/* =============================================================
   Loan UI - 登錄 / 認證頁美化
   設計：雙欄佈局 + 玻璃擬態 + 漸層裝飾 + 現代化表單
   ============================================================= */

:root {
    --ui-auth-primary: #4f46e5;
    --ui-auth-primary-dark: #3730a3;
    --ui-auth-accent: #06b6d4;
    --ui-auth-bg-1: #eef2ff;
    --ui-auth-bg-2: #f0f9ff;
    --ui-auth-bg-3: #fdf4ff;
    --ui-auth-card-bg: rgba(255, 255, 255, 0.96);
    --ui-auth-text: #0f172a;
    --ui-auth-text-muted: #64748b;
    --ui-auth-border: rgba(15, 23, 42, 0.08);
    --ui-auth-shadow-lg: 0 30px 60px -20px rgba(15, 23, 42, 0.25);
    --ui-auth-shadow-md: 0 12px 30px -10px rgba(15, 23, 42, 0.18);
    --ui-auth-radius: 18px;
}

/* ---------- 整體頁面 ---------- */
html, body.auth-page, body.login-page, body.register-page {
    height: 100%;
    margin: 0;
    font-family: 'Inter', 'Source Sans Pro', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--ui-auth-text);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body.login-page,
body.register-page,
body.auth-page {
    background:
        radial-gradient(circle at 12% 18%, rgba(99, 102, 241, 0.18), transparent 45%),
        radial-gradient(circle at 88% 12%, rgba(6, 182, 212, 0.18), transparent 50%),
        radial-gradient(circle at 78% 92%, rgba(168, 85, 247, 0.16), transparent 55%),
        linear-gradient(135deg, var(--ui-auth-bg-1) 0%, var(--ui-auth-bg-2) 50%, var(--ui-auth-bg-3) 100%);
    min-height: 100vh;
    overflow-x: hidden;
}

/* 動態漂浮光斑 */
body.login-page::before,
body.register-page::before,
body.auth-page::before {
    content: '';
    position: fixed;
    top: -160px;
    right: -160px;
    width: 480px;
    height: 480px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(79, 70, 229, 0.22) 0%, transparent 70%);
    filter: blur(20px);
    pointer-events: none;
    z-index: 0;
    animation: ui-auth-float 18s ease-in-out infinite;
}
body.login-page::after,
body.register-page::after,
body.auth-page::after {
    content: '';
    position: fixed;
    bottom: -200px;
    left: -180px;
    width: 540px;
    height: 540px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(6, 182, 212, 0.20) 0%, transparent 70%);
    filter: blur(20px);
    pointer-events: none;
    z-index: 0;
    animation: ui-auth-float 22s ease-in-out -6s infinite;
}
@keyframes ui-auth-float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(40px, -30px) scale(1.05); }
}

/* ---------- 雙欄容器 ---------- */
.ui-auth-shell {
    position: relative;
    z-index: 1;
    display: flex;
    min-height: 100vh;
    align-items: center;
    justify-content: center;
    padding: 2rem 1.25rem;
}
.ui-auth-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    gap: 3rem;
    width: 100%;
    max-width: 1180px;
    align-items: stretch;
}
@media (max-width: 991.98px) {
    .ui-auth-grid { grid-template-columns: 1fr; max-width: 480px; gap: 1.5rem; }
}

/* ---------- Hero 區（左欄）---------- */
.ui-auth-hero {
    position: relative;
    padding: 3rem 2.5rem;
    color: var(--ui-auth-text);
    border-radius: var(--ui-auth-radius);
    background: linear-gradient(160deg, rgba(79, 70, 229, 0.95) 0%, rgba(6, 182, 212, 0.92) 50%, rgba(168, 85, 247, 0.92) 100%);
    box-shadow: var(--ui-auth-shadow-lg);
    overflow: hidden;
    color: #fff;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}
.ui-auth-hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 18% 18%, rgba(255, 255, 255, 0.30) 0%, transparent 35%),
        radial-gradient(circle at 82% 78%, rgba(255, 255, 255, 0.18) 0%, transparent 40%);
    pointer-events: none;
}
.ui-auth-hero::after {
    content: '';
    position: absolute;
    inset: 0;
    background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='160' height='160' viewBox='0 0 160 160'><g fill='none' stroke='rgba(255,255,255,0.08)' stroke-width='1'><circle cx='80' cy='80' r='40'/><circle cx='80' cy='80' r='60'/><circle cx='80' cy='80' r='80'/></g></svg>");
    background-size: 220px 220px;
    opacity: 0.5;
    pointer-events: none;
}
.ui-auth-hero > * { position: relative; z-index: 1; }

.ui-auth-brand img { max-width: 200px; max-height: 56px; object-fit: contain; filter: brightness(0) invert(1); }
.ui-auth-brand h1, .ui-auth-brand h2, .ui-auth-brand h3, .ui-auth-brand h4 {
    color: #fff; font-weight: 700; letter-spacing: -0.01em; margin: 0;
}

.ui-auth-hero-title {
    font-size: 2.4rem;
    font-weight: 700;
    line-height: 1.18;
    color: #fff;
    margin: 0 0 0.75rem 0;
    letter-spacing: -0.02em;
}
.ui-auth-hero-subtitle {
    font-size: 1.05rem;
    line-height: 1.6;
    color: rgba(255, 255, 255, 0.86);
    margin: 0;
    max-width: 32rem;
}

.ui-auth-feature-list {
    list-style: none;
    padding: 0;
    margin: 2rem 0 0 0;
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
}
.ui-auth-feature-list li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: rgba(255, 255, 255, 0.94);
    font-size: 0.95rem;
}
.ui-auth-feature-list .ui-auth-feature-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.20);
    backdrop-filter: blur(8px);
    color: #fff;
    font-size: 1rem;
}

.ui-auth-hero-footer {
    margin-top: 2.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.18);
    color: rgba(255, 255, 255, 0.78);
    font-size: 0.82rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.5rem;
}

/* ---------- 登錄卡（右欄）---------- */
.ui-auth-card-wrap {
    position: relative;
    display: flex;
    flex-direction: column;
}
.ui-auth-card {
    flex: 1;
    background: var(--ui-auth-card-bg);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    border: 1px solid rgba(255, 255, 255, 0.6);
    border-radius: var(--ui-auth-radius);
    box-shadow: var(--ui-auth-shadow-lg);
    padding: 2.75rem 2.5rem;
    position: relative;
    overflow: hidden;
}
.ui-auth-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--ui-auth-primary), var(--ui-auth-accent), #a855f7);
}
@media (max-width: 575.98px) {
    .ui-auth-card { padding: 2rem 1.5rem; }
    .ui-auth-hero { padding: 2.25rem 1.5rem; }
    .ui-auth-hero-title { font-size: 1.8rem; }
}

.ui-auth-card-header {
    text-align: center;
    margin-bottom: 2rem;
}
.ui-auth-card-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--ui-auth-text);
    margin: 0.5rem 0 0.5rem 0;
    letter-spacing: -0.01em;
}
.ui-auth-card-subtitle {
    color: var(--ui-auth-text-muted);
    font-size: 0.95rem;
    margin: 0;
}

/* ---------- 表單美化 ---------- */
.ui-auth-form .form-group { margin-bottom: 1.1rem; }
.ui-auth-form .form-label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--ui-auth-text);
    margin-bottom: 0.4rem;
    display: block;
}
.ui-auth-input-wrap {
    position: relative;
    display: flex;
    align-items: center;
}
.ui-auth-input-wrap .ui-auth-input-icon {
    position: absolute;
    left: 1rem;
    color: var(--ui-auth-text-muted);
    pointer-events: none;
    font-size: 1.05rem;
    z-index: 1;
    transition: color 0.2s ease;
}
.ui-auth-form .form-control {
    width: 100%;
    height: 50px;
    padding: 0.75rem 1rem 0.75rem 2.75rem;
    font-size: 0.96rem;
    color: var(--ui-auth-text);
    background: #f8fafc;
    border: 1.5px solid var(--ui-auth-border);
    border-radius: 12px;
    transition: all 0.2s ease;
    box-shadow: none;
}
.ui-auth-form .form-control:hover {
    border-color: rgba(79, 70, 229, 0.4);
    background: #fff;
}
.ui-auth-form .form-control:focus {
    outline: none;
    border-color: var(--ui-auth-primary);
    background: #fff;
    box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.12);
}
.ui-auth-form .form-control:focus + .ui-auth-input-icon,
.ui-auth-form .form-control:focus ~ .ui-auth-input-icon {
    color: var(--ui-auth-primary);
}
.ui-auth-form .form-control.is-invalid {
    border-color: #ef4444;
    background: #fff;
}
.ui-auth-form .invalid-feedback {
    font-size: 0.82rem;
    margin-top: 0.3rem;
    color: #ef4444;
}

/* 密碼切換按鈕美化 */
.ui-auth-form .passcode-switch {
    position: absolute;
    right: 0.5rem;
    top: 50%;
    transform: translateY(-50%);
    width: 36px;
    height: 36px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    color: var(--ui-auth-text-muted);
    z-index: 2;
    transition: all 0.2s ease;
}
.ui-auth-form .passcode-switch:hover {
    color: var(--ui-auth-primary);
    background: rgba(79, 70, 229, 0.08);
}

/* 記住我 & 忘記密碼 */
.ui-auth-form-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin: 1.1rem 0 1.5rem 0;
    flex-wrap: wrap;
    gap: 0.5rem;
}
.ui-auth-form-row .custom-checkbox {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.88rem;
    color: var(--ui-auth-text-muted);
    cursor: pointer;
    user-select: none;
}
.ui-auth-form-row .custom-checkbox input {
    width: 18px;
    height: 18px;
    accent-color: var(--ui-auth-primary);
    cursor: pointer;
}
.ui-auth-form-row .link-primary {
    color: var(--ui-auth-primary);
    font-weight: 500;
    font-size: 0.88rem;
    text-decoration: none;
    transition: color 0.2s ease;
}
.ui-auth-form-row .link-primary:hover { color: var(--ui-auth-primary-dark); text-decoration: underline; }

/* 提交按鈕 */
.ui-auth-submit {
    width: 100%;
    height: 52px;
    border: none;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--ui-auth-primary) 0%, var(--ui-auth-primary-dark) 100%);
    color: #fff;
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: 0.01em;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 10px 24px -10px rgba(79, 70, 229, 0.6);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    position: relative;
    overflow: hidden;
}
.ui-auth-submit::before {
    content: '';
    position: absolute;
    top: 0; left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.25), transparent);
    transition: left 0.6s ease;
}
.ui-auth-submit:hover {
    transform: translateY(-1px);
    box-shadow: 0 14px 28px -10px rgba(79, 70, 229, 0.7);
}
.ui-auth-submit:hover::before { left: 100%; }
.ui-auth-submit:active { transform: translateY(0); }
.ui-auth-submit:focus-visible {
    outline: 3px solid rgba(79, 70, 229, 0.4);
    outline-offset: 2px;
}
.ui-auth-submit:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}
.ui-auth-submit .ui-auth-submit-spinner {
    display: none;
    width: 18px;
    height: 18px;
    border: 2px solid rgba(255, 255, 255, 0.4);
    border-top-color: #fff;
    border-radius: 50%;
    animation: ui-auth-spin 0.7s linear infinite;
}
.ui-auth-submit.is-loading .ui-auth-submit-spinner { display: inline-block; }
.ui-auth-submit.is-loading .ui-auth-submit-text { opacity: 0.6; }
@keyframes ui-auth-spin { to { transform: rotate(360deg); } }

/* 分隔線 */
.ui-auth-divider {
    display: flex;
    align-items: center;
    gap: 1rem;
    color: var(--ui-auth-text-muted);
    font-size: 0.82rem;
    margin: 1.5rem 0;
}
.ui-auth-divider::before,
.ui-auth-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--ui-auth-border);
}

/* 底部鏈接 */
.ui-auth-footer {
    text-align: center;
    margin-top: 1.5rem;
    font-size: 0.9rem;
    color: var(--ui-auth-text-muted);
}
.ui-auth-footer a {
    color: var(--ui-auth-primary);
    font-weight: 600;
    text-decoration: none;
    transition: color 0.2s ease;
}
.ui-auth-footer a:hover { color: var(--ui-auth-primary-dark); text-decoration: underline; }

/* 錯誤提示卡 */
.ui-auth-alert {
    padding: 0.85rem 1rem;
    border-radius: 12px;
    margin-bottom: 1.25rem;
    font-size: 0.88rem;
    display: flex;
    align-items: center;
    gap: 0.6rem;
}
.ui-auth-alert-danger {
    background: #fef2f2;
    color: #b91c1c;
    border: 1px solid #fecaca;
}
.ui-auth-alert-success {
    background: #f0fdf4;
    color: #15803d;
    border: 1px solid #bbf7d0;
}

/* 語言選擇器美化 */
.ui-auth-card .auth-language-selector {
    margin: 0 0 1rem 0;
    max-width: 100%;
}
.ui-auth-card .auth-language-selector select {
    width: 100%;
    height: 44px;
    border: 1.5px solid var(--ui-auth-border);
    border-radius: 10px;
    background: #f8fafc;
    padding: 0 1rem;
    font-size: 0.9rem;
    color: var(--ui-auth-text);
    cursor: pointer;
}

/* a11y focus rings */
.ui-auth-form .form-control:focus-visible,
.ui-auth-submit:focus-visible {
    outline: none;
}
.ui-auth-card a:focus-visible,
.ui-auth-card button:focus-visible {
    outline: 2px solid var(--ui-auth-primary);
    outline-offset: 2px;
    border-radius: 6px;
}

/* ---------- 註冊表單雙欄佈局 ---------- */
.ui-auth-form-row-2col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0 1rem;
}
@media (max-width: 575.98px) {
    .ui-auth-form-row-2col {
        grid-template-columns: 1fr;
    }
}

/* ---------- Select 下拉框美化 ---------- */
.ui-auth-form select.form-control {
    width: 100%;
    height: 50px;
    padding: 0.75rem 1rem;
    font-size: 0.96rem;
    color: var(--ui-auth-text);
    background: #f8fafc;
    border: 1.5px solid var(--ui-auth-border);
    border-radius: 12px;
    transition: all 0.2s ease;
    box-shadow: none;
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'><path fill='%2364748b' d='M6 8L1 3h10z'/></svg>");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    padding-right: 2.5rem;
    cursor: pointer;
}
.ui-auth-form select.form-control:hover {
    border-color: rgba(79, 70, 229, 0.4);
    background-color: #fff;
}
.ui-auth-form select.form-control:focus {
    outline: none;
    border-color: var(--ui-auth-primary);
    background-color: #fff;
    box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.12);
}

/* ---------- Hero body flex ---------- */
.ui-auth-hero-body {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
}