/* ==========================================================================
   TVSI 20 NĂM — CRIMSON PRESTIGE & WARM IVORY DESIGN SYSTEM
   Editorial CSR & Financial Engagement Platform
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Nunito:ital,wght@0,300;0,400;0,500;0,600;0,700;0,800;0,900;1,400;1,700&display=swap');

:root {
  /* ------------------------------------------------------------------------
     01. SURFACES & CANVAS — WARM ALABASTER / IVORY
     ------------------------------------------------------------------------ */
  --color-paper:          #FBF9F5; /* Canvas nền trang: ấm áp như giấy in mỹ thuật */
  --color-paper-card:     #FFFFFF; /* Bề mặt thẻ card chính */
  --color-paper-subtle:   #F5F2EB; /* Bề mặt phụ, ô tab pill, background nhẹ */
  --color-paper-warm:     #EFECE4; /* Bề mặt nhấn ấm */
  --surface-canvas:       var(--color-paper);
  --surface-card:         var(--color-paper-card);
  --surface-subtle-card:  var(--color-paper-subtle);

  /* Deep Warm Dark Surfaces (Section Happy Day, Footer) */
  --color-charcoal-deep:  #141211; /* Đen ấm than củi cho footer */
  --color-charcoal-card:  #1C1917; /* Thẻ dark feature (Happy Day) */
  --color-charcoal-border:#2E2A27; /* Viền thẻ dark */
  --surface-dark-surface: var(--color-charcoal-card);
  --surface-deep-dark:    var(--color-charcoal-deep);

  /* Warm Charcoal Scale Aliases */
  --color-obsidian:       #141211;
  --color-graphite:       #1C1917;
  --color-slate:          #2E2A27;
  --color-ash:            #D6D3D1;
  --color-fog:            #A8A29E;
  --color-silver:         #E7E5E4;


  /* ------------------------------------------------------------------------
     02. INK & TYPOGRAPHY — DEEP WARM STONE
     ------------------------------------------------------------------------ */
  --color-ink:            #1C1917; /* Tiêu đề, số liệu chính - đen than củi ấm áp */
  --color-ink-secondary:  #44403C; /* Đoạn văn, phụ đề, nhãn chính */
  --color-ink-muted:      #78716C; /* Helper text, metadata, icon outlines */
  --color-ink-light:      #A8A29E; /* Placeholder, đường dẫn thứ cấp */
  
  --text-primary:         var(--color-ink);
  --text-secondary:       var(--color-ink-secondary);
  --text-muted:           var(--color-ink-muted);
  --text-light:           var(--color-ink-light);
  --text-white:           #FFFFFF;

  /* ------------------------------------------------------------------------
     03. ACCENTS — TVSI CRIMSON RED & AMBER GOLD
     ------------------------------------------------------------------------ */
  /* Brand Heritage: TVSI Crimson Red */
  --color-accent:         #C81E25; /* TVSI Crimson Red chuẩn */
  --color-accent-dark:    #A8151B; /* Hover state */
  --color-accent-light:   rgba(200, 30, 37, 0.06); /* Tint phớt nền */
  --color-accent-border:  rgba(200, 30, 37, 0.22);
  --color-accent-glow:    rgba(200, 30, 37, 0.32);

  /* CSR Bridge & Community: Amber Gold */
  --color-gold:           #D97706; /* Hổ phách nhịp cầu */
  --color-gold-bright:    #F59E0B; /* Điểm tích lũy, ngôi sao */
  --color-gold-light:     #FEF3C7; /* Nền huy hiệu */
  --color-gold-border:    rgba(245, 158, 11, 0.28);

  /* Legacy Compat */
  --tvsi-red:             var(--color-accent);
  --tvsi-red-dark:        var(--color-accent-dark);
  --tvsi-red-light:       #FFF1F2;
  --tvsi-red-subtle:      var(--color-accent-light);
  --tvsi-red-glow:        var(--color-accent-glow);
  --tvsi-gold:            var(--color-gold-bright);
  --tvsi-gold-light:      var(--color-gold-light);

  /* ------------------------------------------------------------------------
     04. HAIRLINE RULES & DIVIDERS — WARM STONE
     ------------------------------------------------------------------------ */
  --color-rule:           #E7E5E4; /* Hairline 1px viền thẻ card */
  --color-rule-subtle:    #F0EDE6; /* Đường viền nội bộ */
  --border-light:         var(--color-rule);
  --border-subtle:        var(--color-rule-subtle);

  /* ------------------------------------------------------------------------
     05. TYPOGRAPHY SYSTEM — DM SANS
     ------------------------------------------------------------------------ */
  --font-cosmica:         'Nunito', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-script:          'Ms Madi', 'Playwrite VN', cursive;
  --font-base:            var(--font-cosmica);
  --font-display:         var(--font-cosmica);
  --font-num:             var(--font-cosmica);

  /* Typography Scale (+2px overall scale) */
  --text-caption:         14px;
  --leading-caption:      1.6;
  --text-body:            17px;
  --leading-body:         1.65;
  --text-body-lg:         19px;
  --leading-body-lg:      1.5;
  --text-subheading:      22px;
  --leading-subheading:   1.4;
  --text-heading-sm:      34px;
  --leading-heading-sm:   1.3;
  --text-heading:         42px;
  --leading-heading:      1.22;
  --text-heading-lg:      58px;
  --leading-heading-lg:   1.15;
  --text-display:         66px;
  --leading-display:      1.10;

  /* Font Weights */
  --font-weight-light:    300;
  --font-weight-regular:  400;
  --font-weight-medium:   500;
  --font-weight-semibold: 600;
  --font-weight-bold:     700;

  /* ------------------------------------------------------------------------
     06. GEOMETRY — 36PX CARDS / 14PX BUTTONS / 10000PX PILLS
     ------------------------------------------------------------------------ */
  --radius-cards:         36px;
  --radius-card:          36px;
  --radius-icons:         40px;
  --radius-pills:         10000px;
  --radius-pill:          10000px;
  --radius-badges:        12px;
  --radius-badge:         12px;
  --radius-inputs:        14px;
  --radius-input:         14px;
  --radius-buttons:       14px;
  --radius-btn:           14px;
  --radius-tile:          24px;
  --radius-full:          10000px;

  /* Layout Spacing */
  --page-max-width:       1200px;
  --section-gap:          84px;
  --card-padding:         32px;

  /* ------------------------------------------------------------------------
     07. ELEVATION & SHADOWS
     ------------------------------------------------------------------------ */
  --shadow-card:          none; /* Giữ hairline 1px thanh lịch */
  --shadow-card-hover:    0 16px 36px -10px rgba(28, 25, 23, 0.08), 0 2px 6px -1px rgba(28, 25, 23, 0.02);
  --shadow-btn-primary:   0 4px 16px -2px rgba(200, 30, 37, 0.35), inset 0 1px 0 rgba(255, 255, 255, 0.25);
  --shadow-btn-hover:     0 8px 24px -2px rgba(200, 30, 37, 0.50), inset 0 1px 0 rgba(255, 255, 255, 0.35);
  --shadow-btn-ghost:     0 2px 6px rgba(28, 25, 23, 0.04);

  /* ------------------------------------------------------------------------
     08. FLUID ANIMATION CURVES & TRANSITIONS
     ------------------------------------------------------------------------ */
  --ease-spring:          cubic-bezier(0.16, 1, 0.3, 1);
  --ease-soft:            cubic-bezier(0.25, 1, 0.5, 1);
  --transition-fast:      0.18s ease;
  --transition-normal:    0.32s var(--ease-spring);
  --transition-slow:      0.65s var(--ease-spring);
}

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

html {
  font-family: var(--font-cosmica);
  font-size: 17px;
  line-height: var(--leading-body);
  color: var(--color-ink-secondary);
  background-color: var(--surface-canvas);
  scroll-behavior: smooth;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
  background-color: var(--surface-canvas);
  color: var(--color-ink-secondary);
  font-family: var(--font-cosmica);
}

img, svg {
  display: block;
  max-width: 100%;
}

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

button {
  font-family: inherit;
  border: none;
  background: none;
  cursor: pointer;
  outline: none;
}

/* Typography Helpers */
.font-num {
  font-family: var(--font-cosmica);
  font-feature-settings: "tnum" 1;
}

/* Layout Containers */
.container {
  width: 100%;
  max-width: var(--page-max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 28px;
  padding-right: 28px;
}

.section-spacing {
  padding-top: var(--section-gap);
  padding-bottom: var(--section-gap);
}

@media (max-width: 768px) {
  .container {
    padding-left: 20px;
    padding-right: 20px;
  }
  .section-spacing {
    padding-top: 56px;
    padding-bottom: 56px;
  }
}

/* ==========================================================================
   BUTTONS & PILLS — CRIMSON PRESTIGE VOICE
   ========================================================================== */

/* Primary Action Button (TVSI Crimson Filled with Spring Hover) */
.btn-primary,
.btn-action-primary,
.hero-cta-btn,
.btn-sim-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  background: var(--color-accent);
  color: #FFFFFF !important;
  font-family: var(--font-cosmica);
  font-size: 14.5px;
  font-weight: 600;
  border-radius: var(--radius-buttons);
  padding: 13px 26px;
  border: 1px solid var(--color-accent-dark);
  box-shadow: var(--shadow-btn-primary);
  transition: all var(--transition-normal);
  white-space: nowrap;
  cursor: pointer;
  text-decoration: none;
  position: relative;
  overflow: hidden;
}

.btn-primary::before,
.hero-cta-btn::before,
.btn-sim-action::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left 0.6s ease;
}

.btn-primary:hover::before,
.hero-cta-btn:hover::before,
.btn-sim-action:hover::before {
  left: 100%;
}

.btn-primary:hover,
.hero-cta-btn:hover,
.btn-sim-action:hover {
  background-color: var(--color-accent-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-btn-hover);
}

.btn-primary:active,
.hero-cta-btn:active,
.btn-sim-action:active {
  transform: translateY(0);
}

/* Secondary / Ghost Action Button (Warm White Surface) */
.btn-ghost,
.btn-secondary-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: var(--color-paper-card);
  color: var(--color-ink) !important;
  font-family: var(--font-cosmica);
  font-size: 14px;
  font-weight: 500;
  border-radius: var(--radius-buttons);
  padding: 12px 22px;
  border: 1px solid var(--color-rule);
  box-shadow: var(--shadow-btn-ghost);
  transition: all var(--transition-normal);
  white-space: nowrap;
  cursor: pointer;
  text-decoration: none;
}

.btn-ghost:hover,
.btn-secondary-pill:hover {
  border-color: var(--color-accent-border);
  color: var(--color-accent) !important;
  background-color: #FFFFFF;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(28, 25, 23, 0.06);
}

/* Badges & Chips */
.tag-pill-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--color-paper-card);
  border: 1px solid var(--color-rule);
  color: var(--color-ink);
  border-radius: var(--radius-badges);
  padding: 5px 12px;
  font-size: 12.5px;
  font-weight: 500;
  line-height: 1.4;
  transition: border-color var(--transition-fast);
}

.badge-crimson {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--color-accent-light);
  color: var(--color-accent) !important;
  border: 1px solid var(--color-accent-border);
  border-radius: var(--radius-badges);
  padding: 4px 10px;
  font-size: 12px;
  font-weight: 600;
}

.badge-amber {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--color-gold-light);
  color: #B45309 !important;
  border: 1px solid var(--color-gold-border);
  border-radius: var(--radius-badges);
  padding: 4px 10px;
  font-size: 12px;
  font-weight: 600;
}

/* Section Header Typography */
.section-header {
  margin-bottom: 40px;
}

.section-kicker {
  font-family: var(--font-cosmica);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 10px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.section-title {
  font-family: var(--font-cosmica);
  font-size: clamp(32px, 3.4vw, 42px);
  font-weight: 700;
  line-height: var(--leading-heading);
  color: var(--color-ink);
  letter-spacing: -0.025em;
}

.section-subtitle {
  font-size: 15.5px;
  line-height: var(--leading-body);
  color: var(--color-ink-muted);
  max-width: 640px;
  margin-top: 12px;
}

/* ==========================================================================
   SMOOTH SCROLL REVEAL KEYFRAMES & INTERACTION UTILITIES
   ========================================================================== */
@keyframes revealFadeUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.reveal-fade-up {
  animation: revealFadeUp 0.6s var(--ease-spring) forwards;
}

/* ==========================================================================
   SMOOTH BIDIRECTIONAL SCROLL REVEAL SYSTEM (Cuộn lên & cuộn xuống mượt mà)
   ========================================================================== */
html.js-ready .reveal-on-scroll {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

html.js-ready .reveal-on-scroll.revealed {
  opacity: 1;
  transform: translateY(0);
}

/* Staggered entrance for internal cards and components */
html.js-ready .reveal-on-scroll .compare-pane,
html.js-ready .reveal-on-scroll .eco-showcase-card,
html.js-ready .reveal-on-scroll .eco-grid-card,
html.js-ready .reveal-on-scroll .top10-banner-wrapper,
html.js-ready .reveal-on-scroll .metric-stat-card,
html.js-ready .reveal-on-scroll .leaderboard-showcase-card,
html.js-ready .reveal-on-scroll .interactive-calculator-card,
html.js-ready .reveal-on-scroll .bridge-panoramic-card,
html.js-ready .reveal-on-scroll .closing-action-card,
html.js-ready .reveal-on-scroll .rules-simple-container {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.75s cubic-bezier(0.16, 1, 0.3, 1), transform 0.75s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.3s ease, border-color 0.25s ease;
  will-change: opacity, transform;
}

html.js-ready .reveal-on-scroll.revealed .compare-pane,
html.js-ready .reveal-on-scroll.revealed .eco-showcase-card,
html.js-ready .reveal-on-scroll.revealed .eco-grid-card,
html.js-ready .reveal-on-scroll.revealed .top10-banner-wrapper,
html.js-ready .reveal-on-scroll.revealed .metric-stat-card,
html.js-ready .reveal-on-scroll.revealed .leaderboard-showcase-card,
html.js-ready .reveal-on-scroll.revealed .interactive-calculator-card,
html.js-ready .reveal-on-scroll.revealed .bridge-panoramic-card,
html.js-ready .reveal-on-scroll.revealed .closing-action-card,
html.js-ready .reveal-on-scroll.revealed .rules-simple-container {
  opacity: 1;
  transform: translateY(0);
}

/* Specific entrance spring bounce for Section 5 bridge elements */
html.js-ready .reveal-on-scroll .bridge-pin {
  opacity: 0;
  transform: translateX(-50%) translateY(28px) scale(0.85);
  transition: opacity 0.75s cubic-bezier(0.34, 1.56, 0.64, 1), transform 0.75s cubic-bezier(0.34, 1.56, 0.64, 1);
  will-change: opacity, transform;
}

html.js-ready .reveal-on-scroll.revealed .bridge-pin {
  opacity: 1;
  transform: translateX(-50%) translateY(0) scale(1);
}

html.js-ready .reveal-on-scroll .milestone-title-badge,
html.js-ready .reveal-on-scroll .bridge-tag-calligraphy {
  opacity: 0;
  transform: translateY(-16px);
  transition: opacity 0.6s ease, transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

html.js-ready .reveal-on-scroll.revealed .milestone-title-badge,
html.js-ready .reveal-on-scroll.revealed .bridge-tag-calligraphy {
  opacity: 1;
  transform: translateY(0);
}


/* Stagger delays for Section 2 (Compare panes) */
html.js-ready .reveal-on-scroll.revealed .compare-pane-before { transition-delay: 0.1s; }
html.js-ready .reveal-on-scroll.revealed .compare-pane-after { transition-delay: 0.22s; }

/* Stagger delays for Section 3 (Ecosystem cards & Top 10 banner) */
html.js-ready .reveal-on-scroll.revealed .eco-showcase-card { transition-delay: 0.1s; }
html.js-ready .reveal-on-scroll.revealed .eco-grid-card:nth-child(1) { transition-delay: 0.12s; }
html.js-ready .reveal-on-scroll.revealed .eco-grid-card:nth-child(2) { transition-delay: 0.18s; }
html.js-ready .reveal-on-scroll.revealed .eco-grid-card:nth-child(3) { transition-delay: 0.24s; }
html.js-ready .reveal-on-scroll.revealed .eco-grid-card:nth-child(4) { transition-delay: 0.30s; }
html.js-ready .reveal-on-scroll.revealed .top10-banner-wrapper { transition-delay: 0.35s; }

/* Stagger delays for Section 4 (Metrics stats cards) */
html.js-ready .reveal-on-scroll.revealed .metric-stat-card:nth-child(1) { transition-delay: 0.08s; }
html.js-ready .reveal-on-scroll.revealed .metric-stat-card:nth-child(2) { transition-delay: 0.16s; }
html.js-ready .reveal-on-scroll.revealed .metric-stat-card:nth-child(3) { transition-delay: 0.24s; }
html.js-ready .reveal-on-scroll.revealed .metric-stat-card:nth-child(4) { transition-delay: 0.32s; }
html.js-ready .reveal-on-scroll.revealed .leaderboard-showcase-card { transition-delay: 0.18s; }
html.js-ready .reveal-on-scroll.revealed .interactive-calculator-card { transition-delay: 0.26s; }

/* Stagger delays for Section 5 (Journey bridge panoramic card & pins) */
html.js-ready .reveal-on-scroll.revealed .bridge-panoramic-card { transition-delay: 0.1s; }
html.js-ready .reveal-on-scroll.revealed .milestone-title-badge { transition-delay: 0.18s; }
html.js-ready .reveal-on-scroll.revealed .bridge-tag-calligraphy { transition-delay: 0.22s; }
html.js-ready .reveal-on-scroll.revealed .bridge-pin.pin-1 { transition-delay: 0.28s; }
html.js-ready .reveal-on-scroll.revealed .bridge-pin.pin-2 { transition-delay: 0.44s; }
html.js-ready .reveal-on-scroll.revealed .bridge-pin.pin-3 { transition-delay: 0.60s; }

/* Stagger delays for Section 6 (Closing card) */
html.js-ready .reveal-on-scroll.revealed .closing-action-card { transition-delay: 0.12s; }

/* Stagger delays for Section 7 (Rules container) */
html.js-ready .reveal-on-scroll.revealed .rules-simple-container { transition-delay: 0.12s; }

/* ==========================================================================
   STRICT EXCLUSION: Footer is strictly static (Never animated)
   ========================================================================== */
.tvsi-footer,
.tvsi-footer *,
#siteFooter,
#siteFooter * {
  animation: none !important;
  transition: none !important;
  opacity: 1 !important;
  transform: none !important;
}