@import url('variables.css');

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

/* ===== Base ===== */
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: var(--lh-relaxed);  /* 1.8 CJK */
  font-size: var(--fs-md);        /* 18px */
}

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

/* ===== Layout ===== */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: var(--sp-10) var(--sp-6);  /* 40px 24px */
}

.container--narrow {
  max-width: 520px;
  margin: 0 auto;
  padding: var(--sp-10) var(--sp-6);
}

/* ===== Card ===== */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
}

.card__title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 8px;
}

.card__subtitle {
  font-size: 0.9rem;
  color: var(--text-dim);
  margin-bottom: 24px;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  min-height: var(--touch-target);   /* 56px */
  padding: 12px 24px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text);
  font-family: var(--font);
  font-size: var(--fs-md);          /* 18px */
  font-weight: 500;
  cursor: pointer;
  transition: background var(--duration-normal), border-color var(--duration-normal);
  white-space: nowrap;
  user-select: none;
}

.btn:hover {
  background: var(--surface-hover);
  border-color: var(--text-dim);
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #ffffff;
  font-weight: 600;
  width: 100%;
  padding: 12px 24px;
  font-size: 1rem;
}

.btn-primary:hover:not(:disabled) {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
}

.btn-ghost {
  border-color: transparent;
  color: var(--text-dim);
  font-size: 0.85rem;
  padding: 6px 12px;
}

.btn-ghost:hover {
  background: var(--surface-hover);
  color: var(--text);
  border-color: transparent;
}

/* ===== Form ===== */
.input-group {
  margin-bottom: 20px;
}

.input-group label {
  display: block;
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-bottom: 8px;
}

.input {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: var(--font);
  font-size: 0.95rem;
  transition: border-color 0.15s;
  outline: none;
}

.input:focus {
  border-color: var(--accent);
}

.input::placeholder {
  color: var(--text-dim);
}

.input:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

/* ===== OTP / 6-digit code ===== */
.otp-group {
  display: flex;
  gap: 10px;
  justify-content: center;
  margin-bottom: 20px;
}

.otp-input {
  width: 48px;
  height: 56px;
  text-align: center;
  font-size: 1.4rem;
  font-weight: 600;
  font-family: var(--font);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  outline: none;
  transition: border-color 0.15s;
  caret-color: var(--accent);
}

.otp-input:focus {
  border-color: var(--accent);
}

.otp-input.filled {
  border-color: var(--accent-dim);
}

/* ===== Alerts ===== */
.alert {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  margin-bottom: 16px;
  border: 1px solid transparent;
}

.alert-error {
  background: rgba(220, 38, 38, 0.08);
  border-color: rgba(220, 38, 38, 0.3);
  color: #b91c1c;
}

.alert-success {
  background: rgba(22, 163, 74, 0.08);
  border-color: rgba(22, 163, 74, 0.3);
  color: #15803d;
}

.alert-info {
  background: rgba(0, 85, 184, 0.06);
  border-color: rgba(0, 85, 184, 0.25);
  color: #004494;
}

/* ===== Loading Spinner ===== */
.loading-spinner {
  display: inline-block;
  width: 18px;
  height: 18px;
  border: 2px solid rgba(0, 85, 184, 0.2);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

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

/* ===== Header ===== */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  border-bottom: 1px solid var(--border);
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(8px);
}

.header__brand {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--accent);
}

.header__actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* ===== Footer ===== */
.footer {
  text-align: center;
  padding: 24px;
  font-size: 0.8rem;
  color: var(--text-dim);
  border-top: 1px solid var(--border);
  margin-top: auto;
}

.footer a {
  color: var(--text-dim);
}
.footer a:hover {
  color: var(--accent);
}

/* ===== Step / Fade transition ===== */
.step {
  display: none;
  animation: fadeIn 0.25s ease;
}

.step.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ===== Lang switcher ===== */
.lang-switcher {
  display: flex;
  gap: 4px;
}

.lang-btn {
  padding: 4px 8px;
  font-size: 0.78rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: transparent;
  color: var(--text-dim);
  cursor: pointer;
  font-family: var(--font);
  transition: all 0.15s;
}

.lang-btn.active,
.lang-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(0, 85, 184, 0.06);
}

/* ===== Countdown text ===== */
.countdown {
  font-size: 0.82rem;
  color: var(--text-dim);
  text-align: center;
  margin-top: 12px;
  min-height: 1.4em;
}

/* ===== Responsive ===== */
@media (max-width: 600px) {
  .container,
  .container--narrow {
    padding: 24px 16px;
  }

  .card {
    padding: 24px 20px;
  }

  .otp-input {
    width: 40px;
    height: 48px;
    font-size: 1.2rem;
  }

  .otp-group {
    gap: 7px;
  }
}