/* ==========================================================================
   Hack2skill Innovation Dinner (Bangalore Edition II)
   Direction 1: Modern Tech Executive Standard (Stripe / OpenAI / Linear)
   ========================================================================== */

:root {
  --color-obsidian: #070709;
  --color-surface: #0d0d12;
  --color-surface-elevated: #13131a;
  --color-surface-card: #111117;
  --champagne-gradient: linear-gradient(135deg, #fcf8ee 0%, #e2c992 50%, #c49d47 100%);
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-champagne: rgba(226, 201, 146, 0.22);
}

html {
  background-color: var(--color-obsidian);
  color-scheme: dark;
}

body {
  background-color: var(--color-obsidian);
  min-height: 100vh;
  font-feature-settings: "cv02", "cv03", "cv04", "cv11";
}

/* Ambient Modern Lighting */
.modern-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(140px);
  pointer-events: none;
  opacity: 0.32;
}

.modern-glow-center {
  top: -15%;
  left: 50%;
  transform: translateX(-50%);
  width: min(850px, 95vw);
  height: 550px;
  background: radial-gradient(circle, rgba(226, 201, 146, 0.16) 0%, rgba(139, 92, 246, 0.1) 45%, transparent 75%);
}

.modern-glow-bottom {
  bottom: 5%;
  right: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.12) 0%, transparent 70%);
}

/* Subtle Grid Mesh */
.grid-mesh-overlay {
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(to right, rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(circle at 50% 30%, black 40%, transparent 80%);
  -webkit-mask-image: radial-gradient(circle at 50% 30%, black 40%, transparent 80%);
}

/* Vignette Overlay */
.vignette-overlay {
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at center, transparent 45%, rgba(7, 7, 9, 0.9) 100%);
}

/* Champagne Gradient Typography */
.champagne-gradient-text {
  background: var(--champagne-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

/* Floating Header on Scroll */
#main-header.scrolled {
  background: rgba(10, 10, 15, 0.92);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 0.75rem;
  padding-bottom: 0.75rem;
  box-shadow: 0 15px 35px -10px rgba(0, 0, 0, 0.85);
}

/* Modern Tech Card */
.tech-card {
  background: linear-gradient(160deg, rgba(19, 19, 27, 0.7) 0%, rgba(13, 13, 18, 0.85) 100%);
  border: 1px solid var(--border-subtle);
  backdrop-filter: blur(16px);
  box-shadow: 0 20px 40px -15px rgba(0, 0, 0, 0.75), inset 0 1px 0 0 rgba(255, 255, 255, 0.06);
  transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.35s ease, box-shadow 0.35s ease;
}

.tech-card:hover {
  transform: translateY(-3px);
  border-color: rgba(226, 201, 146, 0.35);
  box-shadow: 0 25px 50px -10px rgba(0, 0, 0, 0.9), 0 0 30px -5px rgba(226, 201, 146, 0.12);
}

.tech-card .card-border-glow {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(226, 201, 146, 0.5), transparent);
  opacity: 0;
  transition: opacity 0.4s ease;
}

.tech-card:hover .card-border-glow {
  opacity: 1;
}

/* Timeline Rows */
.timeline-row {
  transition: transform 0.3s ease, border-color 0.3s ease, background 0.3s ease;
}

.timeline-row:hover {
  transform: translateX(4px);
  border-color: rgba(226, 201, 146, 0.3);
  background: rgba(19, 19, 26, 0.9);
}

/* Modern Action Buttons */
.btn-champagne {
  background: var(--champagne-gradient);
  color: #08070b;
  font-weight: 700;
  letter-spacing: 0.16em;
  transition: transform 0.25s ease, box-shadow 0.25s ease, filter 0.25s ease;
  position: relative;
  overflow: hidden;
}

.btn-champagne::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.35), transparent);
  transition: left 0.6s ease;
}

.btn-champagne:hover {
  transform: translateY(-2px);
  filter: brightness(1.04);
  box-shadow: 0 12px 35px rgba(212, 179, 108, 0.32);
}

.btn-champagne:hover::before {
  left: 100%;
}

.btn-champagne-outline {
  background: rgba(226, 201, 146, 0.08);
  border: 1px solid rgba(226, 201, 146, 0.35);
  color: #f5edd8;
  transition: all 0.25s ease;
}

.btn-champagne-outline:hover {
  background: rgba(226, 201, 146, 0.2);
  border-color: rgba(226, 201, 146, 0.65);
  color: #ffffff;
  transform: translateY(-1px);
}

.btn-modern-outline {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: #e5e5eb;
  transition: all 0.25s ease;
}

.btn-modern-outline:hover {
  background: rgba(255, 255, 255, 0.07);
  border-color: rgba(226, 201, 146, 0.35);
  color: #ffffff;
  transform: translateY(-1px);
}

/* Custom Modern Scrollbar */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: #070709;
}

::-webkit-scrollbar-thumb {
  background: #202029;
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: #d4b36c;
}