/**
 * SeverKey — Shared UI Theme v4.0
 * Glassmorphism · Deep 3D depth · Animated orb fallback · 60fps
 *
 * FIXES APPLIED:
 *  B11 – #bg3d-canvas opacity controlled here only (no inline JS)
 *  B7  – .sk-bg-fallback replaces old .bg-mesh everywhere
 */

/* ─────────────────────────────────────────────
   DESIGN TOKENS
───────────────────────────────────────────── */
:root {
  /* Backgrounds */
  --sk-bg:       #07080f;
  --sk-bg2:      #0c0e1a;
  --sk-bg3:      #0f1120;

  /* Surfaces (glassmorphism) */
  --sk-surface:  rgba(255, 255, 255, 0.04);
  --sk-surface2: rgba(255, 255, 255, 0.07);
  --sk-surface3: rgba(255, 255, 255, 0.11);

  /* Borders */
  --sk-border:   rgba(255, 255, 255, 0.09);
  --sk-border2:  rgba(255, 255, 255, 0.14);

  /* Text */
  --sk-text:     #f0f0ff;
  --sk-text2:    #9ca3c7;
  --sk-text3:    #64738a;

  /* Brand palette */
  --sk-accent:   #6c63ff;
  --sk-accent2:  #06b6d4;
  --sk-accent3:  #ec4899;
  --sk-accent4:  #8b5cf6;
  --sk-green:    #10b981;

  /* Glow / shadow */
  --sk-glow:     rgba(108, 99, 255, 0.35);
  --sk-glow2:    rgba(6, 182, 212, 0.25);
  --sk-glow3:    rgba(236, 72, 153, 0.25);

  /* Cards */
  --sk-card:     rgba(12, 14, 28, 0.72);
  --sk-card2:    rgba(15, 18, 36, 0.85);
  --sk-shadow:   0 24px 64px rgba(0, 0, 0, 0.50);
  --sk-shadow2:  0 8px 32px  rgba(0, 0, 0, 0.35);

  /* Layout */
  --sk-radius:   20px;
  --sk-radius2:  14px;
  --sk-blur:     blur(22px) saturate(160%);
  --sk-blur2:    blur(14px) saturate(140%);

  /* Gradients */
  --sk-grad-brand:   linear-gradient(135deg, var(--sk-accent)  0%, var(--sk-accent4) 50%, var(--sk-accent3) 100%);
  --sk-grad-cyan:    linear-gradient(135deg, var(--sk-accent)  0%, var(--sk-accent2) 100%);
  --sk-grad-surface: linear-gradient(135deg, rgba(255,255,255,0.06) 0%, rgba(255,255,255,0.02) 100%);
}

/* ── Light mode overrides ── */
[data-theme="light"] {
  --sk-bg:      #eef0ff;
  --sk-bg2:     #e4e8ff;
  --sk-bg3:     #dde2ff;
  --sk-surface:  rgba(255, 255, 255, 0.65);
  --sk-surface2: rgba(255, 255, 255, 0.80);
  --sk-surface3: rgba(255, 255, 255, 0.90);
  --sk-border:   rgba(108, 99, 255, 0.15);
  --sk-border2:  rgba(108, 99, 255, 0.25);
  --sk-text:     #12122a;
  --sk-text2:    #5a5a7a;
  --sk-text3:    #8888aa;
  --sk-glow:     rgba(108, 99, 255, 0.18);
  --sk-card:     rgba(255, 255, 255, 0.78);
  --sk-card2:    rgba(255, 255, 255, 0.92);
  --sk-shadow:   0 16px 48px rgba(108, 99, 255, 0.12);
  --sk-shadow2:  0 6px 20px  rgba(108, 99, 255, 0.08);
}

/* ─────────────────────────────────────────────
   BASE PAGE
───────────────────────────────────────────── */
.sk-page {
  background: var(--sk-bg) url('/assets/anime_cosmic_hero.jpg') no-repeat center center fixed;
  background-size: cover;
  color: var(--sk-text);
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  animation: cosmicHeroFloat 10s ease-in-out infinite alternate;
}

@keyframes cosmicHeroFloat {
  0% {
    background-position: center center;
    filter: brightness(1) contrast(1.05);
  }
  50% {
    background-position: center calc(50% - 12px);
    filter: brightness(1.12) contrast(1.1) drop-shadow(0 0 25px rgba(6,182,212,0.4));
  }
  100% {
    background-position: center calc(50% + 8px);
    filter: brightness(1.05) contrast(1.05);
  }
}

/* Layered gradient vignette on top of WebGL canvas */
.sk-page::after {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse 80% 50% at 50% -10%, rgba(108, 99, 255, 0.13), transparent 58%),
    radial-gradient(ellipse 60% 40% at 100% 80%,  rgba(6, 182, 212, 0.09),  transparent 52%),
    radial-gradient(ellipse 50% 35% at 0%   60%,  rgba(236, 72, 153, 0.07), transparent 50%),
    linear-gradient(180deg, rgba(7, 8, 15, 0.30) 0%, rgba(7, 8, 15, 0.72) 100%);
}

[data-theme="light"] .sk-page::after {
  background:
    radial-gradient(ellipse 80% 50% at 50% -10%, rgba(108, 99, 255, 0.09), transparent 55%),
    linear-gradient(180deg, rgba(238, 240, 255, 0.15) 0%, rgba(238, 240, 255, 0.82) 100%);
}

/* ─────────────────────────────────────────────
   WEBGL CANVAS  (B11: opacity via CSS only)
───────────────────────────────────────────── */
#bg3d-canvas {
  position: fixed !important;
  top: 0; left: 0;
  width: 100vw; height: 100vh;
  z-index: 0;
  pointer-events: none;
  opacity: 0.78;
  transition: opacity 1.4s ease;
}

.sk-no-webgl #bg3d-canvas { display: none; }

/* ─────────────────────────────────────────────
   CSS FALLBACK ORBS  (B7: sole orb system)
───────────────────────────────────────────── */
.sk-bg-fallback {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
  opacity: 0;                          /* hidden when WebGL is active */
  transition: opacity 0.8s ease;
}

.sk-no-webgl .sk-bg-fallback { opacity: 1; }

.sk-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.30;
  animation: skOrbFloat 22s ease-in-out infinite;
  will-change: transform;
}

.sk-orb-1 {
  width: 580px; height: 580px;
  background: radial-gradient(circle, #6c63ff 0%, transparent 70%);
  top: -180px; left: -160px;
  animation-delay: 0s;
}
.sk-orb-2 {
  width: 500px; height: 500px;
  background: radial-gradient(circle, #06b6d4 0%, transparent 70%);
  bottom: -140px; right: -120px;
  animation-delay: -8s;
}
.sk-orb-3 {
  width: 380px; height: 380px;
  background: radial-gradient(circle, #ec4899 0%, transparent 70%);
  /* B4 fix carried over: no conflicting translate — top/left % positioning only */
  top: 42%; left: 58%;
  animation-delay: -14s;
}

@keyframes skOrbFloat {
  0%,  100% { transform: translate(0, 0)     scale(1);    }
  33%        { transform: translate(28px, -24px) scale(1.05); }
  66%        { transform: translate(-18px, 18px) scale(0.96); }
}

/* ─────────────────────────────────────────────
   CONTENT LAYER
───────────────────────────────────────────── */
.sk-content {
  position: relative;
  z-index: 2;
}

/* ─────────────────────────────────────────────
   GLASS CARD  (shared component)
───────────────────────────────────────────── */
.sk-glass {
  background: var(--sk-card);
  border: 1px solid var(--sk-border);
  border-radius: var(--sk-radius);
  backdrop-filter: var(--sk-blur);
  -webkit-backdrop-filter: var(--sk-blur);
  box-shadow:
    var(--sk-shadow),
    inset 0 1px 0 rgba(255, 255, 255, 0.07),
    inset 0 0 0 1px rgba(255, 255, 255, 0.03);
  position: relative;
  overflow: hidden;
}

/* Subtle shimmer gradient overlay on glass */
.sk-glass::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--sk-grad-surface);
  border-radius: inherit;
  pointer-events: none;
}

/* ─────────────────────────────────────────────
   GLASSMORPHIC NAVBAR
───────────────────────────────────────────── */
.sk-glass-nav {
  background: rgba(8, 10, 22, 0.55);
  backdrop-filter: blur(28px) saturate(190%);
  -webkit-backdrop-filter: blur(28px) saturate(190%);
  border-bottom: 1px solid var(--sk-border);
  box-shadow: 0 4px 32px rgba(0, 0, 0, 0.25);
}

[data-theme="light"] .sk-glass-nav {
  background: rgba(240, 240, 255, 0.72);
}

/* ─────────────────────────────────────────────
   TYPOGRAPHY HELPERS
───────────────────────────────────────────── */
.sk-gradient-text {
  background: var(--sk-grad-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.sk-gradient-text-cyan {
  background: var(--sk-grad-cyan);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ─────────────────────────────────────────────
   BUTTONS
───────────────────────────────────────────── */
.sk-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.875rem 2rem;
  border-radius: 999px;
  font-weight: 600;
  font-family: inherit;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s, filter 0.2s;
  position: relative;
  overflow: hidden;
}

.sk-btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.12), transparent 60%);
  border-radius: inherit;
  pointer-events: none;
}

.sk-btn:hover   { transform: translateY(-3px); filter: brightness(1.08); }
.sk-btn:active  { transform: translateY(-1px); }
/* FIX: Focus outline rõ ràng cho tất cả sk-btn (keyboard navigation) */
.sk-btn:focus-visible {
  outline: 2px solid rgba(255, 255, 255, 0.9);
  outline-offset: 3px;
  box-shadow: 0 0 0 4px rgba(108, 99, 255, 0.35);
}

.sk-btn-primary {
  background: linear-gradient(135deg, var(--sk-accent), var(--sk-accent4));
  color: #fff;
  box-shadow: 0 8px 32px rgba(108, 99, 255, 0.40);
}
.sk-btn-primary:hover  { box-shadow: 0 14px 44px rgba(108, 99, 255, 0.55); }

.sk-btn-cyan {
  background: linear-gradient(135deg, var(--sk-accent2), #0284c7);
  color: #fff;
  box-shadow: 0 8px 28px rgba(6, 182, 212, 0.35);
}
.sk-btn-cyan:hover { box-shadow: 0 14px 40px rgba(6, 182, 212, 0.50); }

.sk-btn-outline {
  background: var(--sk-surface);
  border: 1px solid var(--sk-border2);
  color: var(--sk-text);
  backdrop-filter: var(--sk-blur2);
}
.sk-btn-outline:hover { background: var(--sk-surface2); }

/* ─────────────────────────────────────────────
   GLOW BADGE
───────────────────────────────────────────── */
.sk-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 1rem;
  border-radius: 999px;
  background: rgba(108, 99, 255, 0.12);
  border: 1px solid rgba(108, 99, 255, 0.32);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.5px;
  color: var(--sk-accent);
}

.sk-badge-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--sk-green);
  animation: skPulse 2s ease-in-out infinite;
}

@keyframes skPulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: 0.45; transform: scale(1.4); }
}

/* ─────────────────────────────────────────────
   STAT / FEATURE CARDS  (3D tilt-ready)
───────────────────────────────────────────── */
.sk-card-3d {
  background: var(--sk-card);
  border: 1px solid var(--sk-border);
  border-radius: var(--sk-radius);
  backdrop-filter: var(--sk-blur);
  -webkit-backdrop-filter: var(--sk-blur);
  box-shadow: var(--sk-shadow), inset 0 1px 0 rgba(255, 255, 255, 0.06);
  transform-style: preserve-3d;
  transition: transform 0.35s cubic-bezier(.175,.885,.32,1.275), box-shadow 0.35s;
  position: relative;
  overflow: hidden;
}

.sk-card-3d::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--sk-grad-surface);
  pointer-events: none;
}

.sk-card-3d:hover {
  box-shadow:
    0 30px 64px rgba(0, 0, 0, 0.45),
    0 0 0 1px rgba(108, 99, 255, 0.18),
    inset 0 1px 0 rgba(255, 255, 255, 0.10);
}

/* ─────────────────────────────────────────────
   SECTION DIVIDER  (decorative gradient line)
───────────────────────────────────────────── */
.sk-divider {
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg,
    transparent 0%,
    rgba(108, 99, 255, 0.35) 30%,
    rgba(6, 182, 212, 0.35) 70%,
    transparent 100%);
  margin: 0 auto;
  max-width: 800px;
}

/* ─────────────────────────────────────────────
   FORM INPUTS  (used in login / panels)
───────────────────────────────────────────── */
.sk-input {
  width: 100%;
  padding: 0.8rem 1rem 0.8rem 2.7rem;
  background: rgba(15, 23, 42, 0.55);
  border: 1px solid var(--sk-border);
  border-radius: var(--sk-radius2);
  color: var(--sk-text);
  font-size: 0.9rem;
  font-family: inherit;
  outline: none;
  transition: border-color 0.25s, box-shadow 0.25s, background 0.25s;
}

.sk-input:focus {
  border-color: var(--sk-accent);
  background: rgba(15, 23, 42, 0.85);
  box-shadow: 0 0 0 4px rgba(108, 99, 255, 0.18);
}

/* ─────────────────────────────────────────────
   SCROLL REVEAL
───────────────────────────────────────────── */
.sk-reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}
.sk-reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ─────────────────────────────────────────────
   REDUCED MOTION
───────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  .sk-orb              { animation: none !important; }
  #bg3d-canvas         { display: none !important; }
  .sk-no-webgl .sk-bg-fallback { opacity: 1; }
  .sk-reveal           { opacity: 1 !important; transform: none !important; transition: none !important; }
  .sk-badge-dot        { animation: none !important; }
}

/* ─────────────────────────────────────────────
   RESPONSIVE
───────────────────────────────────────────── */
@media (max-width: 768px) {
  #bg3d-canvas   { opacity: 0.52; }
  .sk-orb-1      { width: 360px; height: 360px; }
  .sk-orb-2      { width: 300px; height: 300px; }
  .sk-orb-3      { width: 240px; height: 240px; }
}