/* ============================================================
   app.css — ternis.dev
   Dark, minimal, sharp.
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600&family=JetBrains+Mono:wght@400;500&display=swap');

/* ── Custom Properties ──────────────────────────────────────── */
:root {
    --bg:         #0a0a0a;
    --bg-2:       #111111;
    --bg-3:       #1a1a1a;
    --border:     rgba(255, 255, 255, 0.08);
    --text:       #f0f0f0;
    --text-muted: #666666;
    --text-dim:   #3a3a3a;
    --accent:     #e8e8e8;
    --accent-hi:  #ffffff;
    --mono:       'JetBrains Mono', monospace;

    --transition: 0.2s ease;
    --radius:     4px;
    --radius-lg:  12px;
}

/* ── Selection ──────────────────────────────────────────────── */
::selection {
    background-color: var(--accent-hi);
    color: var(--bg);
}

::-moz-selection {
    background-color: var(--accent-hi);
    color: var(--bg);
}

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

html {
    scroll-behavior: smooth;
    scrollbar-width: none; /* Firefox */
    -ms-overflow-style: none; /* IE / Edge */
}

html::-webkit-scrollbar,
body::-webkit-scrollbar {
    display: none; /* Chrome, Safari, Opera */
    width: 0;
    height: 0;
}

body {
    font-family: 'Inter', system-ui, sans-serif;
    background-color: var(--bg);
    color: var(--text);
    overflow-x: hidden;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* ── Utility ────────────────────────────────────────────────── */
.sr-only {
    position: absolute;
    width: 1px; height: 1px;
    overflow: hidden;
    clip: rect(0,0,0,0);
    white-space: nowrap;
}

.mono { font-family: var(--mono); }

/* ── Navigation ─────────────────────────────────────────────── */
.site-nav {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 200;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 5%;
    height: 64px;
    background: rgba(10, 10, 10, 0.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    transition: border-color var(--transition);
}

.site-nav.scrolled {
    border-bottom-color: rgba(255, 255, 255, 0.12);
}

.nav-logo {
    font-family: var(--mono);
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--accent-hi);
    text-decoration: none;
    letter-spacing: 0.02em;
}

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

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

.nav-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 400;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    transition: color var(--transition);
}

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

.nav-cta {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--bg) !important;
    background: var(--accent-hi);
    padding: 0.45rem 1.1rem;
    border-radius: var(--radius);
    text-transform: uppercase !important;
    letter-spacing: 0.06em !important;
    transition: background var(--transition), color var(--transition) !important;
}

.nav-cta:hover {
    background: var(--text-muted) !important;
    color: var(--bg) !important;
}

/* ── Language switcher ──────────────────────────────────────── */
.lang-switch {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    font-family: var(--mono);
    font-size: 0.68rem;
    letter-spacing: 0.1em;
}

.lang-switch a {
    color: var(--text-dim);
    text-decoration: none;
    padding: 0.2rem 0.35rem;
    border-radius: 2px;
    transition: color var(--transition);
    text-transform: uppercase;
}

.lang-switch a.active { color: var(--accent-hi); }

.lang-switch a:hover { color: var(--text-muted); }

.lang-switch span { color: var(--text-dim); }

/* Active nav section link */
.nav-links a.active { color: var(--accent-hi); }

/* Mobile nav toggle */
.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    color: var(--text);
    flex-direction: column;
    gap: 5px;
}

.nav-toggle span {
    display: block;
    width: 22px;
    height: 1.5px;
    background: currentColor;
    transition: transform var(--transition), opacity var(--transition);
}

/* ── Page layout ─────────────────────────────────────────────── */
main { padding-top: 64px; }

section {
    padding: 7rem 5%;
    border-bottom: 1px solid var(--border);
}

section:last-of-type { border-bottom: none; }

.section-label {
    font-family: var(--mono);
    font-size: 0.7rem;
    font-weight: 500;
    color: var(--text-muted);
    letter-spacing: 0.15em;
    text-transform: uppercase;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.section-label::before {
    content: '';
    display: inline-block;
    width: 20px;
    height: 1px;
    background: var(--text-dim);
}

/* ── Hero ───────────────────────────────────────────────────── */
#hero {
    min-height: calc(100vh - 64px);
    display: flex;
    flex-direction: column;
    justify-content: center;
    border-bottom: 1px solid var(--border);
    padding: 5rem 5% 5rem;
}

.hero-eyebrow {
    font-family: var(--mono);
    font-size: 0.75rem;
    color: var(--text-muted);
    letter-spacing: 0.14em;
    text-transform: uppercase;
    margin-bottom: 2rem;
}

.hero-heading {
    font-size: clamp(2.8rem, 6vw, 5.5rem);
    font-weight: 300;
    line-height: 1.05;
    letter-spacing: -0.02em;
    color: var(--accent-hi);
    max-width: 14ch;
    margin-bottom: 2rem;
}

.hero-heading strong {
    font-weight: 600;
    display: block;
}

.hero-sub {
    font-size: 1.05rem;
    color: var(--text-muted);
    max-width: 480px;
    line-height: 1.75;
    margin-bottom: 3rem;
}

.hero-actions {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.hero-meta {
    margin-top: auto;
    padding-top: 4rem;
    display: flex;
    gap: 3rem;
    border-top: 1px solid var(--border);
}

.hero-meta-item {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.hero-meta-label {
    font-family: var(--mono);
    font-size: 0.65rem;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.hero-meta-value {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* ── Buttons ────────────────────────────────────────────────── */
.btn {
    display: inline-block;
    text-decoration: none;
    font-size: 0.82rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    border-radius: var(--radius);
    padding: 0.65rem 1.4rem;
    transition: background var(--transition), color var(--transition), border-color var(--transition);
    cursor: pointer;
    border: 1px solid transparent;
}

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

.btn-primary:hover {
    background: var(--text-muted);
    border-color: var(--text-muted);
    color: var(--bg);
}

.btn-ghost {
    background: transparent;
    color: var(--text-muted);
    border-color: var(--border);
}

.btn-ghost:hover {
    color: var(--accent-hi);
    border-color: rgba(255,255,255,0.2);
}

/* ── Services ───────────────────────────────────────────────── */
#services .services-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1px;
    background: var(--border);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    margin-top: 3rem;
}

.service-card {
    background: var(--bg);
    padding: 2.5rem;
    transition: background var(--transition);
}

.service-card:hover { background: var(--bg-2); }

.service-num {
    font-family: var(--mono);
    font-size: 0.65rem;
    color: var(--text-dim);
    letter-spacing: 0.1em;
    margin-bottom: 1.5rem;
}

.service-title {
    font-size: 1.2rem;
    font-weight: 500;
    color: var(--accent-hi);
    margin-bottom: 0.75rem;
    letter-spacing: -0.01em;
}

.service-desc {
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

.service-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
}

.tag {
    font-family: var(--mono);
    font-size: 0.65rem;
    color: var(--text-dim);
    border: 1px solid var(--text-dim);
    padding: 0.2rem 0.5rem;
    border-radius: 2px;
    letter-spacing: 0.05em;
}

/* ── About ──────────────────────────────────────────────────── */
#about .about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 5rem;
    align-items: start;
    margin-top: 3rem;
}

.about-body {
    position: sticky;
    top: calc(64px + 3rem);
    align-self: start;
}

.about-heading {
    font-size: clamp(1.8rem, 3.5vw, 2.8rem);
    font-weight: 300;
    line-height: 1.15;
    letter-spacing: -0.02em;
    color: var(--accent-hi);
    margin-bottom: 1.5rem;
}

.about-body p {
    font-size: 0.95rem;
    color: var(--text-muted);
    line-height: 1.8;
    margin-bottom: 1rem;
}

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

.about-facts {
    display: flex;
    flex-direction: column;
    gap: 1px;
    background: var(--border);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.about-fact {
    background: var(--bg-2);
    padding: 1.5rem 1.75rem;
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 1rem;
}

.about-fact:hover { background: var(--bg-3); }

.fact-label {
    font-family: var(--mono);
    font-size: 0.72rem;
    color: var(--text-muted);
    letter-spacing: 0.05em;
}

.fact-value {
    font-size: 0.85rem;
    color: var(--accent-hi);
    text-align: right;
}

.fact-value a {
    color: inherit;
    text-decoration: none;
    border-bottom: 1px solid var(--text-dim);
    transition: border-color var(--transition);
}

.fact-value a:hover { border-color: var(--text-muted); }

/* ── Portfolio ──────────────────────────────────────────────── */
#portfolio .portfolio-list {
    margin-top: 3rem;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1px;
    background: var(--border);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.portfolio-item {
    background: var(--bg);
    padding: 2rem 2.25rem;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1.5rem;
    text-decoration: none;
    color: inherit;
    transition: background var(--transition);
    height: 100%;
}

.portfolio-item:hover { background: var(--bg-2); }

.portfolio-item-inner {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    flex: 1;
}

.portfolio-name {
    font-size: 1.05rem;
    font-weight: 500;
    color: var(--accent-hi);
    letter-spacing: -0.01em;
}

.portfolio-desc {
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.6;
}

.portfolio-arrow {
    font-size: 1.1rem;
    color: var(--text-dim);
    transition: color var(--transition), transform var(--transition);
    margin-top: 0.15rem;
    flex-shrink: 0;
}

.portfolio-item:hover .portfolio-arrow {
    color: var(--accent-hi);
    transform: translateX(4px);
}

.portfolio-item:last-child:nth-child(odd) {
    grid-column: 1 / -1;
    justify-content: center;
    text-align: center;
    padding: 1.5rem 2rem;
}

.portfolio-item:last-child:nth-child(odd) .portfolio-item-inner {
    align-items: center;
}

/* ── Contact ─────────────────────────────────────────────────── */
#contact {
    border-bottom: none;
    background: var(--bg-2);
}

.contact-inner {
    max-width: 600px;
}

.contact-heading {
    font-size: clamp(2rem, 4vw, 3.2rem);
    font-weight: 300;
    line-height: 1.1;
    letter-spacing: -0.02em;
    color: var(--accent-hi);
    margin-bottom: 1rem;
}

.contact-heading strong { font-weight: 600; }

.contact-sub {
    font-size: 0.95rem;
    color: var(--text-muted);
    line-height: 1.75;
    margin-bottom: 2.5rem;
}

.contact-links {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1px;
    background: var(--border);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    margin-top: 3rem;
}

.contact-link-row {
    background: var(--bg-3);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.35rem 1.75rem;
    text-decoration: none;
    color: inherit;
    transition: background var(--transition);
    gap: 1rem;
}

.contact-link-row:hover { background: var(--bg); }

.contact-link-label {
    font-family: var(--mono);
    font-size: 0.7rem;
    color: var(--text-muted);
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.contact-link-value {
    font-size: 0.88rem;
    color: var(--accent-hi);
}

/* ── Footer ─────────────────────────────────────────────────── */
.site-footer {
    min-height: 50vh;
    background: var(--bg);
    border-top: 1px solid var(--border);
    padding: 6rem 5% 3rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    gap: 4rem;
}

.footer-top {
    display: grid;
    grid-template-columns: 1.2fr 2fr;
    gap: 4rem;
    align-items: flex-start;
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    max-width: 380px;
}

.footer-logo {
    font-family: var(--mono);
    font-size: 1.4rem;
    font-weight: 500;
    color: var(--accent-hi);
    text-decoration: none;
    letter-spacing: 0.02em;
}

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

.footer-tagline {
    font-size: 0.92rem;
    color: var(--text-muted);
    line-height: 1.65;
}

.footer-entity {
    font-size: 0.72rem;
    color: var(--text-dim);
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.footer-nav-cols {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2.5rem;
}

.footer-col {
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
}

.footer-col-title {
    font-size: 0.68rem;
    color: var(--text-dim);
    letter-spacing: 0.12em;
    text-transform: uppercase;
    margin-bottom: 0.25rem;
}

.footer-col a {
    font-size: 0.85rem;
    color: var(--text-muted);
    text-decoration: none;
    transition: color var(--transition);
}

.footer-col a:hover {
    color: var(--accent-hi);
}

.footer-bottom {
    padding-top: 2rem;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.footer-copy {
    font-family: var(--mono);
    font-size: 0.72rem;
    color: var(--text-dim);
    letter-spacing: 0.04em;
}

.footer-bottom-links {
    display: flex;
    gap: 1.5rem;
}

.footer-bottom-links a {
    font-family: var(--mono);
    font-size: 0.72rem;
    color: var(--text-dim);
    text-decoration: none;
    transition: color var(--transition);
}

.footer-bottom-links a:hover {
    color: var(--text-muted);
}

/* ── Responsive ─────────────────────────────────────────────── */
@media (max-width: 768px) {
    .nav-links { display: none; }
    .nav-links.open {
        display: flex;
        flex-direction: column;
        position: fixed;
        top: 64px; left: 0; right: 0;
        background: var(--bg);
        border-bottom: 1px solid var(--border);
        padding: 1.5rem 5%;
        gap: 1.25rem;
        z-index: 199;
    }
    .nav-toggle { display: flex; }

    #services .services-grid { grid-template-columns: 1fr; }
    #about .about-grid { grid-template-columns: 1fr; gap: 2.5rem; }
    .about-body { position: static; }

    .hero-meta { flex-wrap: wrap; gap: 1.5rem; }

    #portfolio .portfolio-list { grid-template-columns: 1fr; }
    .portfolio-item:last-child:nth-child(odd) {
        grid-column: auto;
        text-align: left;
        justify-content: space-between;
    }
    .portfolio-item:last-child:nth-child(odd) .portfolio-item-inner {
        align-items: flex-start;
    }

    .contact-links { grid-template-columns: 1fr; }

    .site-footer {
        padding: 4.5rem 5% 2.5rem;
        min-height: auto;
        gap: 3rem;
    }
    .footer-top {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    .footer-nav-cols {
        grid-template-columns: 1fr 1fr;
        gap: 2.5rem;
    }
    .footer-bottom {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
}

/* ── Animations ─────────────────────────────────────────────── */
@keyframes fadeUp {
    from { opacity: 0; transform: translateY(16px); }
    to   { opacity: 1; transform: translateY(0); }
}

.animate-in {
    animation: fadeUp 0.5s ease forwards;
}

/* ── Scroll to Top & Circular Progress Indicator ───────────── */
.scroll-top-btn {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: rgba(17, 17, 17, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: none;
    outline: none;
    color: var(--accent-hi);
    cursor: pointer;
    z-index: 99;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(12px) scale(0.9);
    transition: opacity var(--transition), transform var(--transition), visibility var(--transition), background-color var(--transition);
}

.scroll-top-btn.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

.scroll-top-btn:hover {
    background: rgba(26, 26, 26, 0.95);
}

.scroll-top-btn:hover .scroll-ring-bg {
    stroke: rgba(255, 255, 255, 0.2);
}

.scroll-progress-ring {
    position: absolute;
    top: 0;
    left: 0;
    width: 44px;
    height: 44px;
    transform: rotate(-90deg);
    pointer-events: none;
}

.scroll-ring-bg {
    stroke: rgba(255, 255, 255, 0.1);
    transition: stroke var(--transition);
}

.scroll-ring-fill {
    stroke: var(--accent-hi);
    stroke-linecap: round;
    transition: stroke-dashoffset 0.1s linear;
}

.scroll-arrow {
    font-size: 1rem;
    line-height: 1;
    color: var(--accent-hi);
    transition: transform var(--transition);
    user-select: none;
}

.scroll-top-btn:hover .scroll-arrow {
    transform: translateY(-2px);
}

@media (max-width: 768px) {
    .scroll-top-btn {
        bottom: 1.5rem;
        right: 1.5rem;
    }
}