@import url('fonts.css');
:root {
  --font-family: 'Plus Jakarta Sans', sans-serif;
  --bg-dark: #0d0f17;
  --bg-card: #161a29;
  --bg-card-hover: #1e2438;
  --text-main: #f8fafc;
  --text-sub: #94a3b8;
  --primary-color: #f97316;
  --primary-hover: #ea580c;
  --accent-color: #38bdf8;
  --border-color: rgba(255, 255, 255, 0.12);
  --placeholder-bg: rgba(249, 115, 22, 0.08);
  --placeholder-border: rgba(249, 115, 22, 0.35);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.6;
}

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

.container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.text-center {
  text-align: center;
}

/* Wireframe Visual Placeholder */
.wireframe-image-placeholder {
  width: 100%;
  height: 100%;
  min-height: 160px;
  background: var(--placeholder-bg);
  border: 2px dashed var(--placeholder-border);
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--primary-color);
  gap: 0.5rem;
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  padding: 1rem;
  text-align: center;
}

.wireframe-image-placeholder i {
  font-size: 2.2rem;
  opacity: 0.9;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 1.4rem;
  border-radius: var(--radius-sm);
  font-weight: 800;
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  cursor: pointer;
  border: none;
  transition: all 0.25s ease;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-color), #ef4444);
  color: #fff;
  box-shadow: 0 4px 15px rgba(249, 115, 22, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(249, 115, 22, 0.6);
}

.btn-outline {
  border: 1px solid var(--border-color);
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.05);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.15);
}

.btn-lg {
  padding: 0.9rem 1.8rem;
  font-size: 0.95rem;
}

/* Header */
.header {
  background: rgba(22, 26, 41, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
  padding: 1rem 0;
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: 0.06em;
}

.logo-badge {
  width: 38px;
  height: 38px;
  background: var(--primary-color);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
}

/* Hero */
.hero-section {
  position: relative;
  padding: 5rem 0;
  background: linear-gradient(180deg, #131724 0%, var(--bg-dark) 100%);
  border-bottom: 1px solid var(--border-color);
  overflow: hidden;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 800px;
}

.event-date-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(249, 115, 22, 0.15);
  color: var(--primary-color);
  border: 1px solid rgba(249, 115, 22, 0.3);
  padding: 0.4rem 1.1rem;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  margin-bottom: 1.5rem;
}

.event-title {
  font-size: 3rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 1.25rem;
}

.event-subtitle {
  color: var(--text-sub);
  font-size: 1.1rem;
  margin-bottom: 2rem;
}

.hero-cta {
  display: flex;
  justify-content: center;
  gap: 1.25rem;
}

.hero-placeholder-watermark {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 90%;
  height: 80%;
  opacity: 0.12;
  pointer-events: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
  border: 3px dashed var(--primary-color);
  border-radius: var(--radius-lg);
}

/* Quick Info Bar */
.quick-info-bar {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  padding: 1.5rem 0;
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.info-card {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.info-icon {
  width: 48px;
  height: 48px;
  background: rgba(249, 115, 22, 0.15);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary-color);
  font-size: 1.4rem;
}

.info-label {
  display: block;
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--text-sub);
}

.info-val {
  font-size: 0.95rem;
  font-weight: 700;
}

.countdown-timer {
  font-size: 1rem;
  font-weight: 800;
  color: var(--primary-color);
  letter-spacing: 0.05em;
  font-family: monospace;
}

/* Section Title */
.section-title {
  font-size: 1.8rem;
  font-weight: 800;
  letter-spacing: 0.05em;
}

.accent-line {
  width: 50px;
  height: 3px;
  background: var(--primary-color);
  margin: 0.75rem 0 1.5rem 0;
  border-radius: 2px;
}

.accent-line.center {
  margin: 0.75rem auto 2.5rem auto;
}

/* About Section */
.about-section {
  padding: 4.5rem 0;
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.about-text p {
  color: var(--text-sub);
  margin-bottom: 1rem;
  font-size: 1rem;
}

.media-placeholder {
  min-height: 260px;
  box-shadow: var(--shadow);
}

/* Speakers */
.speakers-section {
  padding: 4.5rem 0;
  background: var(--bg-card);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.speakers-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

.speaker-card {
  background: var(--bg-dark);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 1.5rem;
  align-items: center;
  transition: border-color 0.25s ease;
}

.speaker-card:hover {
  border-color: var(--primary-color);
}

.speaker-thumb {
  height: 140px;
}

.speaker-name {
  font-size: 1.25rem;
  font-weight: 800;
  margin-bottom: 0.25rem;
}

.speaker-role {
  display: block;
  font-size: 0.85rem;
  color: var(--primary-color);
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.presentation-title {
  font-size: 0.85rem;
  color: var(--text-sub);
}

/* Schedule */
.schedule-section {
  padding: 4.5rem 0;
}

.schedule-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2.5rem;
}

.day-heading {
  font-size: 1.1rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  color: var(--accent-color);
  margin-bottom: 1.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-color);
}

.schedule-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 1rem 1.25rem;
  margin-bottom: 1rem;
  display: flex;
  gap: 1.25rem;
  align-items: center;
}

.time-badge {
  background: rgba(56, 189, 248, 0.15);
  color: var(--accent-color);
  font-size: 0.75rem;
  font-weight: 800;
  padding: 0.35rem 0.75rem;
  border-radius: 4px;
  white-space: nowrap;
}

.item-info h4 {
  font-size: 0.95rem;
  font-weight: 700;
}

.item-info p {
  font-size: 0.8rem;
  color: var(--text-sub);
}

/* Sponsors */
.sponsors-section {
  padding: 4rem 0;
  background: var(--bg-card);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.sponsors-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

.sponsor-placeholder {
  min-height: 140px;
}

/* Venue */
.venue-section {
  padding: 4.5rem 0;
}

.venue-placeholder {
  min-height: 320px;
}

/* Registration Banner */
.register-section {
  padding: 4.5rem 0;
  background: linear-gradient(135deg, rgba(249, 115, 22, 0.2), rgba(239, 68, 68, 0.2));
  border-top: 1px solid var(--border-color);
}

.register-section h2 {
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
}

.register-section p {
  color: var(--text-sub);
  margin-bottom: 2rem;
}

.register-form {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  max-width: 550px;
  margin: 0 auto;
}

.reg-input {
  flex-grow: 1;
  padding: 0.85rem 1.25rem;
  border-radius: var(--radius-sm);
  background: var(--bg-dark);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  font-family: inherit;
}

.reg-input:focus {
  outline: none;
  border-color: var(--primary-color);
}

.reg-success {
  margin-top: 1rem;
  color: #4ade80;
  font-weight: 700;
}

.reg-success.hidden {
  display: none;
}

/* Footer */
.footer {
  background: #07080d;
  padding: 2rem 0;
  text-align: center;
  color: var(--text-sub);
  font-size: 0.85rem;
  border-top: 1px solid var(--border-color);
}

/* Responsive */
@media (max-width: 900px) {
  .info-grid {
    grid-template-columns: 1fr;
  }
  .about-grid, .speakers-grid, .schedule-grid, .sponsors-grid {
    grid-template-columns: 1fr;
  }
  .speaker-card {
    grid-template-columns: 1fr;
  }
  .event-title {
    font-size: 2.2rem;
  }
  .register-form {
    flex-direction: column;
  }
}

/* Global Mobile Viewport Overflow Protection */
html, body {
  overflow-x: hidden;
  max-width: 100%;
}
img, svg, video, iframe, canvas {
  max-width: 100%;
  height: auto;
}