/* Experimental Notkun.net shell — mesh, noise, reader chrome */

:root {
    --nk-cyan: #22d3ee;
    --nk-blue: #3b82f6;
    --nk-green-accent: #4ade80;
    --nk-emerald: #34d399;
    --nk-bg-deep: #030712;
    --nk-glass: rgba(15, 23, 42, 0.65);
}

/* Animated mesh background */
.site-shell {
    background-color: var(--nk-bg-deep);
    background-image:
        radial-gradient(ellipse 120% 80% at 0% -20%, rgba(34, 211, 238, 0.18), transparent 50%),
        radial-gradient(ellipse 80% 60% at 100% 0%, rgba(16, 185, 129, 0.15), transparent 45%),
        radial-gradient(ellipse 60% 50% at 50% 100%, rgba(59, 130, 246, 0.12), transparent 50%),
        linear-gradient(180deg, #030712 0%, #0f172a 50%, #030712 100%);
    background-attachment: fixed;
}

.site-shell.reader-open {
    overflow: hidden;
}

.noise-overlay {
    pointer-events: none;
    position: fixed;
    inset: 0;
    z-index: 1;
    opacity: 0.035;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

.site-content {
    position: relative;
    z-index: 2;
}

/* Floating nav */
.nav-glass {
    background: linear-gradient(135deg, rgba(15, 23, 42, 0.85), rgba(30, 41, 59, 0.75));
    border: 1px solid rgba(34, 211, 238, 0.22);
    box-shadow:
        0 4px 30px rgba(0, 0, 0, 0.35),
        inset 0 1px 0 rgba(255, 255, 255, 0.06);
}

.nav-link-ink {
    position: relative;
    padding: 0.35rem 0.75rem;
    border-radius: 9999px;
    transition: color 0.2s, background 0.2s;
}

.nav-link-ink:hover {
    color: var(--nk-cyan);
    background: rgba(34, 211, 238, 0.08);
}

/* Hero */
.hero-grid-bg {
    background-image:
        linear-gradient(rgba(34, 211, 238, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(34, 211, 238, 0.03) 1px, transparent 1px);
    background-size: 48px 48px;
    mask-image: radial-gradient(ellipse 70% 70% at 50% 40%, black 20%, transparent 70%);
}

.hero-title {
    font-family: Syne, system-ui, sans-serif;
    letter-spacing: -0.03em;
    line-height: 0.95;
}

.hero-badge {
    animation: heroBadgeFloat 5s ease-in-out infinite;
}

@keyframes heroBadgeFloat {
    0%,
    100% {
        transform: translateY(0) rotate(-2deg);
    }
    50% {
        transform: translateY(-6px) rotate(2deg);
    }
}

.signal-line {
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--nk-cyan), var(--nk-green-accent), transparent);
    background-size: 200% 100%;
    animation: signalShimmer 4s linear infinite;
}

@keyframes signalShimmer {
    0% {
        background-position: 200% 0;
    }
    100% {
        background-position: -200% 0;
    }
}

/* Topics zone */
.topics-zone {
    position: relative;
    border-top: 1px solid rgba(34, 211, 238, 0.15);
    background: linear-gradient(180deg, rgba(15, 23, 42, 0.5) 0%, rgba(3, 7, 18, 0.95) 100%);
}

.topics-toolbar-glass {
    background: rgba(15, 23, 42, 0.75);
    border: 1px solid rgba(148, 163, 184, 0.12);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.25);
}

/* Bento cards */
.topic-card-bento {
    position: relative;
    border-radius: 1.25rem;
    overflow: hidden;
    transition:
        transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1),
        box-shadow 0.35s ease;
}

.topic-card-bento::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    padding: 1px;
    background: linear-gradient(135deg, rgba(34, 211, 238, 0.35), transparent 40%, rgba(52, 211, 153, 0.25));
    -webkit-mask:
        linear-gradient(#fff 0 0) content-box,
        linear-gradient(#fff 0 0);
    mask:
        linear-gradient(#fff 0 0) content-box,
        linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    pointer-events: none;
}

.topic-card-bento:hover {
    transform: translateY(-6px) scale(1.01);
    box-shadow:
        0 20px 50px -12px rgba(34, 211, 238, 0.15),
        0 0 0 1px rgba(34, 211, 238, 0.12);
}

.topic-card-bento--hub::before {
    background: linear-gradient(135deg, rgba(192, 132, 252, 0.6), transparent 50%, rgba(236, 72, 153, 0.3));
}

.topic-card-bento--hub:hover {
    box-shadow:
        0 24px 60px -12px rgba(167, 139, 250, 0.25),
        0 0 0 1px rgba(192, 132, 252, 0.2);
}

.topic-card-inner {
    background: linear-gradient(165deg, rgba(30, 41, 59, 0.92) 0%, rgba(15, 23, 42, 0.95) 100%);
}

.topic-card-bento--hub .topic-card-inner {
    background: linear-gradient(165deg, rgba(6, 78, 59, 0.38) 0%, rgba(15, 23, 42, 0.95) 100%);
}

.topic-icon-blob {
    background: linear-gradient(135deg, var(--nk-cyan), var(--nk-blue));
    box-shadow: 0 8px 24px rgba(34, 211, 238, 0.25);
}

.topic-card-bento--hub .topic-icon-blob {
    background: linear-gradient(135deg, #34d399, #10b981);
    box-shadow: 0 8px 24px rgba(16, 185, 129, 0.35);
}

/* Category chips (toolbar) */
.topic-chip {
    border-radius: 9999px;
    border: 1px solid rgba(148, 163, 184, 0.2);
    background: rgba(30, 41, 59, 0.5);
    color: #cbd5e1;
    transition: all 0.2s ease;
}

.topic-chip:hover {
    border-color: rgba(34, 211, 238, 0.4);
    color: #e2e8f0;
}

.topic-chip-active {
    border-color: rgba(34, 211, 238, 0.55) !important;
    background: linear-gradient(135deg, rgba(34, 211, 238, 0.15), rgba(59, 130, 246, 0.1)) !important;
    color: #f1f5f9 !important;
    box-shadow: 0 0 20px rgba(34, 211, 238, 0.12);
}

/* Reader (modal) */
.reader-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(3, 7, 18, 0.75);
    backdrop-filter: blur(12px);
}

.reader-panel {
    position: relative;
    width: 100%;
    max-width: min(56rem, 100vw);
    height: 100%;
    max-height: 100%;
    display: flex;
    flex-direction: column;
    margin-left: auto;
    background: linear-gradient(180deg, #0f172a 0%, #020617 100%);
    border-left: 1px solid rgba(34, 211, 238, 0.12);
    box-shadow: -24px 0 80px rgba(0, 0, 0, 0.45);
    animation: readerSlideIn 0.45s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

@media (min-width: 768px) {
    .reader-panel {
        margin: 0;
        max-height: min(92vh, 100% - 2rem);
        border-radius: 1.5rem;
        border: 1px solid rgba(34, 211, 238, 0.15);
        box-shadow: 0 25px 80px rgba(0, 0, 0, 0.5);
    }
}

@keyframes readerSlideIn {
    from {
        transform: translateX(100%);
        opacity: 0.85;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@media (min-width: 768px) {
    @keyframes readerSlideIn {
        from {
            transform: translateX(24px) scale(0.97);
            opacity: 0;
        }
        to {
            transform: translateX(0) scale(1);
            opacity: 1;
        }
    }
}

#reader-progress {
    transform-origin: left;
    transform: scaleX(0);
    transition: transform 0.08s linear;
}

.reader-body {
    scrollbar-width: thin;
    scrollbar-color: rgba(34, 211, 238, 0.35) transparent;
}

.reader-body::-webkit-scrollbar {
    width: 8px;
}

.reader-body::-webkit-scrollbar-thumb {
    background: rgba(34, 211, 238, 0.25);
    border-radius: 9999px;
}

/* Content blocks inside reader — punchier than default */
.reader-body .content-section {
    border-radius: 1rem;
    border: 1px solid rgba(51, 65, 85, 0.5);
    background: rgba(15, 23, 42, 0.65);
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.2);
}

/* Contact / about bands */
.section-band {
    position: relative;
    overflow: hidden;
}

.section-band::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(34, 211, 238, 0.35), transparent);
}

.contact-card {
    background: linear-gradient(165deg, rgba(30, 41, 59, 0.7), rgba(15, 23, 42, 0.9));
    border: 1px solid rgba(34, 211, 238, 0.15);
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.25);
}

/* Tooltip visible state */
#tooltip.show {
    opacity: 1;
}

/* Preloader refresh */
#preloader {
    background: var(--nk-bg-deep);
}