/* ========== 登录/解绑页面样式 - 全新毛玻璃设计 ========== */

:root {
    --bg-primary: #f8fafc;
    --bg-secondary: rgba(255, 255, 255, 0.72);
    --text-primary: #1e293b;
    --text-secondary: #475569;
    --text-tertiary: #94a3b8;
    --border-color: rgba(255, 255, 255, 0.45);
    --input-bg: rgba(255, 255, 255, 0.65);
    --input-border: rgba(203, 213, 225, 0.6);
    --accent-color: #6366f1;
    --accent-hover: #4f46e5;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
    --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.15);
    --error-color: #ef4444;
    --success-color: #10b981;
    --radius-md: 12px;
    --radius-lg: 20px;
    --glass-blur: 18px;
    --bg-gradient-start: rgba(99, 102, 241, 0.3);
    --bg-gradient-end: rgba(139, 92, 246, 0.2);
}

[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: rgba(15, 23, 42, 0.75);
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-tertiary: #94a3b8;
    --border-color: rgba(148, 163, 184, 0.15);
    --input-bg: rgba(30, 41, 59, 0.65);
    --input-border: rgba(71, 85, 105, 0.5);
    --accent-color: #818cf8;
    --accent-hover: #a5b4fc;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 40px rgba(129, 140, 248, 0.15);
    --bg-gradient-start: rgba(99, 102, 241, 0.2);
    --bg-gradient-end: rgba(15, 23, 42, 0.8);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    color: var(--text-primary);
    position: relative;
    overflow-x: hidden;
    background: #0a0a1a;
}

/* 全屏背景图 */
body::before {
    content: '';
    position: fixed; top: 0; left: 0;
    width: 100%; height: 100%;
    background: url('/api/bg.php') center/cover no-repeat;
    z-index: -2;
}
body::after {
    content: '';
    position: fixed; top: 0; left: 0;
    width: 100%; height: 100%;
    background: linear-gradient(135deg, var(--bg-gradient-start), var(--bg-gradient-end));
    z-index: -1;
}


.container { width: 100%; max-width: 440px; position: relative; z-index: 1; }

.theme-toggle-btn {
    position: absolute; top: -60px; right: 0;
    width: 42px; height: 42px; border-radius: 50%;
    border: 1px solid var(--border-color);
    background: var(--bg-secondary);
    backdrop-filter: blur(12px);
    color: var(--text-primary);
    font-size: 18px; cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    transition: all 0.3s; box-shadow: var(--shadow-md);
}
.theme-toggle-btn:hover { border-color: var(--accent-color); color: var(--accent-color); transform: translateY(-2px) rotate(20deg); box-shadow: var(--shadow-glow); }

.back-link {
    position: absolute; top: -60px; left: 0;
    padding: 10px 18px; background: var(--bg-secondary);
    backdrop-filter: blur(12px);
    color: var(--text-secondary); border: 1px solid var(--border-color);
    border-radius: var(--radius-md); font-size: 14px; font-weight: 500;
    cursor: pointer; transition: all 0.3s; text-decoration: none;
    display: flex; align-items: center; gap: 6px; box-shadow: var(--shadow-md);
}
.back-link:hover { border-color: var(--accent-color); color: var(--accent-color); transform: translateY(-2px); box-shadow: var(--shadow-glow); }

.login-card {
    background: var(--bg-secondary);
    backdrop-filter: blur(var(--glass-blur)) saturate(180%);
    -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(180%);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg), var(--shadow-glow), inset 0 1px 0 rgba(255,255,255,0.2);
    padding: 44px 40px;
    border: 1px solid var(--border-color);
    position: relative; overflow: hidden;
    animation: cardEntry 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}
.login-card::before {
    content: '';
    position: absolute; top: 0; left: 0; right: 0;
    height: 3px;
    background: linear-gradient(90deg, #6366f1, #a855f7, #ec4899, #6366f1);
    background-size: 300% 100%;
    animation: gradientFlow 4s linear infinite;
}

.header { text-align: center; margin-bottom: 36px; }
.header h1 { font-size: 26px; margin-bottom: 10px; font-weight: 700; color: var(--text-primary); }
.subtitle { font-size: 14px; color: var(--text-secondary); }

.input-group { margin-bottom: 24px; }
.input-group label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 8px; color: var(--text-primary); letter-spacing: 0.5px; text-transform: uppercase; }

.login-input {
    width: 100%; height: 50px; padding: 0 18px; font-size: 15px;
    border: 2px solid var(--input-border); border-radius: var(--radius-md);
    background: var(--input-bg); backdrop-filter: blur(8px);
    color: var(--text-primary);
    transition: all 0.3s; outline: none;
}
.login-input::placeholder { color: var(--text-tertiary); }
.login-input:focus { border-color: var(--accent-color); box-shadow: 0 0 0 4px rgba(99,102,241,0.12), 0 4px 12px rgba(99,102,241,0.1); }

.login-btn {
    width: 100%; height: 52px;
    background: linear-gradient(135deg, #6366f1, #8b5cf6);
    color: #fff; border: none; border-radius: var(--radius-md);
    font-size: 16px; font-weight: 600; cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative; overflow: hidden;
}
.login-btn::after {
    content: '';
    position: absolute; top: 50%; left: 50%;
    width: 0; height: 0;
    background: rgba(255,255,255,0.2);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}
.login-btn:active::after { width: 300px; height: 300px; }
.login-btn:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(99,102,241,0.4); }
.login-btn:disabled { background: var(--text-tertiary); cursor: not-allowed; transform: none !important; box-shadow: none !important; }

.alert-box {
    padding: 14px 16px; border-radius: var(--radius-md); margin-bottom: 20px;
    display: none; font-size: 14px; border: 1px solid transparent;
    backdrop-filter: blur(8px); font-weight: 500;
}
.alert-box.error { background: rgba(239, 68, 68, 0.12); border-color: rgba(239, 68, 68, 0.25); color: var(--error-color); }

.page-loader {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: url('/api/bg.php') center/cover no-repeat;
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    z-index: 9999; transition: opacity 0.25s ease, visibility 0.25s ease;
}
.page-loader::after {
    content: ''; position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.45);
}
.page-loader.hidden { opacity: 0; visibility: hidden; pointer-events: none; }
.loader-spinner {
    width: 48px; height: 48px;
    border: 3px solid rgba(255,255,255,0.2); border-radius: 50%;
    border-top-color: #a5b4fc; border-right-color: #818cf8;
    animation: spin 0.8s ease-in-out infinite; z-index: 1;
}

@keyframes spin { to { transform: rotate(360deg); } }
@keyframes cardEntry {
    from { opacity: 0; transform: translateY(30px) scale(0.96); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}
@keyframes gradientFlow { 0% { background-position: 0% 50%; } 100% { background-position: 300% 50%; } }

/* 响应式 */
@media (max-width: 768px) {
    .container { padding: 0 16px; }
    .login-card { padding: 32px 24px; }
    h1 { font-size: 22px; }
    .subtitle { font-size: 13px; }
    .login-input { padding: 12px 14px; font-size: 16px; }
    .login-btn { padding: 13px; font-size: 15px; }
}

@media (max-width: 480px) {
    .container { padding: 0 12px; }
    .login-card { padding: 28px 18px; border-radius: 16px; }
    h1 { font-size: 20px; }
    .back-link { font-size: 13px; top: -50px; left: 0; padding: 8px 14px; }
    .theme-toggle-btn { top: -50px; right: 0; width: 38px; height: 38px; }
}

@media (max-width: 360px) {
    .login-card { padding: 22px 14px; }
    .login-input { padding: 11px 12px; }
}