/* ===== 新颜色方案 ===== */
:root {
    /* 黑白主色 + 橙色强调 + 绿色点缀 */
    --primary: #ff7300;
    --primary-light: #ff9d4d;
    --secondary: #41b883;
    --secondary-dark: #2d8b61;
    --text: #2c3e50;
    --text-light: #7f8c8d;
    --light: #f8f9fa;
    --dark: #1a1a2e;
    --black: #0d0d0d;
    --white: #ffffff;
    --gray-100: #f2f2f2;
    --gray-200: #e0e0e0;
    --gray-600: #5e5e5e;

    /* 玻璃态效果 */
    --glass-bg: rgba(255, 255, 255, 0.85);
    --glass-border: rgba(255, 255, 255, 0.3);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);

    /* 响应式尺寸 */
    --max-width: 1200px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    transition: background 0.3s ease, transform 0.2s ease;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', 'PingFang SC', 'Helvetica Neue', sans-serif;
    background: linear-gradient(135deg, #f5f5f5 0%, #dbdbdb 100%);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    padding: 1rem;
    display: flex;
    justify-content: center;
    align-items: center;
}

@media (prefers-color-scheme: dark) {
    body {
        background: linear-gradient(135deg, #0a0a0a 0%, #1f1f1f 100%);
        color: #f0f0f0;
        --glass-bg: rgba(30, 30, 30, 0.8);
        --text: #e0e0e0;
        --text-light: #b0b0b0;
    }
}

/* ===== 玻璃态卡片基类 ===== */
.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
    border-radius: 24px;
    overflow: hidden;
    transition: all 0.3s ease;
}

/* ===== 登录页面样式 ===== */
.login-container {
    width: 100%;
    max-width: 480px;
    padding: 2.5rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.login-container h1 {
    text-align: center;
    font-size: 2.2rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    margin-bottom: 1rem;
}

.error {
    background: rgba(231, 76, 60, 0.15);
    color: #e74c3c;
    padding: 1rem;
    border-radius: 12px;
    text-align: center;
    margin-bottom: 1rem;
    backdrop-filter: blur(4px);
}

.input-group {
    position: relative;
    margin-bottom: 1.5rem;
}

.input-group i {
    position: absolute;
    left: 1.2rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--primary);
    font-size: 1.2rem;
}

.input-group input {
    width: 100%;
    padding: 1.2rem 1.2rem 1.2rem 3.5rem;
    border: none;
    background: rgba(255, 255, 255, 0.7);
    border-radius: 16px;
    font-size: 1rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
    color: var(--black);
}

.input-group input:focus {
    background: rgba(255, 255, 255, 0.95);
    outline: none;
    box-shadow: 0 4px 20px rgba(255, 115, 0, 0.2);
}

button {
    width: 100%;
    padding: 1.2rem;
    border: none;
    border-radius: 16px;
    background: linear-gradient(to right, var(--primary), var(--primary-light));
    color: white;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    letter-spacing: 0.5px;
    box-shadow: 0 6px 20px rgba(255, 115, 0, 0.3);
}

button:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(255, 115, 0, 0.4);
}