/*
 * SEHS4517 Web Application Development and Management
 * Scenario 2: Tech Innovation Lab Equipment Rental Portal
 * Full Name:  Yau Tsz Hin
 * Student ID: 25132480S
 */

/* ── Design Tokens ── */
:root {
  --bg-primary:    #0a1628;
  --bg-secondary:  #112240;
  --bg-card:       #1a2f4e;
  --accent:        #00d4ff;
  --accent-2:      #00ff9d;
  --text:          #ccd6f6;
  --text-light:    #ffffff;
  --text-muted:    #8892b0;
  --border:        #233554;
  --input-bg:      #0d1b2e;
  --error:         #ff6b6b;
  --shadow:        0 4px 24px rgba(0, 0, 0, 0.4);
}

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

html { scroll-behavior: smooth; font-size: 16px; }

body {
  background-color: var(--bg-primary);
  color: var(--text);
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  line-height: 1.7;
  min-height: 100vh;
}

/* ── Sticky Header / Nav ── */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 22, 40, 0.96);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  padding: 0 2rem;
}

.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
}
.nav-logo svg { width: 36px; height: 36px; }
.nav-logo span {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-light);
  letter-spacing: 0.02em;
}
.nav-logo span em { color: var(--accent); font-style: normal; }

.nav-links { display: flex; gap: 0.25rem; align-items: center; }

nav a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  padding: 0.4rem 0.75rem;
  border-radius: 4px;
  transition: color 0.2s, background 0.2s;
}
nav a:hover { color: var(--accent); background: rgba(0, 212, 255, 0.08); }

.nav-cta {
  background: var(--accent) !important;
  color: var(--bg-primary) !important;
  font-weight: 700 !important;
  padding: 0.4rem 1.1rem !important;
}
.nav-cta:hover { background: #00b8d9 !important; }

/* ── Page Layout ── */
main { max-width: 1100px; margin: 0 auto; padding: 0 2rem 4rem; }

/* ── Hero ── */
#hero { text-align: center; padding: 5rem 1rem 3rem; }

.hero-badge {
  display: inline-block;
  background: rgba(0, 212, 255, 0.1);
  border: 1px solid var(--accent);
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 0.3rem 1rem;
  border-radius: 100px;
  margin-bottom: 1.5rem;
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  color: var(--text-light);
  line-height: 1.15;
  margin-bottom: 1.25rem;
}
.hero-title span { color: var(--accent); }

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 680px;
  margin: 0 auto 2rem;
}

.hero-actions { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1.6rem;
  border-radius: 6px;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all 0.2s;
  font-family: inherit;
}

.btn-primary  { background: var(--accent);  color: var(--bg-primary); border-color: var(--accent); }
.btn-primary:hover  { background: #00b8d9; border-color: #00b8d9; }

.btn-outline  { background: transparent; color: var(--accent); border-color: var(--accent); }
.btn-outline:hover  { background: rgba(0, 212, 255, 0.1); }

.btn-secondary { background: var(--bg-card); color: var(--text); border-color: var(--border); }
.btn-secondary:hover { border-color: var(--accent); color: var(--accent); }

.btn-success  { background: var(--accent-2); color: var(--bg-primary); border-color: var(--accent-2); }
.btn-success:hover  { background: #00d98a; }

/* ── Section Layout ── */
.section { margin-top: 4rem; scroll-margin-top: 80px; }

.section-label {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.5rem;
}
.section-title {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 700;
  color: var(--text-light);
  margin-bottom: 1rem;
}
.section-desc { color: var(--text-muted); max-width: 640px; margin-bottom: 2rem; }

/* ── Card Grid ── */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.5rem;
  transition: border-color 0.2s, transform 0.2s;
}
.card:hover { border-color: var(--accent); transform: translateY(-2px); }

.card-icon {
  width: 48px; height: 48px;
  border-radius: 10px;
  background: rgba(0, 212, 255, 0.12);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 1rem;
}
.card h3 { color: var(--text-light); font-size: 1rem; font-weight: 600; margin-bottom: 0.5rem; }
.card p  { color: var(--text-muted); font-size: 0.9rem; }

/* ── Policy Boxes ── */
.policy-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.25rem;
}
.policy-box {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: 8px;
  padding: 1.25rem 1.5rem;
}
.policy-box h4 { color: var(--text-light); font-size: 0.95rem; font-weight: 600; margin-bottom: 0.4rem; }
.policy-box p  { color: var(--text-muted); font-size: 0.875rem; }

/* ── Reservation Form ── */
#reserve { scroll-margin-top: 80px; }

.form-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2.5rem;
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem 1.75rem;
}

.form-group         { display: flex; flex-direction: column; gap: 0.4rem; }
.form-group.full-w  { grid-column: 1 / -1; }

label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text);
}
label .req { color: var(--accent); margin-left: 2px; }

input[type="text"],
input[type="date"],
input[type="time"],
input[type="tel"],
input[type="email"],
input[type="password"],
select,
textarea {
  background: var(--input-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-size: 0.95rem;
  font-family: inherit;
  padding: 0.6rem 0.9rem;
  width: 100%;
  transition: border-color 0.2s, box-shadow 0.2s;
  -webkit-appearance: none;
  appearance: none;
}
input[type="text"]:focus,
input[type="date"]:focus,
input[type="time"]:focus,
input[type="tel"]:focus,
input[type="email"]:focus,
input[type="password"]:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.12);
}

select {
  cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%238892b0' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  padding-right: 2.5rem;
}

textarea { resize: vertical; min-height: 90px; }

.radio-group { display: flex; gap: 1.25rem; flex-wrap: wrap; padding: 0.4rem 0; }

.radio-option {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  cursor: pointer;
  font-size: 0.95rem;
  color: var(--text);
}
.radio-option input[type="radio"] {
  width: 17px; height: 17px;
  accent-color: var(--accent);
  cursor: pointer;
}

.form-hint {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 0.15rem;
}

.form-actions {
  display: flex;
  gap: 1rem;
  justify-content: flex-end;
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

/* ── Review Table ── */
.review-table { width: 100%; border-collapse: collapse; margin: 1.5rem 0; }
.review-table th,
.review-table td {
  text-align: left;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border);
  font-size: 0.9rem;
}
.review-table th {
  color: var(--text-muted);
  font-weight: 600;
  width: 230px;
  background: var(--bg-secondary);
}
.review-table td { color: var(--text-light); }

/* ── Page Header (review / result pages) ── */
.page-header {
  padding: 2.5rem 0 1.5rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 2rem;
}
.page-header h1 { color: var(--text-light); font-size: 1.75rem; font-weight: 700; margin-bottom: 0.5rem; }
.page-header p  { color: var(--text-muted); }

.page-content { max-width: 860px; margin: 0 auto; padding: 0 0 4rem; }

.page-actions {
  display: flex;
  gap: 1rem;
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

/* ── Result Pages (thank-you / sorry) ── */
.result-wrapper {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - 140px);
  padding: 2rem;
}

.result-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 3rem 2.5rem;
  max-width: 560px;
  width: 100%;
  text-align: center;
}
.result-icon { font-size: 3.5rem; margin-bottom: 1.25rem; line-height: 1; }
.result-card h1 { color: var(--text-light); font-size: 1.75rem; font-weight: 700; margin-bottom: 1rem; }
.result-card p  { color: var(--text-muted); font-size: 1rem; margin-bottom: 1.5rem; line-height: 1.7; }

.result-card.success { border-color: var(--accent-2); }
.result-card.error   { border-color: var(--error); }

/* ── Divider ── */
.divider { border: none; border-top: 1px solid var(--border); margin: 2.5rem 0; }

/* ── Footer ── */
footer {
  border-top: 1px solid var(--border);
  text-align: center;
  padding: 2rem;
  color: var(--text-muted);
  font-size: 0.875rem;
  margin-top: 4rem;
}
footer a { color: var(--accent); text-decoration: none; }

/* ── Responsive ── */
@media (max-width: 768px) {
  .form-grid { grid-template-columns: 1fr; }
  .form-group.full-w { grid-column: 1; }
  .nav-links { display: none; }
  .form-actions, .page-actions { flex-direction: column; }
  .btn { width: 100%; justify-content: center; }
}