/* ========================================
   iLink Auth Pages — login / register
   ======================================== */

.auth-page--login,
.auth-page--register {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  background:
    var(--bg-mesh),
    linear-gradient(165deg, #fdf9f3 0%, #faf9f7 50%, #fdf9f3 100%);
}

.auth-page--login html,
.auth-page--register html {
  height: 100%;
  overflow: hidden;
}

/* Floating shapes */
.floating-shapes {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.floating-shapes .shape {
  position: absolute;
  background: var(--glass-bg-light);
  backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
  opacity: 0.55;
  animation: ilink-auth-float linear infinite;
}

.shape--1 { width: 200px; height: 200px; border-radius: var(--radius-xl); left: 8%; bottom: -200px; animation-duration: 18s; }
.shape--2 { width: 120px; height: 120px; border-radius: var(--radius-lg); left: 30%; bottom: -120px; animation-duration: 22s; animation-delay: 4s; }
.shape--3 { width: 160px; height: 160px; border-radius: var(--radius-xl); right: 10%; bottom: -160px; animation-duration: 20s; animation-delay: 2s; }
.shape--4 { width: 100px; height: 100px; border-radius: var(--radius-full); right: 35%; bottom: -100px; animation-duration: 16s; animation-delay: 6s; }
.shape--5 { width: 140px; height: 140px; border-radius: var(--radius-lg); left: 55%; bottom: -140px; animation-duration: 24s; animation-delay: 8s; }

@keyframes ilink-auth-float {
  0% { transform: translateY(0) rotate(0deg); opacity: 0; }
  10% { opacity: 0.55; }
  90% { opacity: 0.55; }
  100% { transform: translateY(-120vh) rotate(360deg); opacity: 0; }
}

.auth-wrapper {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: calc(440px + 2 * var(--space-4));
  padding: var(--space-4);
  box-sizing: border-box;
}

.auth-card {
  background: var(--glass-bg-strong);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border-strong);
  border-radius: var(--radius-2xl);
  box-shadow: var(--glass-shadow), var(--shadow-xl);
  padding: var(--space-6) var(--space-5);
  animation: ilink-auth-card-in 0.55s cubic-bezier(0.34, 1.2, 0.64, 1) both;
  position: relative;
  display: flow-root;
  box-sizing: border-box;
  width: 100%;
  max-width: 420px;
  margin-inline: auto;
  overflow: visible;
}

.auth-card::before,
.auth-card::after {
  content: none;
  display: none;
}

@keyframes ilink-auth-card-in {
  0% { opacity: 0; transform: translateY(24px) scale(0.97); }
  100% { opacity: 1; transform: translateY(0) scale(1); }
}

.brand-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-6);
}

.brand-logo__icon {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  background: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
  font-family: var(--font-display);
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  letter-spacing: -0.04em;
  box-shadow: var(--shadow-md);
}

.auth-card__header {
  text-align: center;
  margin-bottom: var(--space-8);
}

.auth-card__title {
  font-family: var(--font-display);
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}

.auth-card__subtitle {
  font-size: var(--font-size-sm);
  color: var(--text-tertiary);
}

.auth-card form,
.auth-card #loginForm,
.auth-card #registerForm,
.auth-card .form-group,
.auth-card .input-wrapper {
  width: 100%;
  max-width: 100%;
  min-width: 0;
  box-sizing: border-box;
}

.auth-card .form-group {
  margin-bottom: var(--space-4);
}

.auth-card .form-group label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--text-secondary);
  margin-bottom: var(--space-2);
}

.auth-card .input-wrapper {
  position: relative;
  display: block;
}

.auth-card .input-wrapper input,
.auth-card #identifier,
.auth-card #password,
.auth-card #phone,
.auth-card #studentId,
.auth-card #confirmPassword {
  display: block;
  width: 100% !important;
  max-width: 100% !important;
  min-width: 0 !important;
  box-sizing: border-box !important;
  padding: 14px 16px;
  font-size: var(--font-size-base);
  font-family: var(--font-family);
  color: var(--text-primary);
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.auth-card .input-wrapper:has(.toggle-password) input {
  padding-right: 44px;
}

.auth-card .input-wrapper input::placeholder {
  color: var(--text-tertiary);
}

.auth-card .input-wrapper input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--brand-ring);
}

.auth-card .input-wrapper input.il-input-invalid {
  border-color: var(--color-danger);
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.12);
}

.auth-card .toggle-password {
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 1;
  width: auto;
  min-width: 0;
  flex: none;
  background: none;
  border: none;
  color: var(--text-tertiary);
  cursor: pointer;
  padding: 6px;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background var(--transition-fast);
}

.auth-card .toggle-password:hover {
  color: var(--text-secondary);
  background: var(--bg-muted);
}

.auth-card .toggle-password svg {
  width: 20px;
  height: 20px;
}

.auth-card .error-message {
  font-size: var(--font-size-xs);
  color: var(--color-danger);
  margin-top: var(--space-1);
  display: none;
}

.auth-card .error-message.visible,
.auth-card .error-message.is-visible {
  display: block;
}

.auth-card .form-options {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-6);
  flex-wrap: wrap;
  gap: var(--space-2);
}

.auth-card .checkbox-wrapper {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  cursor: pointer;
}

.auth-card .checkbox-wrapper input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--primary);
  cursor: pointer;
}

.auth-card .checkbox-wrapper span {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

.auth-card .btn-submit {
  display: block;
  width: 100%;
  max-width: 100%;
  box-sizing: border-box;
  padding: 14px;
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  font-family: var(--font-family);
  color: var(--color-white);
  background: var(--primary);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), opacity var(--transition-fast);
}

.auth-card .btn-submit:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.auth-card .btn-submit:active {
  transform: translateY(0);
}

.auth-card .btn-submit:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  transform: none;
}

.auth-card .alert {
  margin-top: var(--space-4);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  display: none;
}

.auth-card .alert.visible {
  display: block;
}

.auth-card .alert-danger {
  background: var(--toast-error-bg);
  color: var(--toast-error-text);
  border: 1px solid var(--toast-error-border);
}

.auth-card .alert-success {
  background: var(--toast-success-bg);
  color: var(--toast-success-text);
  border: 1px solid var(--toast-success-border);
}

.auth-card__footer {
  text-align: center;
  margin-top: var(--space-5);
  font-size: var(--font-size-sm);
  color: var(--text-tertiary);
}

/* Register-only */
.identifier-toggle,
.register-tabs {
  display: flex;
  width: 100%;
  max-width: 100%;
  min-width: 0;
  box-sizing: border-box;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}

.identifier-toggle__btn,
.register-tabs__btn {
  flex: 1 1 0;
  min-width: 0;
  padding: 10px;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  font-family: var(--font-family);
  color: var(--text-secondary);
  background: var(--bg-muted);
  border: 1.5px solid var(--border-light);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: color var(--transition-fast), background var(--transition-fast),
              border-color var(--transition-fast), box-shadow var(--transition-fast),
              transform var(--transition-fast);
}

.identifier-toggle__btn:hover,
.register-tabs__btn:hover {
  color: var(--text-primary);
  background: var(--bg-surface);
  border-color: var(--border-default);
}

/* 选中态：黑白灰体系 —— 深色填充 + 白色文字 + 微阴影，高对比度 */
.identifier-toggle__btn.active {
  color: var(--color-white, #FFFFFF);
  background: var(--text-primary, #111827);
  border-color: var(--text-primary, #111827);
  font-weight: var(--font-weight-semibold);
  box-shadow: var(--shadow-sm);
}

.identifier-toggle__btn.active:hover {
  background: var(--primary-dark, #030712);
  border-color: var(--primary-dark, #030712);
}

.agreement-wrapper {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  line-height: 1.5;
}

.agreement-wrapper input {
  margin-top: 3px;
  accent-color: var(--primary);
}

/* === 紧凑布局：缩短卡片高度 === */
/* 登录页 + 注册页共用：收紧纵向间距，保持可读性 */

/* ── 登录页紧凑 ── */
.auth-page--login .brand-logo {
  margin-bottom: var(--space-4);        /* 24 → 16 */
}

.auth-page--login .brand-logo__icon {
  width: 44px;                          /* 56 → 44 */
  height: 44px;
  border-radius: 13px;
  font-size: var(--font-size-xl);
}

.auth-page--login .auth-card__header {
  margin-bottom: var(--space-4);        /* 32 → 16 */
}

.auth-page--login .auth-card .form-group {
  margin-bottom: var(--space-3);        /* 16 → 12 */
}

.auth-page--login .auth-card .input-wrapper input,
.auth-page--login .auth-card #identifier,
.auth-page--login .auth-card #password {
  padding-top: 11px;                    /* 14 → 11 */
  padding-bottom: 11px;
}

.auth-page--login .auth-card .form-options {
  margin-bottom: var(--space-4);        /* 24 → 16 */
}

.auth-page--login .auth-card .btn-submit {
  padding-top: 11px;                    /* 14 → 11 */
  padding-bottom: 11px;
}

.auth-page--login .auth-card__footer {
  margin-top: var(--space-3);           /* 20 → 12 */
}

/* ── 注册页紧凑 ── */
.auth-page--register .brand-logo {
  margin-bottom: var(--space-3);        /* 24 → 12 */
}

.auth-page--register .brand-logo__icon {
  width: 44px;                          /* 56 → 44 */
  height: 44px;
  border-radius: 13px;
  font-size: var(--font-size-lg);
}

.auth-page--register .auth-card__header {
  margin-bottom: var(--space-3);        /* 32 → 12 */
}

.auth-page--register .auth-card .form-group {
  margin-bottom: var(--space-2);        /* 16 → 8 */
}

.auth-page--register .identifier-toggle {
  margin-bottom: var(--space-1);        /* 12 → 4 */
}

.auth-page--register .agreement-wrapper {
  margin-bottom: var(--space-2);        /* 16 → 8 */
}

.auth-page--register .auth-card .input-wrapper input,
.auth-page--register .auth-card #phone,
.auth-page--register .auth-card #studentId,
.auth-page--register .auth-card #password,
.auth-page--register .auth-card #confirmPassword {
  padding-top: 10px;                    /* 14 → 10 */
  padding-bottom: 10px;
}

.auth-page--register .auth-card .btn-submit {
  padding-top: 11px;
  padding-bottom: 11px;
}

.auth-page--register .auth-card__footer {
  margin-top: var(--space-2);           /* 20 → 8 */
}

@media (max-width: 480px) {
  .auth-card {
    padding: var(--space-8) var(--space-5);
  }
  .auth-card__title {
    font-size: var(--font-size-xl);
  }
}

/* 移动端登录注册页：保证触摸面积与小屏滚动稳定 */
@media (max-width: 768px) {
  .auth-page--login,
  .auth-page--register {
    min-height: 100dvh;
    align-items: flex-start;
    justify-content: flex-start;
    overflow-x: hidden;
    overflow-y: auto;
    padding: 16px 0 28px;
  }

  .auth-wrapper {
    width: 100%;
    max-width: 100%;
    padding: 12px 16px;
  }

  .auth-card {
    max-width: 100%;
    padding: 28px 22px;
    border-radius: 18px;
  }

  .auth-card .input-wrapper input,
  .auth-card #identifier,
  .auth-card #password,
  .auth-card #phone,
  .auth-card #studentId,
  .auth-card #confirmPassword,
  .auth-card .btn-submit,
  .identifier-toggle__btn,
  .register-tabs__btn {
    min-height: 48px;
  }

  .auth-card .input-wrapper:has(.toggle-password) input {
    padding-right: 58px;
  }

  .auth-card .toggle-password {
    right: 4px;
    width: 44px;
    min-width: 44px;
    height: 44px;
    min-height: 44px;
    padding: 10px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .auth-card .checkbox-wrapper,
  .agreement-wrapper {
    min-height: 44px;
  }

  .auth-card .checkbox-wrapper input[type="checkbox"],
  .agreement-wrapper input {
    width: 22px;
    height: 22px;
    min-width: 22px;
    flex-shrink: 0;
  }

  .auth-card .checkbox-wrapper input[type="checkbox"] {
    margin: 0;
  }

  .agreement-wrapper input {
    margin-top: 1px;
  }

  .auth-card .form-options a,
  .auth-card__footer a,
  .agreement-wrapper a {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
  }
}

@media (max-width: 360px) {
  .auth-wrapper {
    padding-right: 12px;
    padding-left: 12px;
  }

  .auth-card {
    padding-right: 18px;
    padding-left: 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .auth-card,
  .floating-shapes .shape {
    animation: none !important;
  }
}