/* ═══════════════════════════════════════
   LEKU — Technical Editorial Theme
   Dark, precise, engineering-paper grid
   Pico CSS base with full visual override
   ═══════════════════════════════════════ */

:root {
    /* Palette */
    --bg: #0c0f16;
    --surface: #111520;
    --card: #171c28;
    --card-hover: #1c2234;
    --border: #242c40;
    --border-light: #1b2233;

    /* Text */
    --text: #e4e2dc;
    --text-muted: #7d8698;
    --text-faint: #4a5268;

    /* Accent — amber instrument display */
    --accent: #d4943a;
    --accent-hover: #e5a84d;
    --accent-glow: rgba(212, 148, 58, 0.15);
    --accent-subtle: rgba(212, 148, 58, 0.08);

    /* Typography */
    --font-heading: 'Syne', sans-serif;
    --font-body: 'Outfit', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;

    /* Grid background */
    --grid-color: rgba(36, 44, 64, 0.5);
    --grid-size: 60px;

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

    /* Override Pico */
    --pico-container-max-width: 1100px;
    --pico-background-color: var(--bg);
    --pico-color: var(--text);
    --pico-primary: var(--accent);
    --pico-primary-hover: var(--accent-hover);
    --pico-card-background-color: var(--card);
    --pico-card-border-color: var(--border);
    --pico-muted-color: var(--text-muted);
    --pico-h1-color: var(--text);
    --pico-h2-color: var(--text);
    --pico-h3-color: var(--text);
    --pico-border-color: var(--border);
    color-scheme: dark;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 5rem;
}

body {
    font-family: var(--font-body);
    background: var(--bg);
    color: var(--text);
    margin: 0;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}


/* ── Typography ────────────────────── */

h1, h2, h3, h4 {
    font-family: var(--font-heading);
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.1;
}

.mono {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    letter-spacing: 0.03em;
    text-transform: uppercase;
}

.section-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 2rem;
}


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

.site-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 1rem 0;
    background: transparent;
    transition: background 0.3s ease, backdrop-filter 0.3s ease;
}

.site-nav.scrolled {
    background: rgba(12, 15, 22, 0.88);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-light);
}

.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 2rem;
}

.nav-logo {
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 1.4rem;
    color: var(--text);
    text-decoration: none;
    letter-spacing: 0.08em;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-links a {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.2s ease;
    padding: 0;
    background: none;
    border: none;
}

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

.lang-btn {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--accent);
    background: var(--accent-subtle);
    border: 1px solid rgba(212, 148, 58, 0.25);
    padding: 0.35rem 0.75rem;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.lang-btn:hover {
    background: var(--accent-glow);
    border-color: rgba(212, 148, 58, 0.5);
}


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

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 8rem 2rem 4rem;
    overflow: hidden;
}

.grid-bg {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(var(--grid-color) 1px, transparent 1px),
        linear-gradient(90deg, var(--grid-color) 1px, transparent 1px);
    background-size: var(--grid-size) var(--grid-size);
    mask-image: radial-gradient(ellipse 70% 50% at 50% 50%, black 20%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse 70% 50% at 50% 50%, black 20%, transparent 70%);
    opacity: 0.6;
}

.hero::before {
    content: '';
    position: absolute;
    top: -40%;
    right: -15%;
    width: 70%;
    height: 90%;
    background: radial-gradient(circle, var(--accent-glow) 0%, transparent 60%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 1100px;
    margin: 0 auto;
    width: 100%;
}

.hero-label {
    display: inline-block;
    color: var(--accent);
    margin-bottom: 1.5rem;
    opacity: 0;
    animation: fadeUp 0.8s var(--ease-out) 0.2s forwards;
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 800;
    color: var(--text);
    margin: 0 0 1.5rem;
    max-width: 700px;
    opacity: 0;
    animation: fadeUp 0.8s var(--ease-out) 0.4s forwards;
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.15rem);
    color: var(--text-muted);
    max-width: 520px;
    line-height: 1.7;
    margin: 0 0 2.5rem;
    opacity: 0;
    animation: fadeUp 0.8s var(--ease-out) 0.6s forwards;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    opacity: 0;
    animation: fadeUp 0.8s var(--ease-out) 0.8s forwards;
}


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

.btn-primary,
.btn-ghost {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 0.85rem 2rem;
    border-radius: 4px;
    text-decoration: none;
    transition: all 0.25s ease;
}

.btn-primary {
    color: var(--bg);
    background: var(--accent);
    border: 1px solid var(--accent);
}

.btn-primary:hover {
    background: var(--accent-hover);
    border-color: var(--accent-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 20px var(--accent-glow);
}

.btn-ghost {
    color: var(--text-muted);
    background: transparent;
    border: 1px solid var(--border);
}

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

.btn-lg {
    padding: 1rem 2.5rem;
    font-size: 0.85rem;
}


/* ── Scroll Hint ───────────────────── */

.scroll-hint {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    opacity: 0;
    animation: fadeIn 1s var(--ease-out) 1.2s forwards;
}

.scroll-hint .mono {
    color: var(--text-faint);
    font-size: 0.65rem;
    letter-spacing: 0.15em;
}

.scroll-line {
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, var(--text-faint), transparent);
    animation: scrollPulse 2s ease-in-out infinite;
}


/* ── Sections (shared) ─────────────── */

section:not(.hero) {
    padding: 6rem 0;
}

.section-header {
    margin-bottom: 3rem;
}

.section-label {
    display: block;
    color: var(--accent);
    margin-bottom: 0.75rem;
}

.section-header h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    margin: 0;
}


/* ── Services ──────────────────────── */

.services {
    background: var(--surface);
    border-top: 1px solid var(--border-light);
    border-bottom: 1px solid var(--border-light);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.service-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 2rem;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--accent);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s var(--ease-out);
}

.service-card:hover {
    background: var(--card-hover);
    transform: translateY(-2px);
}

.service-card:hover::before {
    transform: scaleX(1);
}

.card-number {
    display: block;
    color: var(--accent);
    font-size: 0.75rem;
    margin-bottom: 1rem;
    opacity: 0.7;
}

.service-card h3 {
    font-size: 1.3rem;
    margin: 0 0 0.75rem;
}

.service-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.6;
    margin: 0 0 1.25rem;
}

.card-tags,
.credential-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    list-style: none;
    padding: 0;
    margin: 0;
}

.card-tags li,
.credential-tags li {
    font-size: 0.65rem;
    color: var(--text-faint);
    padding: 0.25rem 0.6rem;
    border: 1px solid var(--border);
    border-radius: 3px;
}


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

.about-statement {
    font-family: var(--font-body);
    font-size: clamp(1.1rem, 2.5vw, 1.35rem);
    font-style: normal;
    color: var(--text);
    max-width: 700px;
    line-height: 1.6;
    margin: 0 0 3rem;
    padding: 0 0 0 1.5rem;
    border-left: 2px solid var(--accent);
    border-right: none;
    border-top: none;
    border-bottom: none;
    background: none;
}

.partners-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.partner-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 2rem;
}

.partner-header {
    display: flex;
    align-items: baseline;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

.partner-header h3 {
    font-size: 1.4rem;
    margin: 0;
}

.partner-degree {
    color: var(--accent);
    font-size: 0.7rem;
}

.partner-focus {
    color: var(--accent) !important;
    font-size: 0.7rem !important;
    margin: 0 0 1rem !important;
}

.partner-bio {
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.6;
}

.credential-tags {
    margin-top: 1.25rem;
}


/* ── Contact ───────────────────────── */

.contact {
    text-align: center;
    background: var(--surface);
    border-top: 1px solid var(--border-light);
}

.contact .section-header {
    text-align: center;
}

.contact-desc {
    font-size: 1.15rem;
    color: var(--text-muted);
    margin-bottom: 2rem;
}

.contact-actions {
    margin-bottom: 1.5rem;
}

.contact-location {
    color: var(--text-faint);
    font-size: 0.75rem;
}


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

.site-footer {
    border-top: 1px solid var(--border-light);
    padding: 2rem 0;
}

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

.footer-inner .mono {
    color: var(--text-faint);
    font-size: 0.7rem;
}

.footer-inner .nav-logo {
    font-size: 1rem;
    color: var(--text-faint);
}


/* ── Animations ────────────────────── */

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

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

@keyframes scrollPulse {
    0%, 100% { opacity: 0.3; }
    50% { opacity: 0.8; }
}

.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out);
}

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


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

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

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

@media (max-width: 640px) {
    .nav-links {
        gap: 1rem;
    }

    .nav-links a {
        font-size: 0.7rem;
    }

    section:not(.hero) {
        padding: 4rem 0;
    }

    .hero {
        padding: 6rem 1.5rem 3rem;
    }

    .section-inner {
        padding: 0 1.5rem;
    }

    .hero-cta {
        flex-direction: column;
    }

    .hero-cta a {
        text-align: center;
    }
}

/* ── Hamburger button ─────────────── */

.nav-right {
    display: flex;
    align-items: center;
    position: relative;
}

.hamburger {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 32px;
    height: 32px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    z-index: 110;
}

.hamburger span {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--text-muted);
    border-radius: 1px;
    transition: all 0.3s ease;
}

.hamburger[aria-expanded="true"] span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.hamburger[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
}

.hamburger[aria-expanded="true"] span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

@media (max-width: 420px) {
    .nav-inner,
    .section-inner {
        padding: 0 1rem;
    }

    .hero {
        padding: 5rem 1rem 3rem;
    }

    .hamburger {
        display: flex;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        right: 1rem;
        background: rgba(17, 21, 32, 0.96);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        border: 1px solid var(--border);
        border-radius: 8px;
        padding: 1rem 1.5rem;
        flex-direction: column;
        gap: 1rem;
        min-width: 160px;
    }

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