/* ═══════════════════════════════════════════
   NickKnows Design System
   ═══════════════════════════════════════════ */

/* ── Tokens ── */
:root {
    /* Colors */
    --bg: #0a0a0f;
    --surface: #12121a;
    --surface-hover: #1a1a25;
    --border: rgba(255, 255, 255, 0.06);
    --border-hover: rgba(255, 255, 255, 0.12);
    --text: #e8e6e3;
    --text-muted: #8a8a9a;
    --accent: #4f8fff;
    --accent-glow: rgba(79, 143, 255, 0.15);
    --accent-hover: #6da3ff;
    --danger: #D50A0A;

    /* Typography */
    --font: 'DM Sans', system-ui, -apple-system, sans-serif;
    --font-display: 'Instrument Serif', Georgia, serif;

    /* Spacing */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 40px;
    --space-2xl: 64px;
    --space-3xl: 100px;

    /* Radii */
    --radius: 16px;
    --radius-sm: 10px;
    --radius-pill: 100px;

    /* Transitions */
    --ease: cubic-bezier(0.16, 1, 0.3, 1);
    --duration: 0.3s;

    /* Layout */
    --content-width: 1200px;
    --content-padding: clamp(24px, 6vw, 120px);
}

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

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

body {
    background: var(--bg);
    color: var(--text);
    font-family: var(--font);
    font-size: 15px;
    line-height: 1.6;
    overflow-x: hidden;
}

a {
    color: inherit;
    text-decoration: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 3px; }

/* ═══════════════════════════════════════════
   Navigation
   ═══════════════════════════════════════════ */
.nk-nav {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 100;
    padding: 20px 32px;
    transition: all 0.4s var(--ease);
}

.nk-nav--shrunk {
    padding: 12px 32px;
    background: rgba(10, 10, 15, 0.92);
    backdrop-filter: blur(20px) saturate(1.4);
    border-bottom: 1px solid var(--border);
}

.nk-nav__inner {
    max-width: var(--content-width);
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-lg);
}

.nk-nav__brand {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    text-decoration: none;
}

.nk-nav__logo {
    height: 36px;
    width: auto;
    border-radius: 6px;
    transition: height var(--duration) var(--ease);
}

.nk-nav--shrunk .nk-nav__logo {
    height: 28px;
}

.nk-nav__wordmark {
    font-family: var(--font-display);
    font-size: 24px;
    letter-spacing: -0.02em;
}

.nk-nav__links {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
}

.nk-nav__link {
    color: var(--text-muted);
    font-size: 13px;
    font-weight: 500;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    transition: color 0.2s;
    background: none;
    border: none;
    cursor: pointer;
    font-family: inherit;
}

.nk-nav__link:hover {
    color: var(--text);
}

/* Dropdown */
.nk-nav__dropdown {
    position: relative;
}

.nk-nav__dropdown-btn {
    display: flex;
    align-items: center;
    gap: 4px;
}

.nk-nav__dropdown-content {
    display: none;
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    min-width: 180px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 12px 0 var(--space-sm);
    box-shadow: 0 16px 48px rgba(0,0,0,0.4);
}

.nk-nav__dropdown:hover .nk-nav__dropdown-content {
    display: block;
}

.nk-nav__dropdown-content a {
    display: block;
    padding: 10px 20px;
    font-size: 14px;
    color: var(--text-muted);
    transition: all 0.15s;
}

.nk-nav__dropdown-content a:hover {
    color: var(--text);
    background: var(--surface-hover);
}

/* Social */
.nk-nav__social {
    display: flex;
    gap: var(--space-md);
    align-items: center;
}

.nk-nav__social a {
    color: var(--text-muted);
    font-size: 16px;
    transition: color 0.2s;
}

.nk-nav__social a:hover {
    color: var(--text);
}

/* Hamburger */
.nk-nav__hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nk-nav__hamburger span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text);
    border-radius: 1px;
    transition: all 0.2s;
}

/* ═══════════════════════════════════════════
   Hero
   ═══════════════════════════════════════════ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 0 var(--content-padding);
    overflow: hidden;
}

.hero__ambient {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    pointer-events: none;
}

.hero__ambient--1 {
    top: -20%; right: -10%;
    width: 700px; height: 700px;
    background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
}

.hero__ambient--2 {
    bottom: -10%; left: -5%;
    width: 500px; height: 500px;
    background: radial-gradient(circle, rgba(143, 95, 255, 0.08) 0%, transparent 70%);
}

.hero__content {
    max-width: 900px;
    position: relative;
    z-index: 1;
}

.hero__badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 6px 14px;
    border-radius: var(--radius-pill);
    background: rgba(79, 143, 255, 0.08);
    border: 1px solid rgba(79, 143, 255, 0.15);
    margin-bottom: 28px;
    font-size: 12px;
    color: var(--accent);
    font-weight: 500;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.hero__badge-dot {
    width: 6px; height: 6px;
    border-radius: 50%;
    background: #4ade80;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

.hero__title {
    font-family: var(--font-display);
    font-size: clamp(48px, 7vw, 88px);
    font-weight: 400;
    line-height: 1.05;
    letter-spacing: -0.03em;
    margin-bottom: var(--space-lg);
}

.hero__title em {
    font-style: italic;
    background: linear-gradient(135deg, var(--accent), #8f5fff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero__subtitle {
    font-size: 18px;
    line-height: 1.7;
    color: var(--text-muted);
    max-width: 560px;
    margin-bottom: var(--space-xl);
}

.hero__actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.hero__scroll-hint {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
    opacity: 0.4;
    transition: opacity 0.4s;
}

.hero__scroll-hint span {
    font-size: 11px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-muted);
}

.hero__scroll-line {
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, var(--text-muted), transparent);
}

/* ═══════════════════════════════════════════
   Buttons
   ═══════════════════════════════════════════ */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 14px 28px;
    border-radius: var(--radius-pill);
    font-size: 14px;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    letter-spacing: 0.02em;
    transition: all 0.2s var(--ease);
    border: none;
    text-decoration: none;
}

.btn--primary {
    background: var(--accent);
    color: #fff;
    box-shadow: 0 4px 24px rgba(79, 143, 255, 0.3);
}

.btn--primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 32px rgba(79, 143, 255, 0.4);
}

.btn--ghost {
    background: rgba(255, 255, 255, 0.03);
    color: var(--text);
    border: 1px solid var(--border);
    font-weight: 500;
}

.btn--ghost:hover {
    background: rgba(255, 255, 255, 0.06);
    border-color: var(--border-hover);
}

/* ═══════════════════════════════════════════
   Stats Ribbon
   ═══════════════════════════════════════════ */
.stats-ribbon {
    display: flex;
    justify-content: center;
    gap: clamp(32px, 6vw, 80px);
    padding: var(--space-xl) var(--space-lg);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.stats-ribbon__value {
    display: block;
    font-family: var(--font-display);
    font-size: 32px;
    letter-spacing: -0.02em;
}

.stats-ribbon__label {
    display: block;
    font-size: 12px;
    color: var(--text-muted);
    letter-spacing: 0.06em;
    text-transform: uppercase;
    margin-top: var(--space-xs);
}

.stats-ribbon__item {
    text-align: center;
}

/* ═══════════════════════════════════════════
   Sections
   ═══════════════════════════════════════════ */
.section {
    padding: var(--space-3xl) var(--content-padding);
}

.section__header {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    margin-bottom: 48px;
    flex-wrap: wrap;
    gap: var(--space-md);
}

.section__eyebrow {
    display: block;
    font-size: 12px;
    color: var(--accent);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    font-weight: 600;
}

.section__title {
    font-family: var(--font-display);
    font-size: clamp(32px, 4vw, 48px);
    margin-top: var(--space-sm);
    letter-spacing: -0.02em;
    font-weight: 400;
}

.section__link {
    color: var(--accent);
    font-size: 14px;
    font-weight: 500;
    transition: gap 0.2s;
}

.section__link:hover {
    text-decoration: underline;
}

/* ═══════════════════════════════════════════
   Feature Cards (NFL grid)
   ═══════════════════════════════════════════ */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-md);
}

.feature-card {
    padding: 28px;
    border-radius: var(--radius);
    background: var(--surface);
    border: 1px solid var(--border);
    transition: all var(--duration) var(--ease);
    cursor: pointer;
}

.feature-card:hover {
    background: var(--surface-hover);
    border-color: var(--border-hover);
    transform: translateY(-4px);
}

.feature-card__icon {
    font-size: 28px;
    margin-bottom: var(--space-md);
}

.feature-card__title {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: var(--space-sm);
}

.feature-card__desc {
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.5;
}

/* ═══════════════════════════════════════════
   Interest Cards (image + text)
   ═══════════════════════════════════════════ */
.interest-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 24px;
}

.interest-card {
    position: relative;
    border-radius: var(--radius);
    background: var(--surface);
    border: 1px solid var(--border);
    overflow: hidden;
    text-decoration: none;
    color: inherit;
    transition: all 0.4s var(--ease);
}

.interest-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 20px 60px rgba(0,0,0,0.3), 0 0 0 1px rgba(255,255,255,0.08);
}

.interest-card__image {
    position: relative;
    width: 100%;
    height: 220px;
    overflow: hidden;
}

.interest-card__image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s var(--ease);
}

.interest-card:hover .interest-card__image img {
    transform: scale(1.05);
}

.interest-card__body {
    padding: 24px;
}

.interest-card__title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
}

.interest-card__desc {
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.6;
}

.tag {
    padding: 4px 10px;
    border-radius: var(--radius-pill);
    background: rgba(255,255,255,0.04);
    border: 1px solid var(--border);
    font-size: 11px;
    color: var(--text-muted);
    letter-spacing: 0.02em;
}

/* ═══════════════════════════════════════════
   Flash Messages
   ═══════════════════════════════════════════ */
.flash-container {
    position: fixed;
    top: 80px;
    right: 24px;
    z-index: 200;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    max-width: 400px;
}

.flash-message {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-md);
    padding: 14px 20px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 14px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.3);
    animation: slideIn 0.3s var(--ease);
}

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

.flash-close {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 18px;
    cursor: pointer;
    padding: 0 4px;
}

/* ═══════════════════════════════════════════
   Tables (for NFL data pages)
   ═══════════════════════════════════════════ */
.table-wrapper {
    overflow-x: auto;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    margin: var(--space-lg) 0;
}

.table-wrapper table,
table.table,
table.dataframe {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}

.table-wrapper th,
table.table th,
table.dataframe th {
    background: var(--surface);
    color: var(--text-muted);
    font-weight: 600;
    font-size: 11px;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
}

.table-wrapper td,
table.table td,
table.dataframe td {
    padding: 10px 16px;
    border-bottom: 1px solid var(--border);
    color: var(--text);
}

.table-wrapper tr:hover td,
table.table tr:hover td,
table.dataframe tr:hover td {
    background: var(--surface-hover);
}

/* ═══════════════════════════════════════════
   Content Pages (generic)
   ═══════════════════════════════════════════ */
.page-header {
    padding: 140px var(--content-padding) var(--space-xl);
}

.page-header__title {
    font-family: var(--font-display);
    font-size: clamp(36px, 5vw, 56px);
    letter-spacing: -0.02em;
    font-weight: 400;
}

.page-header__subtitle {
    font-size: 16px;
    color: var(--text-muted);
    margin-top: var(--space-sm);
    max-width: 600px;
}

.content-section {
    padding: 0 var(--content-padding) var(--space-3xl);
    max-width: calc(var(--content-width) + var(--content-padding) * 2);
}

.content-section p {
    font-size: 16px;
    line-height: 1.8;
    color: var(--text-muted);
    max-width: 720px;
}

/* Video embeds */
.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--space-lg);
    margin-top: var(--space-xl);
}

.video-grid iframe {
    width: 100%;
    aspect-ratio: 16 / 9;
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

/* ═══════════════════════════════════════════
   NFL Sub-nav
   ═══════════════════════════════════════════ */
.nfl-subnav {
    padding: 100px var(--content-padding) 0;
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
    border-bottom: 1px solid var(--border);
    padding-bottom: var(--space-md);
    margin-bottom: var(--space-xl);
}

.nfl-subnav a {
    padding: 8px 16px;
    border-radius: var(--radius-pill);
    font-size: 13px;
    font-weight: 500;
    color: var(--text-muted);
    transition: all 0.2s;
}

.nfl-subnav a:hover,
.nfl-subnav a.active {
    color: var(--text);
    background: var(--surface);
}

.nfl-content {
    padding: 0 var(--content-padding);
}

/* ═══════════════════════════════════════════
   Footer
   ═══════════════════════════════════════════ */
.nk-footer {
    padding: var(--space-xl) var(--content-padding);
    border-top: 1px solid var(--border);
}

.nk-footer__inner {
    max-width: var(--content-width);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-md);
}

.nk-footer__wordmark {
    font-family: var(--font-display);
    font-size: 20px;
}

.nk-footer__credit {
    font-size: 12px;
    color: var(--text-muted);
    margin-left: 12px;
}

.nk-footer__credit a {
    color: var(--accent);
    text-decoration: none;
}

.nk-footer__links {
    display: flex;
    gap: var(--space-lg);
}

.nk-footer__links a {
    color: var(--text-muted);
    font-size: 13px;
    transition: color 0.2s;
}

.nk-footer__links a:hover {
    color: var(--text);
}

/* ═══════════════════════════════════════════
   Animations
   ═══════════════════════════════════════════ */
.fade-in {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Stagger children */
.feature-grid .fade-in:nth-child(1) { transition-delay: 0.0s; }
.feature-grid .fade-in:nth-child(2) { transition-delay: 0.05s; }
.feature-grid .fade-in:nth-child(3) { transition-delay: 0.1s; }
.feature-grid .fade-in:nth-child(4) { transition-delay: 0.15s; }
.feature-grid .fade-in:nth-child(5) { transition-delay: 0.2s; }
.feature-grid .fade-in:nth-child(6) { transition-delay: 0.25s; }

.interest-grid .fade-in:nth-child(1) { transition-delay: 0.0s; }
.interest-grid .fade-in:nth-child(2) { transition-delay: 0.06s; }
.interest-grid .fade-in:nth-child(3) { transition-delay: 0.12s; }
.interest-grid .fade-in:nth-child(4) { transition-delay: 0.18s; }
.interest-grid .fade-in:nth-child(5) { transition-delay: 0.24s; }
.interest-grid .fade-in:nth-child(6) { transition-delay: 0.3s; }
.interest-grid .fade-in:nth-child(7) { transition-delay: 0.36s; }
.interest-grid .fade-in:nth-child(8) { transition-delay: 0.42s; }

/* ═══════════════════════════════════════════
   Responsive
   ═══════════════════════════════════════════ */
@media (max-width: 768px) {
    .nk-nav__links {
        display: none;
        position: fixed;
        top: 0; left: 0; right: 0; bottom: 0;
        background: var(--bg);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: var(--space-xl);
        z-index: 99;
    }

    .nk-nav__links.active {
        display: flex;
    }

    .nk-nav__links .nk-nav__link {
        font-size: 18px;
    }

    .nk-nav__social {
        display: none;
    }

    .nk-nav__hamburger {
        display: flex;
    }

    .stats-ribbon {
        flex-wrap: wrap;
        gap: var(--space-xl);
    }

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

    .hero__title {
        font-size: clamp(36px, 8vw, 52px);
    }

    .hero__scroll-hint {
        display: none;
    }

    .nk-nav__dropdown-content {
        position: static;
        transform: none;
        background: transparent;
        border: none;
        box-shadow: none;
        padding: 0;
        display: none;
    }

    .nk-nav__dropdown:hover .nk-nav__dropdown-content,
    .nk-nav__links.active .nk-nav__dropdown-content {
        display: block;
    }
}

@media (max-width: 480px) {
    .feature-grid {
        grid-template-columns: 1fr;
    }

    .hero__actions {
        flex-direction: column;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }
}