/* ========================================
   bd-777.org Design System - Emerald Trust Gaming UI
   ======================================== */

:root {
    --color-primary: #0d6efd;
    --color-primary-dark: #0a58ca;
    --color-primary-soft: #e7f1ff;
    --color-secondary: #198754;
    --color-secondary-dark: #146c43;
    --color-accent: #ffc107;
    --color-bg: #f0f6ff;
    --color-bg-soft: #e8f0fe;
    --color-surface: #ffffff;
    --color-surface-strong: #f8f9fa;
    --color-card: #ffffff;
    --color-card-alt: #f0f9ff;
    --color-border: #dee2e6;
    --color-border-strong: #0d6efd;
    --color-text: #1e293b;
    --color-text-soft: #475569;
    --color-text-muted: #94a3b8;
    --color-success: #198754;
    --color-warning: #ffc107;
    --color-danger: #dc3545;
    --color-footer-bg: #0f172a;
    --color-footer-text: #cbd5e1;

    --gradient-hero: linear-gradient(135deg, #0d6efd 0%, #0891b2 50%, #198754 100%);
    --gradient-button: linear-gradient(135deg, #198754, #0d6efd);
    --gradient-cta: linear-gradient(135deg, #198754 0%, #146c43 100%);
    --gradient-footer: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);

    --shadow-header: 0 2px 12px rgba(13,110,253,.15);
    --shadow-card: 0 4px 16px rgba(13,110,253,.08);
    --shadow-card-hover: 0 8px 28px rgba(13,110,253,.16);
    --shadow-button: 0 4px 12px rgba(25,135,84,.25);
    --shadow-soft: 0 2px 8px rgba(0,0,0,.06);

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-pill: 50px;
    --radius-card: 14px;

    --font-base: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, "Noto Sans Bengali", sans-serif;
    --fs-h1: clamp(1.8rem, 4vw, 3rem);
    --fs-h2: clamp(1.4rem, 3vw, 2.2rem);
    --fs-h3: clamp(1.1rem, 2vw, 1.5rem);
    --fs-body: 1.05rem;
    --fs-small: 0.9rem;
    --lh-body: 1.85;
    --lh-heading: 1.3;

    --container-max: 1200px;
    --container-narrow: 860px;
    --section-y: clamp(48px, 6vw, 80px);
    --gap-md: 24px;
    --gap-lg: 36px;
    --header-h: 72px;
    --mobile-header-h: 64px;

    --motion-normal: 0.3s;
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
    margin: 0;
    font-family: var(--font-base);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: var(--lh-body);
    font-size: var(--fs-body);
    overflow-x: hidden;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--color-primary); text-decoration: none; transition: color var(--motion-normal); }
a:hover { color: var(--color-primary-dark); }

.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 clamp(16px, 3vw, 24px);
}

/* ========================================
   HEADER
   ======================================== */
.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: var(--gradient-hero);
    box-shadow: var(--shadow-header);
    height: var(--header-h);
}

.header-inner {
    width: 100%;
    max-width: none;
    padding-left: clamp(10px, 1.2vw, 20px);
    padding-right: clamp(10px, 1.2vw, 20px);
    height: 100%;
    display: flex;
    align-items: center;
    gap: clamp(10px, 1vw, 18px);
}

.brand-wrap {
    flex: 0 0 auto;
    margin-right: clamp(4px, .8vw, 14px);
}

.site-logo {
    display: block;
    width: auto;
    height: clamp(32px, 3vw, 42px);
    max-width: clamp(118px, 10vw, 168px);
    object-fit: contain;
}

.primary-nav {
    flex: 1 1 auto;
    min-width: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: nowrap;
    gap: clamp(4px, .6vw, 12px);
    white-space: nowrap;
    overflow: visible;
}

.primary-nav a {
    flex: 0 1 auto;
    min-width: 0;
    padding: 8px clamp(5px, .55vw, 10px);
    font-size: clamp(12.5px, .8vw, 14.5px);
    line-height: 1;
    white-space: nowrap;
    color: rgba(255,255,255,.9);
    font-weight: 500;
    border-radius: var(--radius-sm);
    transition: all var(--motion-normal);
    text-decoration: none;
}

.primary-nav a:hover,
.primary-nav a.active {
    color: #fff;
    background: rgba(255,255,255,.15);
}

.header-actions {
    flex: 0 0 auto;
    margin-left: auto;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: clamp(6px, .6vw, 10px);
    white-space: nowrap;
}

.nav-toggle {
    display: none;
    width: 44px;
    height: 44px;
    border: none;
    background: rgba(255,255,255,.15);
    color: #fff;
    font-size: 1.5rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    align-items: center;
    justify-content: center;
    transition: background var(--motion-normal);
}

.nav-toggle:hover { background: rgba(255,255,255,.25); }

/* Mobile Menu */
.mobile-menu {
    display: none;
    position: fixed;
    top: var(--mobile-header-h);
    left: 0;
    right: 0;
    background: #0f172a;
    z-index: 999;
    max-height: calc(100vh - var(--mobile-header-h));
    overflow-y: auto;
    box-shadow: 0 8px 24px rgba(0,0,0,.3);
}

.mobile-menu.is-open { display: block; }

.mobile-nav {
    display: flex;
    flex-direction: column;
    padding: 12px 16px;
}

.mobile-nav a {
    color: #e2e8f0;
    padding: 14px 12px;
    font-size: 1rem;
    border-bottom: 1px solid rgba(255,255,255,.06);
    text-decoration: none;
    transition: background var(--motion-normal);
}

.mobile-nav a:hover { background: rgba(255,255,255,.05); color: #fff; }

/* ========================================
   HERO SECTIONS
   ======================================== */
.home-hero {
    background: var(--gradient-hero);
    color: #fff;
    padding: clamp(60px, 8vw, 100px) 0;
    text-align: center;
    position: relative;
}

.home-hero h1 {
    font-size: var(--fs-h1);
    font-weight: 700;
    line-height: var(--lh-heading);
    margin: 0 0 20px;
    text-shadow: 0 2px 8px rgba(0,0,0,.2);
}

.hero-lead {
    font-size: clamp(1rem, 2vw, 1.25rem);
    margin: 0 0 28px;
    opacity: .95;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.page-hero {
    background: var(--gradient-hero);
    color: #fff;
    padding: clamp(36px, 5vw, 56px) 0;
}

.page-hero h1 {
    font-size: clamp(1.5rem, 3.5vw, 2.4rem);
    font-weight: 700;
    line-height: var(--lh-heading);
    margin: 8px 0 12px;
}

.page-hero .hero-lead {
    font-size: 1.05rem;
    margin: 0;
    opacity: .9;
}

.page-hero nav[aria-label="breadcrumb"] {
    font-size: var(--fs-small);
    opacity: .8;
    margin-bottom: 4px;
}

.page-hero nav a { color: rgba(255,255,255,.8); }
.page-hero nav a:hover { color: #fff; }

/* ========================================
   BUTTONS
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    font-size: 1.05rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-pill);
    cursor: pointer;
    transition: all var(--motion-normal) var(--ease-out);
    text-decoration: none;
    white-space: nowrap;
    min-height: 48px;
}

.btn-primary {
    background: var(--color-secondary);
    color: #fff;
    box-shadow: var(--shadow-button);
}

.btn-primary:hover {
    background: var(--color-secondary-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(25,135,84,.35);
    color: #fff;
}

.btn-secondary {
    background: rgba(255,255,255,.15);
    color: #fff;
    border: 2px solid rgba(255,255,255,.4);
}

.btn-secondary:hover {
    background: rgba(255,255,255,.25);
    color: #fff;
}

.btn-full { width: 100%; }

/* ========================================
   TRUST STRIP
   ======================================== */
.home-trust-strip {
    background: var(--color-surface);
    padding: 20px 0;
    box-shadow: var(--shadow-soft);
}

.trust-items {
    display: flex;
    justify-content: center;
    gap: clamp(16px, 3vw, 40px);
    flex-wrap: wrap;
}

.trust-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    color: var(--color-primary);
    font-size: var(--fs-small);
}

.trust-item i { font-size: 1.3rem; }

/* ========================================
   CONTENT FLOW (data-seo-body)
   ======================================== */
.content-flow {
    padding: var(--section-y) 0;
}

.content-flow .container {
    max-width: var(--container-narrow);
}

.content-flow h2 {
    font-size: var(--fs-h2);
    font-weight: 700;
    color: var(--color-primary);
    margin: 36px 0 16px;
    line-height: var(--lh-heading);
}

.content-flow h2:first-child { margin-top: 0; }

.content-flow h3 {
    font-size: var(--fs-h3);
    font-weight: 600;
    color: var(--color-text);
    margin: 28px 0 12px;
}

.content-flow p {
    margin: 0 0 18px;
    text-align: justify;
    color: var(--color-text);
}

.content-flow img {
    border-radius: var(--radius-lg);
    margin: 28px auto;
    box-shadow: var(--shadow-card);
    max-width: 100%;
}

.prose { max-width: var(--container-narrow); }

/* ========================================
   GAME CARDS
   ======================================== */
.home-game-showcase {
    padding: var(--section-y) 0;
    background: var(--color-surface);
}

.section-heading {
    text-align: center;
    font-size: var(--fs-h2);
    font-weight: 700;
    color: var(--color-primary);
    margin: 0 0 32px;
    position: relative;
    padding-bottom: 12px;
}

.section-heading::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background: var(--gradient-button);
    border-radius: 2px;
}

.game-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: var(--gap-md);
}

.game-card {
    background: var(--color-card);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-card);
    padding: 24px;
    text-decoration: none;
    transition: all var(--motion-normal) var(--ease-out);
    display: block;
}

.game-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-card-hover);
    border-color: var(--color-primary);
}

.game-card h3 {
    color: var(--color-primary);
    font-size: 1.1rem;
    font-weight: 700;
    margin: 0 0 8px;
}

.game-card p {
    color: var(--color-text-soft);
    margin: 0;
    font-size: var(--fs-small);
}

/* ========================================
   CTA SECTIONS
   ======================================== */
.home-final-cta,
.page-cta {
    background: var(--gradient-cta);
    color: #fff;
    padding: clamp(40px, 5vw, 64px) 0;
    text-align: center;
    border-radius: var(--radius-xl);
    margin: 32px auto;
    max-width: var(--container-max);
}

.home-final-cta h2,
.page-cta h2 {
    font-size: var(--fs-h2);
    margin: 0 0 12px;
    color: #fff;
}

.home-final-cta p,
.page-cta p {
    margin: 0 0 24px;
    opacity: .9;
}

/* ========================================
   AUTH PAGES
   ======================================== */
.auth-layout { padding: var(--section-y) 0; }

.auth-grid {
    display: grid;
    grid-template-columns: 400px 1fr;
    gap: var(--gap-lg);
    align-items: start;
}

.auth-form-card,
.register-form-card {
    background: var(--color-surface);
    padding: 32px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
    position: sticky;
    top: calc(var(--header-h) + 20px);
}

.auth-form-card h2 {
    color: var(--color-primary);
    margin: 0 0 24px;
    font-size: 1.5rem;
}

.form-group {
    margin-bottom: 18px;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-weight: 600;
    font-size: var(--fs-small);
    color: var(--color-text);
}

.form-group input {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-family: var(--font-base);
    transition: border-color var(--motion-normal);
    background: var(--color-surface);
    color: var(--color-text);
}

.form-group input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(13,110,253,.15);
}

.auth-alt {
    text-align: center;
    margin-top: 16px;
    font-size: var(--fs-small);
    color: var(--color-text-soft);
}

.auth-info-card,
.register-info-panel {
    background: var(--color-card-alt);
    padding: 32px;
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--color-primary);
}

.auth-info-card h2,
.register-info-panel h2 {
    color: var(--color-primary);
    font-size: var(--fs-h2);
    margin: 28px 0 14px;
}

.auth-info-card h2:first-child,
.register-info-panel h2:first-child { margin-top: 0; }

.auth-info-card h3,
.register-info-panel h3 {
    font-size: var(--fs-h3);
    margin: 20px 0 10px;
}

.auth-info-card p,
.register-info-panel p {
    margin: 0 0 16px;
    color: var(--color-text);
}

.auth-info-card img,
.register-info-panel img {
    border-radius: var(--radius-md);
    margin: 20px 0;
}

/* ========================================
   FAQ
   ======================================== */
.faq-item {
    margin-bottom: 12px;
    background: var(--color-surface);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    overflow: hidden;
}

.faq-toggle {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 20px;
    background: none;
    border: none;
    cursor: pointer;
    text-align: left;
    font-family: var(--font-base);
    transition: background var(--motion-normal);
}

.faq-toggle:hover { background: var(--color-bg-soft); }

.faq-toggle h3 {
    margin: 0;
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--color-primary);
    flex: 1;
}

.faq-toggle i {
    font-size: 1.1rem;
    color: var(--color-primary);
    transition: transform var(--motion-normal);
    flex-shrink: 0;
    margin-left: 12px;
}

.faq-item.is-open .faq-toggle i { transform: rotate(180deg); }

.faq-answer {
    display: none;
    padding: 0 20px 18px;
}

.faq-item.is-open .faq-answer { display: block; }

.faq-answer p {
    margin: 0;
    color: var(--color-text);
    line-height: var(--lh-body);
}

/* ========================================
   FOOTER
   ======================================== */
.site-footer {
    background: var(--gradient-footer);
    color: var(--color-footer-text);
    padding: 48px 0 20px;
    margin-top: 48px;
}

.footer-inner {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 clamp(16px, 3vw, 24px);
}

.footer-brand {
    margin-bottom: 32px;
}

.footer-brand img {
    margin-bottom: 12px;
    opacity: .9;
}

.footer-brand p {
    max-width: 400px;
    font-size: var(--fs-small);
    line-height: 1.7;
    opacity: .8;
}

.footer-links-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--gap-lg);
    margin-bottom: 32px;
}

.footer-col h4 {
    color: #fff;
    font-size: 1rem;
    margin: 0 0 14px;
    font-weight: 600;
}

.footer-col a,
.footer-col p {
    display: block;
    color: var(--color-footer-text);
    font-size: var(--fs-small);
    padding: 5px 0;
    transition: color var(--motion-normal);
    text-decoration: none;
}

.footer-col a:hover { color: #fff; }

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,.08);
    padding-top: 20px;
    text-align: center;
    font-size: var(--fs-small);
    opacity: .7;
}

/* ========================================
   ERROR PAGE
   ======================================== */
.error-page {
    text-align: center;
    padding: 80px 0;
}

.error-page h1 {
    font-size: 3rem;
    color: var(--color-primary);
    margin: 0 0 16px;
}

.error-page p {
    margin: 0 0 28px;
    color: var(--color-text-soft);
}

/* ========================================
   RESPONSIVE
   ======================================== */
@media (max-width: 1180px) {
    .primary-nav { display: none; }
    .nav-toggle { display: inline-flex; }
    .site-header { height: var(--mobile-header-h); }

    .header-inner {
        padding-left: clamp(8px, 2.4vw, 14px);
        padding-right: clamp(8px, 2.4vw, 14px);
        gap: clamp(6px, 1.8vw, 10px);
    }

    .brand-wrap { flex: 0 1 auto; margin-right: 0; }
    .site-logo { height: clamp(30px, 8vw, 40px); max-width: clamp(104px, 27vw, 138px); }

    .header-actions {
        margin-left: auto;
        justify-content: flex-end;
    }
}

@media (max-width: 900px) {
    .auth-grid { grid-template-columns: 1fr; }
    .auth-form-card { position: static; }
    .footer-links-grid { grid-template-columns: repeat(2, 1fr); }
    .game-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
    .footer-links-grid { grid-template-columns: 1fr; }
    .game-grid { grid-template-columns: 1fr; }
    .trust-items { gap: 12px; }
    .trust-item { font-size: 0.82rem; }
}

@media (max-width: 375px) {
    .header-inner { padding-left: 8px; padding-right: 8px; gap: 6px; }
    .site-logo { max-width: 104px; }
    .nav-toggle { width: 38px; height: 38px; }
    .btn { padding: 12px 20px; font-size: 0.95rem; min-height: 44px; }
}

/* Focus visible */
:focus-visible {
    outline: 3px solid var(--color-primary);
    outline-offset: 2px;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
    html { scroll-behavior: auto; }
}