/* ============================================================
   DevHack 2026 — Certificate Portal
   GDG on Campus IIMT Meerut
   Custom Design System & Animations
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=Space+Grotesk:wght@400;500;600;700&display=swap');

/* ── CSS Custom Properties ── */
:root {
  --gdg-blue: #4285F4;
  --gdg-red: #EA4335;
  --gdg-yellow: #FBBC05;
  --gdg-green: #34A853;
  --gdg-dark: #202124;
  --gdg-surface: #F8F9FA;
  --gdg-text: #3C4043;
  --gdg-text-secondary: #5F6368;
  --gdg-border: #DADCE0;
  --glass-bg: rgba(255, 255, 255, 0.82);
  --glass-border: rgba(255, 255, 255, 0.35);
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
}

/* ── Base Reset & Typography ── */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  margin: 0;
  padding: 0;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: 'Space Grotesk', 'Inter', sans-serif;
}

/* ── Animated Gradient Background ── */
.gradient-bg {
  background: linear-gradient(-45deg,
    #1a1a2e,
    #16213e,
    #0f3460,
    #1a1a2e,
    #162447
  );
  background-size: 400% 400%;
  animation: gradientShift 20s ease infinite;
  position: relative;
}

.gradient-bg::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(66, 133, 244, 0.15) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(234, 67, 53, 0.1) 0%, transparent 50%),
    radial-gradient(ellipse at 60% 80%, rgba(52, 168, 83, 0.1) 0%, transparent 50%),
    radial-gradient(ellipse at 30% 80%, rgba(251, 188, 5, 0.08) 0%, transparent 50%);
  pointer-events: none;
  z-index: 0;
}

@keyframes gradientShift {
  0%   { background-position: 0% 50%; }
  25%  { background-position: 50% 100%; }
  50%  { background-position: 100% 50%; }
  75%  { background-position: 50% 0%; }
  100% { background-position: 0% 50%; }
}

/* ── Floating Orbs (Decorative) ── */
.orb {
  position: fixed;
  border-radius: 50%;
  filter: blur(60px);
  opacity: 0.12;
  pointer-events: none;
  z-index: 0;
}

.orb-blue {
  width: 300px;
  height: 300px;
  background: var(--gdg-blue);
  top: 10%;
  left: 10%;
  animation: orbFloat1 12s ease-in-out infinite;
}

.orb-red {
  width: 250px;
  height: 250px;
  background: var(--gdg-red);
  top: 60%;
  right: 10%;
  animation: orbFloat2 15s ease-in-out infinite;
}

.orb-green {
  width: 200px;
  height: 200px;
  background: var(--gdg-green);
  bottom: 10%;
  left: 30%;
  animation: orbFloat3 18s ease-in-out infinite;
}

.orb-yellow {
  width: 180px;
  height: 180px;
  background: var(--gdg-yellow);
  top: 30%;
  right: 25%;
  animation: orbFloat1 14s ease-in-out infinite reverse;
}

@keyframes orbFloat1 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33%      { transform: translate(30px, -40px) scale(1.1); }
  66%      { transform: translate(-20px, 20px) scale(0.95); }
}

@keyframes orbFloat2 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33%      { transform: translate(-40px, 30px) scale(1.05); }
  66%      { transform: translate(25px, -35px) scale(0.9); }
}

@keyframes orbFloat3 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50%      { transform: translate(35px, -25px) scale(1.08); }
}

/* ── Glassmorphism Cards ── */
.glass-card {
  background: var(--glass-bg);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
}

.glass-card-dark {
  background: rgba(32, 33, 36, 0.82);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.35);
}

/* ── Keyframe Animations ── */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes fadeOut {
  from { opacity: 1; }
  to   { opacity: 0; }
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.92);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

@keyframes shimmer {
  0%   { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

@keyframes pulse-ring {
  0%   { transform: scale(0.9); opacity: 1; }
  100% { transform: scale(1.4); opacity: 0; }
}

@keyframes confetti-fall {
  0%   { transform: translateY(-10px) rotate(0deg); opacity: 1; }
  100% { transform: translateY(100vh) rotate(720deg); opacity: 0; }
}

/* ── Animation Utility Classes ── */
.animate-fade-in-up {
  animation: fadeInUp 0.65s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

.animate-fade-in {
  animation: fadeIn 0.45s ease-out forwards;
}

.animate-slide-down {
  animation: slideDown 0.45s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

.animate-slide-up {
  animation: slideUp 0.45s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

.animate-scale-in {
  animation: scaleIn 0.5s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

.animate-spin {
  animation: spin 0.8s linear infinite;
}

/* Stagger delays */
.delay-100 { animation-delay: 0.1s; opacity: 0; }
.delay-200 { animation-delay: 0.2s; opacity: 0; }
.delay-300 { animation-delay: 0.3s; opacity: 0; }
.delay-400 { animation-delay: 0.4s; opacity: 0; }
.delay-500 { animation-delay: 0.5s; opacity: 0; }

/* ── Loading Spinner ── */
.spinner {
  width: 22px;
  height: 22px;
  border: 2.5px solid rgba(255, 255, 255, 0.25);
  border-top-color: #ffffff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  display: inline-block;
}

.spinner-dark {
  border-color: rgba(66, 133, 244, 0.2);
  border-top-color: var(--gdg-blue);
}

/* ── GDG Branding Dots ── */
.gdg-dots {
  display: flex;
  gap: 7px;
  align-items: center;
}

.gdg-dots span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
  transition: transform 0.3s ease;
}

.gdg-dots:hover span {
  transform: scale(1.2);
}

.gdg-dots span:nth-child(1) { background: var(--gdg-blue); }
.gdg-dots span:nth-child(2) { background: var(--gdg-red); }
.gdg-dots span:nth-child(3) { background: var(--gdg-yellow); }
.gdg-dots span:nth-child(4) { background: var(--gdg-green); }

/* ── GDG Rainbow Divider ── */
.gdg-divider {
  height: 3px;
  background: linear-gradient(90deg,
    var(--gdg-blue) 0%, var(--gdg-blue) 25%,
    var(--gdg-red) 25%, var(--gdg-red) 50%,
    var(--gdg-yellow) 50%, var(--gdg-yellow) 75%,
    var(--gdg-green) 75%, var(--gdg-green) 100%
  );
  border-radius: 2px;
}

/* ── Input Styles ── */
.input-field {
  width: 100%;
  padding: 12px 16px;
  border: 1.5px solid var(--gdg-border);
  border-radius: 10px;
  font-size: 0.938rem;
  font-family: 'Inter', sans-serif;
  transition: all 0.25s ease;
  background: rgba(255, 255, 255, 0.7);
  color: var(--gdg-dark);
}

.input-field::placeholder {
  color: var(--gdg-text-secondary);
  font-weight: 400;
}

.input-field:focus {
  outline: none;
  border-color: var(--gdg-blue);
  box-shadow: 0 0 0 3.5px rgba(66, 133, 244, 0.18);
  background: rgba(255, 255, 255, 0.95);
}

.input-field:hover:not(:focus) {
  border-color: #B0B8C1;
}

/* Dark input variant */
.input-field-dark {
  background: rgba(45, 46, 48, 0.8);
  color: #E8EAED;
  border-color: #3C4043;
}

.input-field-dark::placeholder {
  color: #9AA0A6;
}

.input-field-dark:focus {
  border-color: var(--gdg-blue);
  box-shadow: 0 0 0 3.5px rgba(66, 133, 244, 0.25);
  background: rgba(45, 46, 48, 1);
}

.input-field-dark:hover:not(:focus) {
  border-color: #5F6368;
}

/* ── Button Styles ── */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  background: linear-gradient(135deg, #4285F4 0%, #3367D6 100%);
  color: white;
  border: none;
  border-radius: 10px;
  font-size: 0.938rem;
  font-weight: 600;
  font-family: 'Inter', sans-serif;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.22, 1, 0.36, 1);
  position: relative;
  overflow: hidden;
}

.btn-primary::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg,
    transparent,
    rgba(255, 255, 255, 0.15),
    transparent
  );
  transition: left 0.5s ease;
}

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

.btn-primary:hover {
  background: linear-gradient(135deg, #3367D6 0%, #2A56B0 100%);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(66, 133, 244, 0.4);
}

.btn-primary:active {
  transform: translateY(0);
  box-shadow: 0 2px 8px rgba(66, 133, 244, 0.3);
}

.btn-primary:disabled {
  opacity: 0.65;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.btn-primary:disabled::before {
  display: none;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  background: transparent;
  color: var(--gdg-text-secondary);
  border: 1.5px solid var(--gdg-border);
  border-radius: 10px;
  font-size: 0.875rem;
  font-weight: 500;
  font-family: 'Inter', sans-serif;
  cursor: pointer;
  transition: all 0.25s ease;
}

.btn-secondary:hover {
  background: rgba(0, 0, 0, 0.04);
  border-color: var(--gdg-text-secondary);
  color: var(--gdg-dark);
}

.btn-success {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 32px;
  background: linear-gradient(135deg, #34A853 0%, #2D8E47 100%);
  color: white;
  border: none;
  border-radius: 12px;
  font-size: 1rem;
  font-weight: 600;
  font-family: 'Inter', sans-serif;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.22, 1, 0.36, 1);
  position: relative;
  overflow: hidden;
}

.btn-success::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg,
    transparent,
    rgba(255, 255, 255, 0.15),
    transparent
  );
  transition: left 0.5s ease;
}

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

.btn-success:hover {
  background: linear-gradient(135deg, #2D8E47 0%, #24753B 100%);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(52, 168, 83, 0.4);
}

.btn-success:active {
  transform: translateY(0);
}

.btn-success:disabled {
  opacity: 0.65;
  cursor: not-allowed;
  transform: none;
}

/* ── Error Message ── */
.error-message {
  background: rgba(234, 67, 53, 0.08);
  border: 1px solid rgba(234, 67, 53, 0.2);
  color: #C5221F;
  padding: 10px 16px;
  border-radius: 10px;
  font-size: 0.875rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 8px;
}

.error-message-dark {
  background: rgba(234, 67, 53, 0.12);
  border-color: rgba(234, 67, 53, 0.3);
  color: #F28B82;
}

/* ── Progress Bar ── */
.progress-bar-track {
  height: 8px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 4px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--gdg-blue), var(--gdg-green));
  border-radius: 4px;
  transition: width 0.5s cubic-bezier(0.22, 1, 0.36, 1);
  position: relative;
}

.progress-bar-fill::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg,
    transparent,
    rgba(255, 255, 255, 0.3),
    transparent
  );
  animation: shimmer 2s infinite;
  background-size: 200% 100%;
}

/* ── Status Log ── */
.log-entry {
  animation: slideUp 0.3s ease-out forwards;
}

.status-log {
  max-height: 300px;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: rgba(255, 255, 255, 0.15) transparent;
}

.status-log::-webkit-scrollbar {
  width: 5px;
}

.status-log::-webkit-scrollbar-track {
  background: transparent;
}

.status-log::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.15);
  border-radius: 3px;
}

/* ── File Upload Zone ── */
.upload-zone {
  border: 2px dashed rgba(255, 255, 255, 0.15);
  border-radius: 12px;
  padding: 24px;
  text-align: center;
  cursor: pointer;
  transition: all 0.3s ease;
  background: rgba(255, 255, 255, 0.03);
}

.upload-zone:hover {
  border-color: var(--gdg-blue);
  background: rgba(66, 133, 244, 0.05);
}

.upload-zone.drag-over {
  border-color: var(--gdg-blue);
  background: rgba(66, 133, 244, 0.1);
  transform: scale(1.01);
}

/* ── Certificate Frame ── */
.certificate-frame {
  position: relative;
  border-radius: 16px;
  padding: 4px;
  background: linear-gradient(135deg,
    var(--gdg-blue),
    var(--gdg-red),
    var(--gdg-yellow),
    var(--gdg-green)
  );
  background-size: 300% 300%;
  animation: gradientShift 8s ease infinite;
}

.certificate-frame img {
  border-radius: 12px;
  width: 100%;
  display: block;
  max-height: 500px;
  object-fit: contain;
  background: white;
}

/* ── Custom Scrollbar (Global) ── */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: rgba(0, 0, 0, 0.15);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(0, 0, 0, 0.25);
}

/* ── View Transitions ── */
.view-transition {
  transition: opacity 0.4s ease, transform 0.4s cubic-bezier(0.22, 1, 0.36, 1);
}

.view-hidden {
  opacity: 0;
  transform: translateY(20px);
  pointer-events: none;
  position: absolute;
  width: 100%;
}

.view-visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

/* ── Success Badge ── */
.success-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background: rgba(52, 168, 83, 0.1);
  color: var(--gdg-green);
  border-radius: 20px;
  font-size: 0.813rem;
  font-weight: 600;
  border: 1px solid rgba(52, 168, 83, 0.2);
}

/* ── Event Badge ── */
.event-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 16px;
  background: linear-gradient(135deg, rgba(66, 133, 244, 0.1), rgba(52, 168, 83, 0.1));
  color: var(--gdg-blue);
  border-radius: 20px;
  font-size: 0.813rem;
  font-weight: 600;
  border: 1px solid rgba(66, 133, 244, 0.15);
}

/* ── Confetti Animation ── */
.confetti-piece {
  position: fixed;
  width: 10px;
  height: 10px;
  top: -10px;
  opacity: 0;
  z-index: 100;
  animation: confetti-fall 3s ease-in forwards;
}

/* ── Responsive helpers ── */
@media (max-width: 640px) {
  .orb {
    display: none;
  }

  .certificate-frame img {
    max-height: 300px;
  }
}

/* ── Admin Dark Theme ── */
.admin-dark {
  background: #0F0F10;
  min-height: 100vh;
}

.admin-dark .glass-card-dark {
  background: rgba(26, 27, 30, 0.9);
}

/* ── Tooltip ── */
.tooltip {
  position: relative;
}

.tooltip::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(-4px);
  padding: 6px 12px;
  background: var(--gdg-dark);
  color: white;
  font-size: 0.75rem;
  border-radius: 6px;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}

.tooltip:hover::after {
  opacity: 1;
}

/* ── Shimmer Loading Skeleton ── */
.skeleton {
  background: linear-gradient(90deg,
    rgba(0, 0, 0, 0.06) 0%,
    rgba(0, 0, 0, 0.1) 50%,
    rgba(0, 0, 0, 0.06) 100%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: 8px;
}