    flex-direction: column;
    gap: 0.85rem;
}
.detail-row { margin: 0; }
.project-card.is-open .project-detail {
    display: flex;
}

.detail-row dt {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-muted);
    margin-bottom: 3px;
}
.detail-row dd {
    font-size: 0.9rem;
    color: var(--ink-soft);
    line-height: 1.55;
}

/* Mini projects */
.mini-projects-title {
    margin: 3rem 0 1.5rem;
    font-size: 1.15rem;
}

.mini-projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.25rem;
}

.mini-project {
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 1.25rem 1.5rem;
}
.mini-project h4 {
    margin: 0 0 0.4rem;
    font-size: 1rem;
    font-weight: 700;
}
.mini-project p {
    font-size: 0.88rem;
    margin-bottom: 0.75rem;
}

/* Interests */
.interest-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
}
.interest-chip {
    font-size: 0.85rem;
    padding: 0.55em 1em;
}

/* Skills */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.75rem;
}

.skill-card h3 {
    color: var(--ink);
    margin-bottom: 1rem;
    font-size: 1.05rem;
}

/* Contact / Footer */
.site-footer {
    border-top: 1px solid var(--border);
    text-align: center;
    padding: 3rem 0;
    margin-top: 4rem;
}

.contact-intro {
    font-size: 1.05rem;
    color: var(--ink-soft);
    margin-bottom: 2rem;
}

.contact-email {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 1.05rem;
    color: var(--accent-bright);
    margin-bottom: 1.75rem;
    padding-bottom: 2px;
    border-bottom: 1px solid var(--accent-soft-border);
    transition: color 0.2s ease, border-color 0.2s ease;
}
.contact-email:hover {
    color: var(--ink);
    border-color: var(--ink);
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.social-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 46px;
    height: 46px;
    border-radius: 50%;
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--ink);
    font-size: 1.1rem;
    transition: all 0.2s ease;
}

.social-icon:hover {
    border-color: var(--accent-bright);
    color: var(--accent-bright);
}

.footer-bottom {
    font-size: 0.88rem;
    color: var(--text-muted);
}

/* Animations — each section arrives as its own quiet moment */
.reveal {
    opacity: 0;
    transform: translateY(36px) scale(0.985);
    transition: opacity 0.9s cubic-bezier(0.16, 1, 0.3, 1), transform 0.9s cubic-bezier(0.16, 1, 0.3, 1);
}
.reveal.in-view {
    opacity: 1;
    transform: translateY(0) scale(1);
}

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    .reveal { opacity: 1; transform: none; transition: none; }
    * { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
    /* honor reduced-motion and save battery/data: freeze the video, keep the still backdrop */
    .site-bg-video { display: none; }
    .site-bg-overlay { background: var(--bg); }
}

/* Hamburger */
.hamburger {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    width: 44px;
    height: 44px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}
.hamburger span {
    width: 22px;
    height: 2px;
    background: var(--ink);
    border-radius: 2px;
    transition: 0.3s;
}

/* Scroll Top */
.scroll-top {
    position: fixed;
    bottom: max(24px, env(safe-area-inset-bottom));
    right: max(24px, env(safe-area-inset-right));
    width: 42px;
    height: 42px;
    border-radius: 50%;
    background: var(--accent);
    color: var(--ink-on-accent);
    border: none;
    font-size: 1.1rem;
    cursor: pointer;
    z-index: 90;
    opacity: 0;
    pointer-events: none;
    transform: translateY(10px);
    transition: all 0.3s ease;
    box-shadow: 0 6px 18px -6px rgba(0, 0, 0, 0.4);
}
.scroll-top.visible {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
}
.scroll-top:hover {
    background: var(--accent-deep);
}

/* Focus visibility */
a:focus-visible,
button:focus-visible {
    outline: 2px solid var(--accent-bright);
    outline-offset: 3px;
    border-radius: 4px;
}

/* Mobile Responsive */
@media (max-width: 900px) {
    .hero-grid {
        flex-direction: column;
        text-align: center;
    }
    .hero-actions {
        justify-content: center;
    }
    .timeline::before {
        left: 20px;
    }
    .timeline-dot {
        width: 40px;
        height: 40px;
        margin-right: 1rem;
        font-size: 1rem;
    }
    .about-layout {
        grid-template-columns: 1fr;
        gap: 32px;
    }
}

@media (max-width: 900px) {
    .main-nav {
        display: none;
    }
    .hamburger {
        display: flex;
    }
    .main-nav.open {
        display: flex;
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        max-height: calc(100vh - 72px);
        max-height: calc(100dvh - 72px);
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
        flex-direction: column;
        background: rgba(20, 6, 22, 0.94);
        padding: 20px 24px;
        border-bottom: 1px solid var(--border);
        gap: 16px;
    }
}