/**
 * 安西军 - 共享样式系统
 * 统一颜色、排版、按钮、表单、响应式
 */

/* ========== CSS 变量 ========== */
:root {
    /* 背景色 */
    --bg-dark: #0a1628;
    --bg-mid: #0d2137;
    --bg-panel: rgba(13, 33, 55, 0.92);
    --bg-card: #ffffff;

    /* 主色调 */
    --primary: #64b4ff;
    --primary-dark: #3a8dd4;
    --primary-light: rgba(100, 180, 255, 0.15);
    --accent: #64b4ff;
    --accent-glow: rgba(126, 200, 255, 0.25);

    /* 文字颜色 */
    --text: #ffffff;
    --text-muted: rgba(255, 255, 255, 0.75);
    --text-secondary: #a0aec0;
    --text-dark: #1a202c;
    --text-muted-dark: #718096;

    /* 边框 */
    --border: rgba(100, 180, 255, 0.35);
    --border-light: rgba(100, 180, 255, 0.2);

    /* 输入框 */
    --input-bg: rgba(255, 255, 255, 0.06);
    --input-bg-dark: #f7fafc;
    --input-border: #d9d9d9;
    --input-focus: #1677ff;

    /* 状态色 */
    --success: #51cf66;
    --success-bg: rgba(81, 207, 102, 0.15);
    --error: #ff6b6b;
    --error-bg: rgba(255, 107, 107, 0.15);
    --warning: #fbbf24;

    /* 阴影 */
    --shadow: 0 8px 24px rgba(15, 23, 42, 0.12);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.2);
    --shadow-card: 0 4px 12px rgba(0, 0, 0, 0.08);

    /* 圆角 */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;

    /* 间距 */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;

    /* 字体 */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;

    /* 过渡 */
    --transition: all 0.25s ease;
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    line-height: 1.5;
    color: var(--text);
    min-height: 100vh;
    overflow-x: hidden;
}

/* ========== 布局 ========== */
.page-wrap {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
}

.page-wrap.split-view {
    justify-content: space-between;
    gap: 60px;
}

/* ========== 背景效果 ========== */
.bg-lines {
    position: fixed;
    inset: 0;
    background-image: repeating-linear-gradient(
        -55deg,
        transparent,
        transparent 80px,
        rgba(100, 180, 255, 0.03) 80px,
        rgba(100, 180, 255, 0.03) 81px
    );
    pointer-events: none;
    z-index: 0;
}

.bg-glow {
    position: fixed;
    left: -10%;
    top: 20%;
    width: 55%;
    height: 60%;
    background: radial-gradient(
        ellipse 80% 70% at 30% 50%,
        rgba(100, 180, 255, 0.12) 0%,
        rgba(100, 180, 255, 0.04) 40%,
        transparent 70%
    );
    pointer-events: none;
    z-index: 0;
}

/* ========== 卡片组件 ========== */
.card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    padding: var(--spacing-lg);
    position: relative;
    z-index: 1;
    max-width: 420px;
    width: 100%;
}

.card--dark {
    background: var(--bg-panel);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border);
}

.card--dark .card-header {
    border-bottom: 1px solid var(--border-light);
    padding-bottom: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

/* ========== 品牌区域 ========== */
.hero-section {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--spacing-xl);
}

.hero-logo {
    max-width: 400px;
}

.hero-logo img {
    width: 180px;
    height: 180px;
    border-radius: 36px;
    box-shadow: 0 0 50px rgba(255, 140, 0, 0.5);
    margin-bottom: var(--spacing-lg);
}

.hero-title {
    font-size: 28px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: var(--spacing-sm);
    letter-spacing: 0.02em;
}

.hero-subtitle {
    font-size: 15px;
    color: var(--text-muted);
    margin-bottom: var(--spacing-xs);
}

.hero-slogan {
    font-size: 13px;
    color: var(--primary);
    letter-spacing: 0.04em;
}

/* ========== 表单 ========== */
.form-group {
    margin-bottom: var(--spacing-md);
}

.form-label {
    display: block;
    font-size: 13px;
    color: var(--text-dark);
    margin-bottom: 6px;
    font-weight: 500;
}

.form-label--dark {
    color: var(--text-muted);
}

.form-input {
    width: 100%;
    padding: 12px 14px;
    background: var(--input-bg-dark);
    border: 1px solid var(--input-border);
    border-radius: var(--radius-md);
    font-size: 15px;
    color: var(--text-dark);
    transition: var(--transition);
}

.form-input:focus {
    outline: none;
    border-color: var(--input-focus);
    box-shadow: 0 0 0 3px rgba(22, 119, 255, 0.15);
}

.form-input::placeholder {
    color: #a0aec0;
}

.form-input--dark {
    background: var(--input-bg);
    border-color: var(--border);
    color: var(--text);
}

.form-input--dark:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(100, 180, 255, 0.15);
}

.form-tip {
    font-size: 12px;
    color: var(--text-muted-dark);
    margin-top: 6px;
}

/* ========== 按钮 ========== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 20px;
    border: none;
    border-radius: var(--radius-md);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    white-space: nowrap;
}

.btn-full {
    width: 100%;
}

.btn-primary {
    background: #1677ff;
    color: #fff;
}

.btn-primary:hover {
    background: #4096ff;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(22, 119, 255, 0.3);
}

.btn-primary--dark {
    background: linear-gradient(135deg, #1677ff 0%, #4096ff 100%);
    color: #fff;
}

.btn-success {
    background: var(--success);
    color: #fff;
}

.btn-success:hover {
    background: #40c057;
}

.btn-danger {
    background: var(--error);
    color: #fff;
}

.btn-danger:hover {
    background: #fa5252;
}

.btn-outline {
    background: transparent;
    color: var(--primary);
    border: 1px solid var(--primary);
}

.btn-outline:hover {
    background: var(--primary-light);
}

.btn:disabled,
.btn.btn-disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

/* 加载状态 */
.btn .loading {
    display: inline-block;
    width: 14px;
    height: 14px;
    border: 2px solid currentColor;
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
    margin-right: 8px;
}

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

/* ========== 消息提示 ========== */
.message {
    padding: 12px 16px;
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    font-size: 14px;
    display: none;
}

.message.error {
    background: var(--error-bg);
    color: var(--error);
    display: block;
}

.message.success {
    background: var(--success-bg);
    color: var(--success);
    display: block;
}

/* ========== 链接 ========== */
.link {
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition);
}

.link:hover {
    text-decoration: underline;
    color: var(--primary-dark);
}

/* ========== 动画 ========== */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes slideIn {
    from { opacity: 0; transform: translateX(-20px); }
    to { opacity: 1; transform: translateX(0); }
}

.animate-fade-in {
    animation: fadeIn 0.4s ease forwards;
}

.animate-slide-in {
    animation: slideIn 0.4s ease forwards;
}

/* 页面加载淡入 */
.page-enter {
    animation: fadeIn 0.5s ease;
}

/* ========== 响应式断点 ========== */

/* 大屏平板 */
@media (max-width: 1100px) {
    .page-wrap.split-view {
        justify-content: center;
        padding: 24px 20px;
        gap: 30px;
    }

    .hero-section {
        display: none;
    }

    .card {
        max-width: 480px;
    }
}

/* 移动端横屏 */
@media (max-width: 900px) {
    .page-wrap {
        padding: 16px 14px;
        align-items: flex-start;
    }

    .page-wrap.split-view {
        padding: 16px 14px 80px;
        min-height: auto;
    }

    .card {
        padding: 20px 16px;
    }

    body {
        background-attachment: scroll;
    }
}

/* 手机竖屏 */
@media (max-width: 480px) {
    .page-wrap {
        padding: 12px 10px;
    }

    .card {
        padding: 16px 14px;
        border-radius: var(--radius-md);
    }

    .form-input {
        padding: 11px 12px;
        font-size: 14px;
    }

    .btn {
        padding: 12px 16px;
        font-size: 14px;
        min-height: 44px;
    }

    .hero-title {
        font-size: 22px;
    }

    .hero-subtitle {
        font-size: 13px;
    }
}

/* 小屏手机 */
@media (max-width: 360px) {
    .page-wrap {
        padding: 8px 6px;
    }

    .card {
        padding: 14px 12px;
    }

    .form-group {
        margin-bottom: 12px;
    }

    .btn {
        min-height: 42px;
        font-size: 13px;
    }
}

/* ========== 无障碍 ========== */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

.btn:focus-visible,
.form-input:focus-visible,
.link:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

/* ========== 工具类 ========== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }

.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }

.flex { display: flex; }
.flex-center { align-items: center; justify-content: center; }
.flex-between { justify-content: space-between; }
.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }