/*
 * 打赏网站样式 - Linux.do Credit 风格
 * 基于 Linux.do Credit 原版 UI 设计
 */

/* ===== 颜色变量 ===== */
:root {
    /* 背景色 */
    --bg-primary: #0a0a0a;           /* 主背景 - 纯黑 */
    --bg-secondary: #1a1a1a;         /* 卡片背景 - 深灰 */
    --bg-tertiary: #252525;          /* 输入框背景 */
    --bg-hover: #2a2a2a;             /* 悬停状态 */

    /* 文字颜色 */
    --text-primary: #ffffff;         /* 主要文字 - 白色 */
    --text-secondary: #a0a0a0;       /* 次要文字 - 浅灰 */
    --text-muted: #666666;           /* 辅助文字 - 中灰 */

    /* 强调色 */
    --accent-primary: #f5f5f5;       /* 主按钮背景 - 浅色 */
    --accent-text: #0a0a0a;          /* 主按钮文字 - 深色 */
    --accent-red: #ef4444;           /* 必填标记 - 红色 */

    /* 边框 */
    --border-color: #333333;         /* 边框颜色 */
    --border-radius: 12px;           /* 统一圆角 */
    --border-radius-lg: 16px;        /* 大圆角 */

    /* 阴影 */
    --shadow-sm: 0 2px 8px 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);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
                 "Helvetica Neue", Arial, "Noto Sans", sans-serif,
                 "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    line-height: 1.6;
}

/* ===== 容器 ===== */
.container {
    max-width: 480px;
    width: 100%;
}

/* ===== 卡片样式 ===== */
.reward-card {
    background: var(--bg-secondary);
    border-radius: var(--border-radius-lg);
    padding: 32px 24px;
    box-shadow: var(--shadow-md);
}

/* ===== 头部 ===== */
.header {
    text-align: center;
    margin-bottom: 32px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border-color);
}

.header-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto 16px;
    background: var(--bg-tertiary);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
}

.header h1 {
    font-size: 24px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.header p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* ===== 区块标题 ===== */
.section-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 4px;
}

.section-title .required {
    color: var(--accent-red);
    font-size: 16px;
}

/* ===== 表单区域 ===== */
.form-section {
    margin-bottom: 24px;
}

/* ===== 预设金额按钮 ===== */
.preset-amounts {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-bottom: 16px;
}

.amount-btn {
    padding: 14px 12px;
    background: var(--bg-tertiary);
    border: 2px solid transparent;
    border-radius: var(--border-radius);
    color: var(--text-primary);
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    white-space: nowrap;
}

.amount-btn:hover {
    background: var(--bg-hover);
    border-color: var(--border-color);
}

.amount-btn.active {
    background: var(--accent-primary);
    color: var(--accent-text);
    border-color: var(--accent-primary);
}

/* ===== 输入框 ===== */
.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    gap: 12px;
}

.input-label {
    padding: 14px 20px;
    background: var(--bg-tertiary);
    border-radius: var(--border-radius);
    color: var(--text-secondary);
    font-size: 16px;
    font-weight: 600;
    min-width: 70px;
    text-align: center;
    border: 2px solid transparent;
}

.form-input {
    flex: 1;
    width: 100%;
    padding: 14px 16px;
    background: var(--bg-tertiary);
    border: 2px solid transparent;
    border-radius: var(--border-radius);
    color: var(--text-primary);
    font-size: 16px;
    font-family: inherit;
    transition: all 0.2s ease;
}

.form-input:focus {
    outline: none;
    background: var(--bg-hover);
    border-color: var(--border-color);
}

.form-input::placeholder {
    color: var(--text-muted);
}

/* Textarea */
.form-textarea {
    width: 100%;
    padding: 14px 16px;
    background: var(--bg-tertiary);
    border: 2px solid transparent;
    border-radius: var(--border-radius);
    color: var(--text-primary);
    font-size: 14px;
    font-family: inherit;
    resize: vertical;
    min-height: 100px;
    line-height: 1.6;
    transition: all 0.2s ease;
}

.form-textarea:focus {
    outline: none;
    background: var(--bg-hover);
    border-color: var(--border-color);
}

.form-textarea::placeholder {
    color: var(--text-muted);
}

/* ===== 提示文字 ===== */
.form-hint {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 8px;
    line-height: 1.5;
}

/* ===== 错误提示 ===== */
.error-message {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid var(--accent-red);
    color: var(--accent-red);
    padding: 12px 16px;
    border-radius: var(--border-radius);
    font-size: 14px;
    margin-bottom: 20px;
    display: none;
}

.error-message.show {
    display: block;
    animation: shake 0.4s ease;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-8px); }
    75% { transform: translateX(8px); }
}

/* ===== 按钮组 ===== */
.button-group {
    display: flex;
    gap: 12px;
    margin-top: 32px;
}

/* ===== 按钮样式 ===== */
.btn {
    flex: 1;
    padding: 14px 24px;
    border: none;
    border-radius: var(--border-radius);
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: var(--accent-primary);
    color: var(--accent-text);
}

.btn-primary:hover:not(:disabled) {
    background: #ffffff;
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--bg-tertiary);
    border-color: var(--text-muted);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* ===== 加载状态 ===== */
.btn-loading {
    pointer-events: none;
}

.btn-loading .btn-text {
    opacity: 0;
}

.btn-loading::after {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    top: 50%;
    left: 50%;
    margin-left: -8px;
    margin-top: -8px;
    border: 2px solid transparent;
    border-top-color: currentColor;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

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

/* ===== 页脚 ===== */
.footer {
    text-align: center;
    margin-top: 24px;
    padding: 16px;
}

.footer-text {
    font-size: 13px;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.footer-icon {
    width: 16px;
    height: 16px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.footer a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s ease;
}

.footer a:hover {
    color: var(--text-primary);
}

/* ===== 订单信息卡片 ===== */
.order-info {
    background: var(--bg-tertiary);
    border-radius: var(--border-radius);
    padding: 16px;
    margin: 20px 0;
}

.order-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 0;
    border-bottom: 1px solid var(--border-color);
}

.order-item:last-child {
    border-bottom: none;
}

.order-label {
    font-size: 14px;
    color: var(--text-secondary);
}

.order-value {
    font-size: 14px;
    color: var(--text-primary);
    font-weight: 500;
}

.order-amount {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
}

/* ===== 状态图标 ===== */
.status-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 20px;
    background: var(--bg-tertiary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
}

.status-icon.success {
    background: rgba(34, 197, 94, 0.1);
    color: #22c55e;
}

.status-icon.pending {
    background: rgba(251, 191, 36, 0.1);
    color: #fbbf24;
}

/* ===== 加载动画 ===== */
.loading-container {
    text-align: center;
    padding: 40px 20px;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    margin: 0 auto 16px;
    border: 3px solid var(--bg-tertiary);
    border-top-color: var(--text-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.loading-text {
    font-size: 14px;
    color: var(--text-secondary);
}

/* ===== 响应式设计 ===== */
@media (max-width: 640px) {
    body {
        padding: 16px;
    }

    .container {
        max-width: 100%;
    }

    .reward-card {
        padding: 24px 20px;
    }

    .header h1 {
        font-size: 20px;
    }

    .preset-amounts {
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
    }

    .amount-btn {
        padding: 12px 10px;
        font-size: 15px;
    }

    .input-label {
        min-width: 60px;
        padding: 12px 16px;
        font-size: 15px;
    }

    .form-input,
    .form-textarea {
        font-size: 16px; /* 防止 iOS 自动缩放 */
    }

    .button-group {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }
}

/* ===== 平滑过渡 ===== */
.fade-in {
    animation: fadeIn 0.3s ease;
}

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

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