/* ============================================================
   DESIGN SYSTEM: Emerald Trust Gaming UI
   bd-ok.me - Custom Design System
   ============================================================ */

:root {
  --color-primary: #0d6b3f;
  --color-primary-dark: #094d2d;
  --color-primary-soft: #e8f5ee;
  --color-secondary: #1a1a2e;
  --color-accent: #f0a500;
  --color-bg: #f7f9fc;
  --color-bg-soft: #eef2f7;
  --color-surface: #ffffff;
  --color-surface-strong: #f0f4f8;
  --color-card: #ffffff;
  --color-card-alt: #f8fafd;
  --color-border: #e2e8f0;
  --color-border-strong: #cbd5e1;
  --color-text: #1e293b;
  --color-text-soft: #475569;
  --color-text-muted: #94a3b8;
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-danger: #ef4444;
  --color-footer-bg: #0f172a;
  --color-footer-text: #cbd5e1;

  --gradient-hero: linear-gradient(135deg, #0d6b3f 0%, #1a1a2e 100%);
  --gradient-hero-soft: linear-gradient(180deg, rgba(13,107,63,.08) 0%, transparent 100%);
  --gradient-button: linear-gradient(135deg, #0d6b3f, #10b981);
  --gradient-button-hover: linear-gradient(135deg, #094d2d, #0d6b3f);
  --gradient-cta: linear-gradient(135deg, #1a1a2e 0%, #0d6b3f 100%);

  --shadow-header: 0 2px 20px rgba(0,0,0,.08);
  --shadow-card: 0 2px 12px rgba(0,0,0,.06);
  --shadow-card-hover: 0 8px 30px rgba(0,0,0,.12);
  --shadow-button: 0 4px 14px rgba(13,107,63,.25);
  --shadow-soft: 0 1px 3px rgba(0,0,0,.04);

  --radius-xs: 4px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --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(28px, 4vw, 48px);
  --fs-h2: clamp(22px, 3vw, 36px);
  --fs-h3: clamp(18px, 2.2vw, 24px);
  --fs-body: 17px;
  --fs-small: 14px;
  --fs-nav: clamp(13px, .84vw, 15px);
  --lh-heading: 1.3;
  --lh-body: 1.85;

  --container-max: 1200px;
  --container-wide: 1400px;
  --section-y: clamp(48px, 6vw, 80px);
  --section-y-sm: clamp(32px, 4vw, 56px);
  --gap-sm: 12px;
  --gap-md: 20px;
  --gap-lg: 32px;
  --header-h: 72px;
  --mobile-header-h: 64px;

  --motion-fast: .15s;
  --motion-normal: .3s;
  --ease-out: cubic-bezier(.16,1,.3,1);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: var(--font-base); font-size: var(--fs-body); line-height: var(--lh-body); color: var(--color-text); background: var(--color-bg); overflow-x: hidden; -webkit-font-smoothing: antialiased; }
img { max-width: 100%; height: auto; display: block; border-radius: var(--radius-sm); }
a { color: var(--color-primary); text-decoration: none; transition: color var(--motion-fast); }
a:hover { color: var(--color-primary-dark); }
ul, ol { list-style: none; }
:focus-visible { outline: 3px solid var(--color-accent); outline-offset: 2px; border-radius: var(--radius-xs); }

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

.container { width: 100%; max-width: var(--container-max); margin: 0 auto; padding-left: 20px; padding-right: 20px; }

/* ============================================================ HEADER ============================================================ */
.site-header { position: sticky; top: 0; z-index: 1000; background: rgba(255,255,255,.97); backdrop-filter: blur(12px); border-bottom: 1px solid var(--color-border); box-shadow: var(--shadow-header); }
.header-inner { width: 100%; max-width: none; padding-left: clamp(10px, 1.2vw, 20px); padding-right: clamp(10px, 1.2vw, 20px); min-height: var(--header-h); 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; border-radius: 0; }
.primary-nav { flex: 1 1 auto; min-width: 0; display: flex; align-items: center; justify-content: center; flex-wrap: nowrap; gap: clamp(6px, .72vw, 14px); white-space: nowrap; overflow: visible; }
.primary-nav a { flex: 0 1 auto; min-width: 0; padding: 9px clamp(6px, .65vw, 12px); font-size: var(--fs-nav); line-height: 1; white-space: nowrap; color: var(--color-text); font-weight: 500; border-radius: var(--radius-sm); transition: background var(--motion-fast), color var(--motion-fast); }
.primary-nav a:hover, .primary-nav a.active { background: var(--color-primary-soft); color: var(--color-primary); }
.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; }

.btn { display: inline-flex; align-items: center; justify-content: center; padding: 10px 20px; border-radius: var(--radius-pill); font-weight: 600; font-size: 14px; white-space: nowrap; transition: all var(--motion-fast); border: none; cursor: pointer; text-decoration: none; min-height: 42px; }
.btn-primary { background: var(--gradient-button); color: #fff; box-shadow: var(--shadow-button); }
.btn-primary:hover { background: var(--gradient-button-hover); color: #fff; transform: translateY(-1px); }
.btn-outline { background: transparent; color: var(--color-primary); border: 2px solid var(--color-primary); }
.btn-outline:hover { background: var(--color-primary); color: #fff; }
.btn-login { background: transparent; color: var(--color-text); border: 1px solid var(--color-border-strong); padding: 8px 16px; font-size: 13px; min-height: 38px; }
.btn-login:hover { border-color: var(--color-primary); color: var(--color-primary); }
.btn-register { background: var(--gradient-button); color: #fff; padding: 8px 16px; font-size: 13px; min-height: 38px; box-shadow: var(--shadow-button); }
.btn-register:hover { background: var(--gradient-button-hover); color: #fff; }

.nav-toggle { display: none; flex: 0 0 40px; width: 40px; height: 40px; align-items: center; justify-content: center; background: none; border: 1px solid var(--color-border); border-radius: var(--radius-sm); cursor: pointer; padding: 0; }
.hamburger { display: block; width: 20px; height: 2px; background: var(--color-text); position: relative; transition: background var(--motion-fast); }
.hamburger::before, .hamburger::after { content: ''; display: block; width: 20px; height: 2px; background: var(--color-text); position: absolute; left: 0; transition: transform var(--motion-normal) var(--ease-out); }
.hamburger::before { top: -6px; }
.hamburger::after { top: 6px; }

/* Mobile Menu */
.mobile-menu { position: fixed; top: var(--mobile-header-h); left: 0; right: 0; bottom: 0; background: rgba(255,255,255,.98); backdrop-filter: blur(16px); z-index: 999; display: none; overflow-y: auto; padding: 20px; }
.mobile-menu.is-open { display: block; }
.mobile-menu-inner { display: flex; flex-direction: column; gap: 4px; }
.mobile-menu a { display: block; padding: 14px 16px; font-size: 16px; color: var(--color-text); font-weight: 500; border-radius: var(--radius-sm); transition: background var(--motion-fast); }
.mobile-menu a:hover { background: var(--color-primary-soft); color: var(--color-primary); }

@media (max-width: 1180px) {
  .primary-nav { display: none; }
  .nav-toggle { display: inline-flex; }
  .header-inner { padding-left: clamp(8px, 2.4vw, 14px); padding-right: clamp(8px, 2.4vw, 14px); min-height: var(--mobile-header-h); gap: clamp(6px, 1.8vw, 10px); }
  .brand-wrap { margin-right: 0; }
  .site-logo { height: clamp(30px, 8vw, 40px); max-width: clamp(104px, 27vw, 138px); }
  .header-actions { margin-left: auto; gap: clamp(5px, 1.6vw, 8px); }
  .header-actions .btn { min-height: 38px; padding-inline: clamp(10px, 2.6vw, 14px); font-size: clamp(12px, 3.2vw, 14px); }
  .nav-toggle { flex-basis: 40px; margin-left: 2px; }
}

@media (max-width: 375px) {
  .header-inner { padding-left: 8px; padding-right: 8px; gap: 6px; }
  .site-logo { max-width: 104px; }
  .header-actions .btn { min-height: 36px; padding-inline: 8px; font-size: 12px; }
  .nav-toggle { flex-basis: 36px; width: 36px; height: 36px; }
}

/* ============================================================ SECTIONS ============================================================ */
section { padding: var(--section-y) 0; }
.section-alt { background: var(--color-bg-soft); }

/* Hero */
.home-hero { background: var(--gradient-hero); color: #fff; padding: clamp(60px, 8vw, 100px) 0; }
.hero-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 40px; align-items: center; }
.hero-text h1 { font-size: var(--fs-h1); line-height: var(--lh-heading); margin-bottom: 20px; }
.hero-lead { font-size: 18px; line-height: 1.7; opacity: .92; margin-bottom: 28px; }
.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 20px; }
.hero-cta .btn-outline { border-color: rgba(255,255,255,.5); color: #fff; }
.hero-cta .btn-outline:hover { background: rgba(255,255,255,.15); border-color: #fff; }
.hero-trust { font-size: 14px; opacity: .8; }
.hero-img { border-radius: var(--radius-lg); box-shadow: 0 20px 60px rgba(0,0,0,.3); }

/* Trust Strip */
.home-trust-strip { padding: 24px 0; background: var(--color-surface); border-bottom: 1px solid var(--color-border); }
.trust-grid { display: flex; justify-content: center; gap: clamp(20px, 4vw, 48px); flex-wrap: wrap; }
.trust-item { display: flex; align-items: center; gap: 8px; font-size: 14px; font-weight: 500; color: var(--color-text-soft); }
.trust-icon { font-size: 20px; }

/* Content Layout */
h2 { font-size: var(--fs-h2); line-height: var(--lh-heading); margin-bottom: 16px; color: var(--color-secondary); }
h3 { font-size: var(--fs-h3); line-height: var(--lh-heading); margin-bottom: 12px; margin-top: 28px; color: var(--color-text); }
.prose { max-width: 820px; }
.prose p { margin-bottom: 18px; }
.content-split { display: grid; grid-template-columns: 1.1fr .9fr; gap: 36px; align-items: start; }
.content-img, .section-img, .showcase-img, .about-img, .policy-img { margin: 28px 0; border-radius: var(--radius-md); box-shadow: var(--shadow-card); }

/* Cards */
.strength-grid, .game-showcase, .promo-grid, .provider-grid, .guide-grid, .promo-showcase, .value-grid, .channel-grid { display: grid; gap: 20px; margin: 28px 0; }
.strength-grid { grid-template-columns: repeat(3, 1fr); }
.game-showcase { grid-template-columns: repeat(3, 1fr); }
.promo-grid, .value-grid { grid-template-columns: repeat(3, 1fr); }
.provider-grid { grid-template-columns: repeat(2, 1fr); }
.guide-grid { grid-template-columns: repeat(2, 1fr); }
.promo-showcase { grid-template-columns: repeat(2, 1fr); }
.channel-grid { grid-template-columns: repeat(3, 1fr); }

.strength-card, .game-card, .promo-card, .provider-card, .guide-card, .promo-feature-card, .value-card, .channel-card {
  background: var(--color-card); border: 1px solid var(--color-border); border-radius: var(--radius-card); padding: 24px; transition: transform var(--motion-normal) var(--ease-out), box-shadow var(--motion-normal);
}
.strength-card:hover, .game-card:hover, .promo-card:hover, .provider-card:hover, .guide-card:hover, .promo-feature-card:hover, .value-card:hover, .channel-card:hover {
  transform: translateY(-4px); box-shadow: var(--shadow-card-hover);
}
.strength-icon { font-size: 32px; margin-bottom: 12px; }
.card-link { display: inline-block; margin-top: 12px; font-weight: 600; font-size: 14px; color: var(--color-primary); }
.section-cta-link { display: inline-block; margin-top: 20px; font-weight: 600; color: var(--color-primary); font-size: 16px; }

/* Steps */
.step-flow { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin: 28px 0; }
.step-card { background: var(--color-card); border: 1px solid var(--color-border); border-radius: var(--radius-card); padding: 24px; position: relative; }
.step-num { display: inline-flex; align-items: center; justify-content: center; width: 36px; height: 36px; border-radius: 50%; background: var(--gradient-button); color: #fff; font-weight: 700; font-size: 16px; margin-bottom: 12px; }
.steps-list { margin: 24px 0; }
.step-item { padding: 20px; background: var(--color-card); border-left: 4px solid var(--color-primary); border-radius: 0 var(--radius-sm) var(--radius-sm) 0; margin-bottom: 16px; box-shadow: var(--shadow-soft); }
.step-marker { display: inline-block; background: var(--color-primary); color: #fff; padding: 4px 12px; border-radius: var(--radius-pill); font-size: 13px; font-weight: 600; margin-bottom: 8px; }

/* FAQ */
.faq-list { margin: 24px 0; }
.faq-item { border: 1px solid var(--color-border); border-radius: var(--radius-md); margin-bottom: 10px; overflow: hidden; background: var(--color-card); }
.faq-trigger { display: flex; justify-content: space-between; align-items: center; width: 100%; padding: 18px 20px; background: none; border: none; cursor: pointer; font-size: 16px; font-weight: 600; color: var(--color-text); text-align: left; font-family: inherit; line-height: 1.4; transition: background var(--motion-fast); }
.faq-trigger:hover { background: var(--color-primary-soft); }
.faq-icon { font-size: 22px; font-weight: 300; color: var(--color-primary); transition: transform var(--motion-normal); flex-shrink: 0; margin-left: 12px; }
.faq-item.is-open .faq-icon { transform: rotate(45deg); }
.faq-answer { display: none; padding: 0 20px 18px; color: var(--color-text-soft); line-height: 1.8; }
.faq-item.is-open .faq-answer { display: block; }

/* Breadcrumb */
.breadcrumb { font-size: 14px; color: var(--color-text-muted); margin-bottom: 16px; }
.breadcrumb a { color: var(--color-primary); }

/* CTA */
.cta-bar { text-align: center; margin-top: 28px; }
.cta-panel { display: grid; grid-template-columns: .4fr .6fr; gap: 36px; align-items: center; background: var(--gradient-cta); border-radius: var(--radius-xl); padding: 48px; color: #fff; }
.cta-visual { border-radius: var(--radius-lg); }
.cta-buttons { display: flex; gap: 14px; flex-wrap: wrap; margin: 20px 0; }
.cta-note { font-size: 14px; opacity: .8; }

/* Category pages */
.cat-header { background: var(--gradient-hero); color: #fff; padding: clamp(40px, 5vw, 60px) 0; }
.cat-header .breadcrumb { color: rgba(255,255,255,.7); }
.cat-header .breadcrumb a { color: rgba(255,255,255,.9); }
.cat-lead { font-size: 17px; line-height: 1.7; opacity: .9; max-width: 720px; }

/* Page headers for non-category */
.page-header, .guide-header, .promo-header, .about-header, .contact-header, .policy-header { background: var(--gradient-hero-soft); padding: clamp(36px, 4vw, 56px) 0; border-bottom: 1px solid var(--color-border); }
.page-lead { font-size: 17px; color: var(--color-text-soft); max-width: 720px; line-height: 1.7; }

/* Policy */
.policy-updated { font-size: 14px; color: var(--color-text-muted); margin-top: 8px; }
.policy-body { max-width: 820px; }
.policy-body h2 { margin-top: 36px; }
.policy-body p { margin-bottom: 16px; }

/* Related links */
.related-links { margin: 16px 0; }
.related-links li { padding: 8px 0; border-bottom: 1px solid var(--color-border); }
.related-links li:last-child { border-bottom: none; }
.related-links a { font-weight: 600; }

/* Tips/Safety lists */
.tips-list, .safety-list { margin: 16px 0 24px; padding-left: 0; }
.tips-list li, .safety-list li { padding: 10px 0 10px 24px; position: relative; color: var(--color-text-soft); }
.tips-list li::before, .safety-list li::before { content: "✓"; position: absolute; left: 0; color: var(--color-primary); font-weight: 700; }

/* Error page */
.error-section { text-align: center; padding: 80px 0; }
.error-section h1 { font-size: 96px; color: var(--color-primary); opacity: .3; }
.error-section h2 { font-size: 28px; margin: 16px 0; }
.error-actions { display: flex; gap: 14px; justify-content: center; margin-top: 28px; flex-wrap: wrap; }

/* ============================================================ FOOTER ============================================================ */
.site-footer { background: var(--color-footer-bg); color: var(--color-footer-text); padding: 56px 0 0; }
.footer-top { display: grid; grid-template-columns: 1.2fr 2fr; gap: 48px; padding-bottom: 40px; border-bottom: 1px solid rgba(255,255,255,.1); }
.footer-brand { }
.footer-logo { border-radius: 0; margin-bottom: 16px; opacity: .9; }
.footer-desc { font-size: 15px; line-height: 1.7; color: var(--color-text-muted); }
.footer-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.footer-col h4 { font-size: 16px; font-weight: 700; color: #fff; margin-bottom: 16px; }
.footer-col ul li { margin-bottom: 10px; }
.footer-col a { color: var(--color-footer-text); font-size: 14px; transition: color var(--motion-fast); }
.footer-col a:hover { color: #fff; }
.footer-bottom { padding: 24px 0; text-align: center; font-size: 13px; color: var(--color-text-muted); }
.footer-contact { margin: 6px 0; }
.footer-links-bottom { margin-top: 8px; }
.footer-links-bottom a { color: var(--color-text-muted); margin: 0 10px; }
.footer-links-bottom a:hover { color: #fff; }

/* ============================================================ RESPONSIVE ============================================================ */
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; text-align: center; }
  .hero-visual { order: -1; max-width: 400px; margin: 0 auto; }
  .content-split { grid-template-columns: 1fr; }
  .strength-grid, .game-showcase, .promo-grid, .value-grid { grid-template-columns: repeat(2, 1fr); }
  .step-flow { grid-template-columns: repeat(2, 1fr); }
  .channel-grid { grid-template-columns: 1fr; }
  .cta-panel { grid-template-columns: 1fr; text-align: center; padding: 32px 24px; }
  .footer-top { grid-template-columns: 1fr; gap: 32px; }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  .strength-grid, .game-showcase, .promo-grid, .provider-grid, .guide-grid, .promo-showcase, .value-grid { grid-template-columns: 1fr; }
  .step-flow { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  section { padding: var(--section-y-sm) 0; }
}

@media (max-width: 414px) {
  .hero-cta { flex-direction: column; }
  .hero-cta .btn { width: 100%; }
  .error-actions { flex-direction: column; }
}