/* ── Variables ─────────────────────────────────────────────── */
:root {
  --bg:       #0a0a0a;
  --card:     #141414;
  --border:   #2a2a2a;
  --accent:   #e63946;
  --accent2:  #457b9d;
  --text:     #f1faee;
  --muted:    #8a9ba8;
  --radius:   12px;
  --font:     'Space Grotesk', system-ui, sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  min-height: 100vh;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── Nav ───────────────────────────────────────────────────── */
.top-nav {
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border);
}

.nav-logo {
  font-weight: 800;
  font-size: 1.1rem;
  letter-spacing: -0.02em;
  color: var(--text);
  text-decoration: none;
}

.nav-logo:hover { color: var(--accent); text-decoration: none; }

/* ── Flash messages ────────────────────────────────────────── */
.flash-container { padding: 0.75rem 1.5rem; }

.flash {
  padding: 0.75rem 1rem;
  border-radius: var(--radius);
  font-size: 0.9rem;
}

.flash--error   { background: rgba(230,57,70,.15); border: 1px solid var(--accent); }
.flash--success { background: rgba(69,123,157,.15); border: 1px solid var(--accent2); }

/* ── Card ──────────────────────────────────────────────────── */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
}

/* ── Buttons ───────────────────────────────────────────────── */
.btn-primary {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  font-family: var(--font);
  font-weight: 700;
  font-size: 1rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  transition: opacity .2s, transform .15s;
  text-decoration: none;
}

.btn-primary:hover { opacity: .88; transform: translateY(-1px); text-decoration: none; }

.btn-secondary {
  display: inline-block;
  background: transparent;
  color: var(--text);
  font-family: var(--font);
  font-weight: 600;
  font-size: 1rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  cursor: pointer;
  transition: border-color .2s, background .2s;
  text-decoration: none;
}

.btn-secondary:hover { border-color: var(--muted); background: rgba(255,255,255,.04); text-decoration: none; }

.btn-arrow { margin-left: 0.25rem; }

/* ── Hero (index page) ─────────────────────────────────────── */
.hero {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - 60px);
  padding: 2rem 1rem;
}

.hero__inner {
  max-width: 520px;
  width: 100%;
  text-align: center;
}

.hero__title {
  font-size: clamp(2.5rem, 8vw, 4.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1;
  margin-bottom: 0.5rem;
  background: linear-gradient(135deg, #fff 40%, var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__tagline {
  color: var(--muted);
  font-size: 1.1rem;
  margin-bottom: 2.5rem;
}

.hero__note {
  margin-top: 1.25rem;
  font-size: 0.82rem;
  color: var(--muted);
}

/* ── Form card ─────────────────────────────────────────────── */
.form-card { text-align: left; }

.form-card__heading {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: .06em;
  font-size: .78rem;
}

.form-row {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.form-group {
  flex: 1;
  min-width: 140px;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-bottom: 1rem;
}

.form-group label {
  font-size: 0.85rem;
  color: var(--muted);
  font-weight: 500;
}

.form-group input {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-family: var(--font);
  font-size: 0.95rem;
  padding: 0.6rem 0.75rem;
  width: 100%;
  transition: border-color .2s;
}

.form-group input:focus {
  outline: none;
  border-color: var(--accent2);
}

.form-card .btn-primary { width: 100%; text-align: center; margin-top: 0.5rem; }

.semester-range {
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 1.25rem;
}

/* ── Steps list (index page) ───────────────────────────────── */
.steps-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 0.25rem;
}

.step-item {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.step-num {
  flex-shrink: 0;
  width: 1.75rem;
  height: 1.75rem;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 0.15rem;
}

.step-body { flex: 1; }

.step-desc {
  font-size: 0.9rem;
  color: var(--text);
  margin-bottom: 0.5rem;
}

.step-hint {
  font-size: 0.8rem;
  color: var(--muted);
}

.step-hint code {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.1em 0.4em;
  font-size: 0.85em;
  word-break: break-all;
}

.btn-sm {
  font-size: 0.82rem !important;
  padding: 0.35rem 0.85rem !important;
}

/* ── Waiting page ──────────────────────────────────────────── */
.waiting-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - 60px);
  padding: 2rem 1rem;
}

.waiting-inner {
  max-width: 540px;
  width: 100%;
  text-align: center;
}

/* ── Plus-address instruction box ─────────────────────────── */
.plus-address-box {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  margin-bottom: 2rem;
  text-align: left;
}

.plus-address-label {
  font-size: .9rem;
  color: var(--muted);
  margin-bottom: .75rem;
}

.plus-address-row {
  display: flex;
  align-items: center;
  gap: .75rem;
  margin-bottom: .75rem;
}

.plus-address-code {
  flex: 1;
  font-size: .85rem;
  background: #1e1e1e;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: .5rem .75rem;
  color: var(--text);
  word-break: break-all;
}

.btn-copy {
  flex-shrink: 0;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 6px;
  padding: .5rem .9rem;
  font-size: .8rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity .2s;
}
.btn-copy:hover { opacity: .85; }

.plus-address-hint {
  font-size: .78rem;
  color: var(--muted);
  line-height: 1.5;
}

/* ── Email input ───────────────────────────────── */
.email-input {
  display: block;
  width: 100%;
  margin-top: .5rem;
  padding: .55rem .75rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 1rem;
  font-family: var(--font);
  outline: none;
  box-sizing: border-box;
  transition: border-color .2s;
}
.email-input:focus { border-color: var(--accent); }
.email-hint {
  margin-top: .4rem;
  font-size: .78rem;
  color: #e63946;
}
label.step-desc { display: block; }

/* ── Plus-address row wraps on narrow screens ── */
.plus-address-row { flex-wrap: wrap; }

/* ── Form card button full-width ───────────────── */
.form-card .btn-primary { width: 100%; text-align: center; }

/* ── Mobile tweaks ─────────────────────────────── */
@media (max-width: 480px) {
  .card { padding: 1.25rem; }
  .hero { padding: 1.25rem 0.75rem; }
  .hero__tagline { margin-bottom: 1.75rem; }
  .waiting-inner { padding: 0 0.5rem; }
}

/* Spinner */
.spinner {
  width: 52px;
  height: 52px;
  border: 4px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto 1.75rem;
}

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

/* Address box */
.address-box {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  margin-bottom: 1.5rem;
  text-align: left;
}

.address-box__lead {
  font-size: 0.9rem;
  color: var(--muted);
  margin-bottom: 0.75rem;
}

.address-box__addr-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.address-box__addr {
  font-family: monospace;
  font-size: 0.95rem;
  background: var(--bg);
  padding: 0.4rem 0.7rem;
  border-radius: 6px;
  border: 1px solid var(--border);
  word-break: break-all;
  flex: 1;
}

.btn-copy {
  background: var(--accent2);
  color: #fff;
  font-family: var(--font);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.4rem 0.9rem;
  border-radius: 6px;
  border: none;
  cursor: pointer;
  white-space: nowrap;
  transition: opacity .2s;
}

.btn-copy:hover { opacity: .85; }
.btn-copy.copied { background: #2a9d8f; }

.address-box__hint {
  font-size: 0.82rem;
  color: var(--muted);
  margin-top: 0.75rem;
}

/* Progress bar */
.waiting-status {
  color: var(--muted);
  font-size: 0.95rem;
  margin-bottom: 0.75rem;
  min-height: 1.5rem;
}

.progress-track {
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 0.5rem;
}

.progress-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 3px;
  transition: width 0.6s ease;
}

.waiting-step {
  font-size: 0.8rem;
  color: var(--muted);
  margin-bottom: 1.5rem;
}

/* Error box */
.error-box {
  background: rgba(230,57,70,.1);
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin-top: 1rem;
  text-align: left;
}

.error-box strong { display: block; margin-bottom: 0.5rem; }
.error-box p { color: var(--muted); font-size: 0.9rem; margin-bottom: 1rem; }