/* ═══════════════════════════════════════════════════════════════════
   Fuusio — the Kide visual system, shifted from ember to steel.
   Identity: polar night cooled to cobalt, after the Fuusio logo.
   ═══════════════════════════════════════════════════════════════════ */

:root {
    --night-0: #05080d;
    --night-1: #070d16;
    --night-2: #0a121d;

    --steel-1: #9fc6ff;      /* primary */
    --steel-2: #3b82f6;
    --cyan: #67e8f9;
    --violet: #8b9dff;      /* used sparingly */

    --text-1: #ecf2fa;
    --text-2: #94a6bd;
    --text-3: #5f6e80;

    --line: rgba(159, 198, 255, 0.12);
    --line-strong: rgba(159, 198, 255, 0.28);
    --panel: rgba(10, 18, 29, 0.72);

    --font-main: 'Inter', system-ui, sans-serif;
    --font-code: 'JetBrains Mono', monospace;

    --r: 14px;
}

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

html { scroll-behavior: smooth; scroll-padding-top: 6rem; }

body {
    background: var(--night-0);
    color: var(--text-1);
    font-family: var(--font-main);
    line-height: 1.65;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

::selection { background: rgba(159, 198, 255, 0.25); }

/* ── Atmosphere ─────────────────────────────────────────────────── */

.aurora {
    position: fixed;
    inset: -20% -10% auto -10%;
    height: 75vh;
    z-index: -2;
    pointer-events: none;
    background:
        radial-gradient(45% 60% at 18% 22%, rgba(103, 232, 249, 0.12), transparent 70%),
        radial-gradient(50% 65% at 62% 12%, rgba(59, 130, 246, 0.18), transparent 70%),
        radial-gradient(40% 55% at 88% 30%, rgba(139, 157, 255, 0.13), transparent 70%);
    filter: blur(40px);
    animation: aurora-drift 24s ease-in-out infinite alternate;
}

@keyframes aurora-drift {
    from { transform: translateX(-3%) skewY(-1.5deg); opacity: 0.9; }
    to   { transform: translateX(3%)  skewY(1.5deg);  opacity: 1; }
}

.grid-lines {
    position: fixed;
    inset: 0;
    z-index: -1;
    pointer-events: none;
    background-image:
        linear-gradient(var(--line) 1px, transparent 1px),
        linear-gradient(90deg, var(--line) 1px, transparent 1px);
    background-size: 72px 72px;
    mask-image: radial-gradient(ellipse 90% 55% at 50% 0%, black 25%, transparent 78%);
    -webkit-mask-image: radial-gradient(ellipse 90% 55% at 50% 0%, black 25%, transparent 78%);
    opacity: 0.5;
}

/* ── Type ───────────────────────────────────────────────────────── */

h1 {
    font-size: clamp(2.8rem, 6vw, 4.6rem);
    font-weight: 900;
    line-height: 1.04;
    letter-spacing: -0.03em;
    margin-bottom: 1.4rem;
}

h2 {
    font-size: clamp(1.8rem, 3.4vw, 2.6rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    line-height: 1.15;
    margin-bottom: 1rem;
}

h3 { font-size: 1.13rem; font-weight: 700; margin-bottom: 0.6rem; letter-spacing: -0.01em; }

p { color: var(--text-2); }
p strong { color: var(--text-1); font-weight: 600; }
p em { color: var(--steel-1); font-style: italic; }

p code, .card code {
    font-family: var(--font-code);
    font-size: 0.86em;
    color: var(--steel-1);
    background: rgba(159, 198, 255, 0.08);
    border: 1px solid var(--line);
    border-radius: 5px;
    padding: 0.08em 0.4em;
    white-space: nowrap;
}

.gradient-text {
    background: linear-gradient(100deg, var(--steel-1) 10%, var(--cyan) 55%, var(--steel-2) 95%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.kicker {
    display: block;
    font-family: var(--font-code);
    font-size: 0.8rem;
    font-weight: 500;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--cyan);
    margin-bottom: 0.9rem;
}

/* ── Nav ────────────────────────────────────────────────────────── */

.navbar {
    position: fixed;
    top: 0; width: 100%;
    z-index: 100;
    background: rgba(5, 8, 13, 0.65);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid transparent;
    transition: border-color 0.3s ease, background 0.3s ease;
}
.navbar.scrolled { border-bottom-color: var(--line); background: rgba(5, 8, 13, 0.85); }

.nav-content {
    max-width: 1180px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: inline-flex;
    align-items: center;
    gap: 0.55rem;
    font-size: 1.3rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--text-1);
    text-decoration: none;
}
.logo-mark {
    width: 28px;
    height: 28px;
    display: block;
    filter: drop-shadow(0 0 10px rgba(59, 130, 246, 0.45));
}

.nav-links { display: flex; gap: 1.8rem; align-items: center; }
.nav-links a {
    color: var(--text-2);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.92rem;
    transition: color 0.25s ease;
}
.nav-links a:hover { color: var(--steel-1); }

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

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.8rem 1.6rem;
    border-radius: 10px;
    font-weight: 600;
    font-size: 0.95rem;
    font-family: var(--font-main);
    text-decoration: none;
    cursor: pointer;
    border: none;
    transition: transform 0.2s ease, box-shadow 0.25s ease, background 0.25s ease, border-color 0.25s ease, color 0.25s ease;
}

.btn-primary {
    background: linear-gradient(120deg, var(--steel-2), var(--cyan));
    color: #04121f;
    box-shadow: 0 4px 24px rgba(59, 130, 246, 0.3);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 32px rgba(103, 232, 249, 0.35); }

/* The Play Store link isn't live yet — present, but plainly inert. */
.btn.is-disabled {
    background: rgba(159, 198, 255, 0.10);
    border: 1px dashed var(--line-strong);
    color: var(--text-2);
    box-shadow: none;
    cursor: default;
}
.btn.is-disabled:hover { transform: none; box-shadow: none; }

.btn-secondary {
    background: rgba(159, 198, 255, 0.07);
    border: 1px solid var(--line-strong);
    color: var(--text-1);
}
.btn-secondary:hover { background: rgba(159, 198, 255, 0.14); }

.btn-outline {
    background: transparent;
    border: 1px solid var(--line);
    color: var(--text-1) !important;
    font-size: 0.88rem;
    padding: 0.55rem 1.1rem;
}
.btn-outline:hover { border-color: var(--steel-1); color: var(--steel-1) !important; }

/* ── Layout ─────────────────────────────────────────────────────── */

main { max-width: 1180px; margin: 0 auto; padding: 8.5rem 2rem 3rem; }
section { margin-bottom: 9rem; }
.section-header { max-width: 640px; margin: 0 auto 3.5rem; text-align: center; }

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

.hero {
    display: grid;
    grid-template-columns: 1.05fr 0.95fr;
    gap: 4rem;
    align-items: center;
    padding: 3rem 0 4rem;
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.55rem;
    padding: 0.45rem 1rem;
    background: rgba(103, 232, 249, 0.08);
    border: 1px solid rgba(103, 232, 249, 0.25);
    color: var(--cyan);
    border-radius: 999px;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.03em;
    margin-bottom: 1.6rem;
}
.badge-pulse {
    width: 7px; height: 7px; border-radius: 50%;
    background: var(--cyan);
    animation: pulse 2.4s ease-in-out infinite;
}
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.35; } }

.subtitle { font-size: 1.13rem; margin-bottom: 2.2rem; }
.cta-group { display: flex; gap: 1rem; flex-wrap: wrap; }
.hero-footnote {
    margin-top: 1.6rem;
    font-family: var(--font-code);
    font-size: 0.78rem;
    color: var(--text-3);
    letter-spacing: 0.02em;
}

/* ── Hero logo stage ────────────────────────────────────────────── */

.logo-stage {
    position: relative;
    display: grid;
    place-items: center;
    padding: 3rem 1rem;
}
.logo-stage::before {
    content: "";
    position: absolute;
    width: 78%;
    aspect-ratio: 1;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(59, 130, 246, 0.30), transparent 68%);
    filter: blur(30px);
    animation: halo 6s ease-in-out infinite alternate;
}
@keyframes halo {
    from { transform: scale(0.94); opacity: 0.75; }
    to   { transform: scale(1.06); opacity: 1; }
}

.logo-hero {
    position: relative;
    width: min(278px, 68%);
    height: auto;
    filter: drop-shadow(0 18px 42px rgba(59, 130, 246, 0.42));
    animation: float 7s ease-in-out infinite alternate;
}
@keyframes float {
    from { transform: translateY(-8px) rotate(-1.5deg); }
    to   { transform: translateY(8px)  rotate(1.5deg); }
}

/* ── Cards ──────────────────────────────────────────────────────── */

.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(255px, 1fr)); gap: 1.3rem; }

.card {
    position: relative;
    padding: 1.9rem;
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: var(--r);
    transition: transform 0.35s ease, border-color 0.35s ease;
    overflow: hidden;
}
.card::before {
    content: "";
    position: absolute;
    inset: 0 0 auto 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--line-strong), transparent);
}
.card:hover { transform: translateY(-4px); border-color: var(--line-strong); }
.card p { font-size: 0.94rem; }

.card-num {
    font-family: var(--font-code);
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--cyan);
    letter-spacing: 0.15em;
    margin-bottom: 1rem;
}

/* ── Banner ─────────────────────────────────────────────────────── */

.banner {
    position: relative;
    text-align: center;
    padding: 4.5rem 2rem;
    border: 1px solid var(--line);
    border-radius: 20px;
    background:
        radial-gradient(60% 120% at 50% 0%, rgba(59, 130, 246, 0.12), transparent 70%),
        radial-gradient(50% 100% at 80% 100%, rgba(103, 232, 249, 0.07), transparent 70%),
        var(--panel);
    overflow: hidden;
}
.banner p { max-width: 44em; margin: 0 auto 2rem; }

.banner-links { display: flex; gap: 2rem; justify-content: center; flex-wrap: wrap; }
.banner-links a {
    color: var(--text-2);
    font-size: 0.9rem;
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: color 0.2s ease, border-color 0.2s ease;
}
.banner-links a:hover { color: var(--steel-1); border-bottom-color: var(--steel-1); }

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

footer {
    text-align: center;
    padding: 2.5rem 2rem;
    border-top: 1px solid var(--line);
    color: var(--text-3);
    font-size: 0.85rem;
}
footer a { color: var(--text-2); text-decoration: none; border-bottom: 1px solid transparent; transition: color 0.2s ease, border-color 0.2s ease; }
footer a:hover { color: var(--steel-1); border-bottom-color: var(--steel-1); }

/* ── Reveal on scroll ───────────────────────────────────────────── */

.js .reveal { opacity: 0; transform: translateY(26px); transition: opacity 0.7s ease-out, transform 0.7s ease-out; }
.js .reveal.show { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { animation: none !important; transition: none !important; }
    .reveal { opacity: 1; transform: none; }
    html { scroll-behavior: auto; }
}

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

@media (max-width: 980px) {
    .hero { grid-template-columns: 1fr; gap: 2rem; padding-top: 1rem; }
    .logo-stage { padding: 1rem; }
}

@media (max-width: 700px) {
    .nav-links a:not(.btn) { font-size: 0.85rem; }
    .nav-links { gap: 1rem; }
    main { padding-top: 7rem; }
    section { margin-bottom: 6rem; }
}