/* ============================================================
   IVAN KRIŠTO — PORTFOLIO DESIGN SYSTEM
   Premium, professional dark theme (navy / sapphire)
   Shared core: tokens, base, nav, buttons, forms, footer
   ============================================================ */

:root {
    /* --- Surfaces (deep navy-slate) --- */
    --bg: #080b13;
    --bg-2: #0c111c;
    --bg-3: #111826;
    --surface: #0f1622;
    --surface-2: #141d2c;
    --card: rgba(255, 255, 255, 0.025);
    --card-hover: rgba(255, 255, 255, 0.05);

    /* --- Text --- */
    --text: #f3f6fc;
    --text-2: #aeb9cc;
    --text-muted: #6d7894;

    /* --- Accent (sapphire → cyan, "data & cloud") --- */
    --accent: #3b82f6;
    --accent-bright: #38bdf8;
    --accent-cyan: #22d3ee;
    --accent-grad: linear-gradient(135deg, #3b82f6 0%, #22d3ee 100%);
    --accent-soft: rgba(59, 130, 246, 0.12);
    --accent-line: rgba(59, 130, 246, 0.28);

    /* --- Status --- */
    --ok: #34d399;
    --ok-soft: rgba(52, 211, 153, 0.1);
    --ok-line: rgba(52, 211, 153, 0.25);

    /* --- Lines --- */
    --border: rgba(255, 255, 255, 0.07);
    --border-2: rgba(255, 255, 255, 0.14);

    /* --- Type --- */
    --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-display: 'Space Grotesk', 'Inter', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    /* --- Metrics --- */
    --container: 1180px;
    --section-pad: 120px;
    --nav-h: 72px;

    --radius-sm: 10px;
    --radius: 14px;
    --radius-lg: 22px;
    --radius-xl: 28px;

    --t-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --t: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    --t-spring: 0.6s cubic-bezier(0.34, 1.4, 0.5, 1);

    --shadow-sm: 0 4px 16px rgba(0, 0, 0, 0.35);
    --shadow: 0 16px 48px rgba(0, 0, 0, 0.45);
    --shadow-lg: 0 30px 80px rgba(0, 0, 0, 0.55);
    --glow: 0 0 60px rgba(59, 130, 246, 0.18);
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 90px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    overflow-x: hidden;
}

/* Ambient page glow */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    z-index: -1;
    background:
        radial-gradient(60% 50% at 85% -5%, rgba(59, 130, 246, 0.10) 0%, transparent 60%),
        radial-gradient(45% 45% at 5% 25%, rgba(34, 211, 238, 0.06) 0%, transparent 60%);
    pointer-events: none;
}

a { text-decoration: none; color: inherit; transition: color var(--t-fast); }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }
button { border: none; background: none; cursor: pointer; font-family: inherit; }
input, textarea { font-family: inherit; }

h1, h2, h3, h4 {
    font-family: var(--font-display);
    font-weight: 600;
    letter-spacing: -0.02em;
    line-height: 1.15;
    color: var(--text);
}

/* Layout */
.container {
    width: 100%;
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 28px;
}

.section { padding: var(--section-pad) 0; position: relative; }
.section--tint { background: linear-gradient(180deg, var(--bg-2), var(--bg)); }

.text-gradient {
    background: var(--accent-grad);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Eyebrow tag */
.section-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 14px;
    background: var(--accent-soft);
    border: 1px solid var(--accent-line);
    border-radius: 100px;
    font-size: 0.74rem;
    font-weight: 600;
    color: var(--accent-bright);
    text-transform: uppercase;
    letter-spacing: 1.6px;
    margin-bottom: 18px;
}
.section-tag::before {
    content: '';
    width: 6px; height: 6px;
    border-radius: 50%;
    background: var(--accent-bright);
    box-shadow: 0 0 10px var(--accent-bright);
}

.section-header { text-align: center; max-width: 640px; margin: 0 auto 64px; }
.section-title {
    font-size: clamp(2rem, 4vw, 2.9rem);
    font-weight: 700;
    margin-bottom: 16px;
}
.section-subtitle { font-size: 1.08rem; color: var(--text-2); }

/* ============================================================
   NAVIGATION
   ============================================================ */
.navbar {
    position: fixed;
    inset: 0 0 auto 0;
    height: var(--nav-h);
    z-index: 1000;
    display: flex;
    align-items: center;
    transition: background var(--t), border-color var(--t), height var(--t);
    border-bottom: 1px solid transparent;
}
.navbar.scrolled {
    height: 62px;
    background: rgba(8, 11, 19, 0.72);
    backdrop-filter: blur(18px) saturate(140%);
    -webkit-backdrop-filter: blur(18px) saturate(140%);
    border-bottom: 1px solid var(--border);
}
.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 28px;
}
.nav-logo {
    display: flex;
    align-items: center;
    gap: 11px;
    font-family: var(--font-display);
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text);
    letter-spacing: -0.01em;
}
.logo-mark {
    display: grid;
    place-items: center;
    width: 38px;
    height: 38px;
    border-radius: 11px;
    background: var(--accent-grad);
    color: #fff;
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 0.92rem;
    box-shadow: 0 6px 18px rgba(59, 130, 246, 0.4);
}
.nav-logo .logo-sub {
    display: block;
    font-family: var(--font);
    font-size: 0.68rem;
    font-weight: 500;
    color: var(--text-muted);
    letter-spacing: 0.5px;
    margin-top: 1px;
}
.nav-menu { display: flex; align-items: center; gap: 4px; }
.nav-link {
    padding: 8px 16px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-2);
    border-radius: 100px;
    transition: all var(--t-fast);
}
.nav-link:hover { color: var(--text); }
.nav-link.active { color: var(--text); background: var(--card-hover); }

.nav-right { display: flex; align-items: center; gap: 18px; }
.nav-cta {
    padding: 10px 22px;
    background: var(--accent-grad);
    color: #fff;
    font-size: 0.88rem;
    font-weight: 600;
    border-radius: 100px;
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.32);
    transition: transform var(--t-fast), box-shadow var(--t-fast);
}
.nav-cta:hover { transform: translateY(-2px); box-shadow: 0 10px 28px rgba(59, 130, 246, 0.45); }

.nav-toggle { display: none; flex-direction: column; gap: 5px; padding: 6px; z-index: 1001; }
.nav-toggle span { width: 24px; height: 2px; background: var(--text); border-radius: 2px; transition: all var(--t-fast); }
.nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 14px 26px;
    font-size: 0.94rem;
    font-weight: 600;
    border-radius: 100px;
    transition: all var(--t-fast);
    cursor: pointer;
    white-space: nowrap;
}
.btn svg { transition: transform var(--t-fast); }
.btn-primary {
    background: var(--accent-grad);
    color: #fff;
    box-shadow: 0 8px 26px rgba(59, 130, 246, 0.35);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 34px rgba(59, 130, 246, 0.5); }
.btn-primary:hover svg { transform: translateX(4px); }
.btn-outline {
    background: rgba(255, 255, 255, 0.02);
    color: var(--text);
    border: 1px solid var(--border-2);
}
.btn-outline:hover { border-color: var(--accent); color: var(--accent-bright); background: var(--accent-soft); transform: translateY(-2px); }
.btn-lg { padding: 17px 34px; font-size: 1rem; }
.btn-full { width: 100%; }

/* ============================================================
   PAGE HEADER (sub-pages)
   ============================================================ */
.page-header {
    position: relative;
    padding: calc(var(--nav-h) + 80px) 0 70px;
    text-align: center;
    overflow: hidden;
    border-bottom: 1px solid var(--border);
}
.page-header-bg { position: absolute; inset: 0; z-index: 0; }
.page-header-bg .hero-gradient {
    position: absolute; inset: 0;
    background:
        radial-gradient(50% 60% at 50% 0%, rgba(59, 130, 246, 0.16) 0%, transparent 60%),
        radial-gradient(40% 50% at 80% 30%, rgba(34, 211, 238, 0.08) 0%, transparent 60%);
}
.page-header-bg .hero-grid {
    position: absolute; inset: 0;
    background-image:
        linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
    background-size: 54px 54px;
    mask-image: radial-gradient(ellipse 65% 70% at 50% 0%, #000 20%, transparent 75%);
    -webkit-mask-image: radial-gradient(ellipse 65% 70% at 50% 0%, #000 20%, transparent 75%);
}
.page-header-content { position: relative; z-index: 1; }
.page-title {
    font-size: clamp(2.4rem, 6vw, 3.6rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    margin-bottom: 14px;
}
.page-subtitle { font-size: 1.12rem; color: var(--text-2); max-width: 560px; margin: 0 auto; }

/* ============================================================
   FORMS
   ============================================================ */
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-group { margin-bottom: 16px; }
.form-group label {
    display: block;
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--text-2);
    margin-bottom: 7px;
}
.form-group input,
.form-group textarea {
    width: 100%;
    padding: 14px 16px;
    background: var(--bg-3);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-size: 0.95rem;
    transition: all var(--t-fast);
    outline: none;
}
.form-group input::placeholder,
.form-group textarea::placeholder { color: var(--text-muted); }
.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.16);
    background: var(--surface);
}
.form-group textarea { resize: vertical; min-height: 130px; }

/* ============================================================
   CTA BAND
   ============================================================ */
.cta-band {
    position: relative;
    overflow: hidden;
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    background:
        radial-gradient(120% 140% at 100% 0%, rgba(59, 130, 246, 0.18) 0%, transparent 55%),
        var(--surface);
    padding: 64px;
    text-align: center;
}
.cta-band h2 { font-size: clamp(1.8rem, 3.5vw, 2.5rem); margin-bottom: 14px; }
.cta-band p { color: var(--text-2); font-size: 1.08rem; max-width: 520px; margin: 0 auto 32px; }
.cta-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
    background: var(--bg-2);
    border-top: 1px solid var(--border);
    padding: 72px 0 32px;
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1.5fr;
    gap: 56px;
    margin-bottom: 48px;
}
.footer-brand p { color: var(--text-2); font-size: 0.92rem; margin-top: 18px; max-width: 340px; }
.footer-social { display: flex; gap: 10px; margin-top: 22px; }
.footer-social a {
    display: grid; place-items: center;
    width: 42px; height: 42px;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-2);
    transition: all var(--t-fast);
}
.footer-social a:hover { color: #fff; border-color: var(--accent); background: var(--accent-soft); transform: translateY(-3px); }
.footer-links h4, .footer-contact h4 {
    font-family: var(--font);
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1.2px;
    color: var(--text-muted);
    margin-bottom: 20px;
}
.footer-links ul { display: flex; flex-direction: column; gap: 12px; }
.footer-links a { font-size: 0.92rem; color: var(--text-2); }
.footer-links a:hover { color: var(--accent-bright); }
.footer-contact ul { display: flex; flex-direction: column; gap: 14px; }
.footer-contact li { display: flex; align-items: center; gap: 11px; font-size: 0.92rem; color: var(--text-2); }
.footer-contact li svg { flex-shrink: 0; color: var(--accent); }
.footer-contact a:hover { color: var(--accent-bright); }
.footer-bottom {
    border-top: 1px solid var(--border);
    padding-top: 26px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
}
.footer-bottom p { font-size: 0.84rem; color: var(--text-muted); }
.footer-made { font-size: 0.84rem; color: var(--text-muted); }

/* ============================================================
   ANIMATIONS / SCROLL REVEAL
   ============================================================ */
@keyframes fadeInUp { from { opacity: 0; transform: translateY(28px); } to { opacity: 1; transform: translateY(0); } }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.4; } }
@keyframes float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-12px); } }
@keyframes spin { to { transform: rotate(360deg); } }

[data-aos] { opacity: 0; transform: translateY(28px); transition: opacity 0.7s ease, transform 0.7s cubic-bezier(0.2, 0.7, 0.2, 1); }
[data-aos="fade-up"].aos-animate { opacity: 1; transform: translateY(0); }
[data-aos="fade-right"] { transform: translateX(-28px); }
[data-aos="fade-right"].aos-animate { opacity: 1; transform: translateX(0); }
[data-aos="fade-left"] { transform: translateX(28px); }
[data-aos="fade-left"].aos-animate { opacity: 1; transform: translateX(0); }

.spin { animation: spin 1s linear infinite; }

::selection { background: var(--accent); color: #fff; }
::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--bg-3); border-radius: 5px; border: 2px solid var(--bg); }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

@media (prefers-reduced-motion: reduce) {
    * { animation: none !important; transition: none !important; }
    [data-aos] { opacity: 1 !important; transform: none !important; }
}

/* ============================================================
   RESPONSIVE — shared
   ============================================================ */
@media (max-width: 1024px) { :root { --section-pad: 88px; } }

@media (max-width: 860px) {
    .nav-menu {
        position: fixed;
        inset: 0 -100% 0 auto;
        width: 78%;
        max-width: 330px;
        height: 100vh;
        background: var(--bg-2);
        border-left: 1px solid var(--border);
        flex-direction: column;
        align-items: stretch;
        padding: 96px 28px 32px;
        gap: 4px;
        transition: right var(--t);
    }
    .nav-menu.open { right: 0; }
    .nav-link { padding: 14px 14px; font-size: 1.05rem; border-radius: var(--radius-sm); }
    .nav-cta { display: none; }
    .nav-toggle { display: flex; }
}

@media (max-width: 768px) {
    :root { --section-pad: 72px; }
    .form-row { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; gap: 36px; }
    .cta-band { padding: 44px 26px; }
    .container { padding: 0 22px; }
}