/**
 * 通用样式与设计令牌
 * 定义全局色板、间距、圆角、阴影等基础变量，以及 EP 组件基础样式。
 */

:root {
    /* 品牌色板 */
    --ep-brand: #0e7490;
    --ep-brand-dark: #155e75;
    --ep-brand-deep: #0c4a5e;
    --ep-brand-soft: #dff1f6;
    --ep-brand-softer: #f0f9fb;

    --ep-accent: #f59e0b;
    --ep-accent-soft: #fef3e2;
    --ep-accent-deep: #b45309;

    --ep-success: #16a34a;
    --ep-success-soft: #e9f9ef;
    --ep-danger: #dc2626;
    --ep-danger-soft: #fef2f2;

    /* 中性色 */
    --ep-ink: #1f2937;
    --ep-text: #4b5563;
    --ep-muted: #9ca3af;
    --ep-border: #e5e7eb;
    --ep-border-strong: #d1d5db;
    --ep-bg: #f8fafc;
    --ep-surface: #ffffff;

    /* 圆角 / 阴影 */
    --ep-radius-sm: 8px;
    --ep-radius: 12px;
    --ep-radius-lg: 18px;
    --ep-shadow-sm: 0 1px 2px rgba(16, 24, 40, 0.06), 0 1px 3px rgba(16, 24, 40, 0.10);
    --ep-shadow: 0 6px 16px rgba(16, 24, 40, 0.08), 0 2px 4px rgba(16, 24, 40, 0.04);
    --ep-shadow-lg: 0 24px 60px rgba(16, 24, 40, 0.24);
    --ep-ring: 0 0 0 3px rgba(14, 116, 144, 0.18);

    --ep-font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    --ep-transition: 0.2s ease;
}

#ep-lens-modal,
#ep-lens-modal * {
    box-sizing: border-box;
}

#ep-lens-modal {
    font-family: var(--ep-font);
    color: var(--ep-text);
    -webkit-font-smoothing: antialiased;
}

/* 通用按钮样式 */
.ep-select-lens-btn,
.ep-back-btn,
.ep-next-btn,
.ep-add-to-cart-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border: none;
    border-radius: 10px;
    font-family: inherit;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--ep-transition);
    text-align: center;
    letter-spacing: 0.2px;
    line-height: 1.2;
    text-decoration: none;
}

/* 主 CTA：选择镜片按钮 */
.ep-select-lens-btn {
    background: linear-gradient(135deg, var(--ep-brand), var(--ep-brand-dark));
    color: #ffffff !important;
    box-shadow: 0 4px 14px rgba(14, 116, 144, 0.32);
    margin: 12px 0;
}

.ep-select-lens-btn:hover {
    background: linear-gradient(135deg, var(--ep-brand-dark), var(--ep-brand-deep));
    color: #ffffff !important;
    box-shadow: 0 6px 18px rgba(14, 116, 144, 0.38);
    transform: translateY(-1px);
}

.ep-select-lens-btn .ep-btn-icon {
    display: inline-flex;
    width: 20px;
    height: 20px;
}

.ep-select-lens-btn .ep-btn-icon svg {
    width: 100%;
    height: 100%;
}

/* 返回按钮 */
.ep-back-btn {
    background-color: var(--ep-surface);
    color: var(--ep-ink);
    border: 1px solid var(--ep-border-strong);
    box-shadow: var(--ep-shadow-sm);
}

.ep-back-btn:hover {
    background-color: var(--ep-bg);
    border-color: var(--ep-muted);
    transform: translateY(-1px);
}

/* 主操作按钮 */
.ep-next-btn,
.ep-add-to-cart-btn {
    background: linear-gradient(135deg, var(--ep-brand), var(--ep-brand-dark));
    color: #ffffff;
    box-shadow: 0 2px 8px rgba(14, 116, 144, 0.28);
}

.ep-next-btn:hover,
.ep-add-to-cart-btn:hover {
    background: linear-gradient(135deg, var(--ep-brand-dark), var(--ep-brand-deep));
    box-shadow: 0 4px 12px rgba(14, 116, 144, 0.32);
    transform: translateY(-1px);
}

.ep-next-btn:disabled,
.ep-add-to-cart-btn:disabled {
    background: var(--ep-border);
    color: var(--ep-muted);
    cursor: not-allowed;
    box-shadow: none;
    transform: none;
}

.ep-next-btn:disabled:hover,
.ep-add-to-cart-btn:disabled:hover {
    background: var(--ep-border);
    box-shadow: none;
    transform: none;
}

/* 按钮按下的微交互 */
.ep-next-btn:active:not(:disabled),
.ep-add-to-cart-btn:active:not(:disabled),
.ep-select-lens-btn:active {
    transform: translateY(0) scale(0.97);
}

/* 通用旋转动画（用于各种 spinner） */
@keyframes ep-spin {
    to { transform: rotate(360deg); }
}

/* 防止正文在模态窗口打开时滚动 */
body.modal-open {
    overflow: hidden;
    position: fixed;
    width: 100%;
    height: 100%;
}