/* ==================== 主题CSS变量系统 ==================== */

/* 主题1：更淡的淡蓝色天空（默认） */
:root {
    --theme-bg-1: #f5faff;
    --theme-bg-2: #e8f4ff;
    --theme-bg-3: #d4eafc;
    --theme-bg-4: #a8d4f8;
    --theme-primary-light: #81c7f1;
    --theme-primary: #64b5f6;
    --theme-primary-dark: #42a5f5;
    --theme-accent: #64b5f6;
    --theme-border: rgba(212, 234, 252, 0.5);
    --theme-card-bg-gradient-1: #f7fbff;
    --theme-card-bg-gradient-2: #e8f4ff;
    --theme-header-bg: linear-gradient(135deg, #64b5f6, #42a5f5);
    --theme-footer-bg: rgba(212, 234, 252, 0.9);
    --theme-bg-gradient: linear-gradient(180deg, var(--theme-bg-1) 0%, var(--theme-bg-2) 30%, var(--theme-bg-3) 60%, var(--theme-bg-4) 100%);
}

/* 主题2：梦幻紫粉天空 */
.theme-purple {
    --theme-bg-1: #fff5f8;
    --theme-bg-2: #fce4ec;
    --theme-bg-3: #f8bbd9;
    --theme-bg-4: #e1bee7;
    --theme-primary-light: #d4a5e4;
    --theme-primary: #ba68c8;
    --theme-primary-dark: #ab47bc;
    --theme-accent: #ab47bc;
    --theme-border: rgba(225, 190, 231, 0.5);
    --theme-card-bg-gradient-1: #faf3fb;
    --theme-card-bg-gradient-2: #f3e5f5;
    --theme-header-bg: linear-gradient(135deg, #ba68c8, #ab47bc);
    --theme-footer-bg: rgba(248, 187, 217, 0.9);
    --theme-bg-gradient: linear-gradient(180deg, #fff5f8 0%, #fce4ec 30%, #f8bbd9 60%, #e1bee7 100%);
}

/* 主题3：极光绿蓝 */
.theme-cyan {
    --theme-bg-1: #f0fafb;
    --theme-bg-2: #e0f7fa;
    --theme-bg-3: #80deea;
    --theme-bg-4: #4dd0e1;
    --theme-primary-light: #4dd0e1;
    --theme-primary: #26c6da;
    --theme-primary-dark: #00acc1;
    --theme-accent: #00acc1;
    --theme-border: rgba(128, 222, 234, 0.5);
    --theme-card-bg-gradient-1: #f0fafb;
    --theme-card-bg-gradient-2: #e0f7fa;
    --theme-header-bg: linear-gradient(135deg, #26c6da, #00acc1);
    --theme-footer-bg: rgba(128, 222, 234, 0.9);
    --theme-bg-gradient: linear-gradient(180deg, #f0fafb 0%, #e0f7fa 30%, #80deea 60%, #4dd0e1 100%);
}

/* 主题4：海蓝琥珀 */
.theme-amber {
    --theme-bg-1: #f5fbff;
    --theme-bg-2: #e3f2fd;
    --theme-bg-3: #90caf9;
    --theme-bg-4: #ffcc80;
    --theme-primary-light: #ffab40;
    --theme-primary: #ff7043;
    --theme-primary-dark: #f4511e;
    --theme-accent: #2196f3;
    --theme-border: rgba(144, 202, 249, 0.5);
    --theme-card-bg-gradient-1: #fff5e6;
    --theme-card-bg-gradient-2: #ffe0b2;
    --theme-header-bg: linear-gradient(135deg, #ff7043, #f4511e);
    --theme-footer-bg: rgba(255, 204, 128, 0.9);
    --theme-bg-gradient: linear-gradient(180deg, #f5fbff 0%, #e3f2fd 30%, #90caf9 60%, #ff7043 100%);
}

/* 主题5：樱花雪夜 */
.theme-sakura {
    --theme-bg-1: #fff5f5;
    --theme-bg-2: #fff3f3;
    --theme-bg-3: #ffcdd2;
    --theme-bg-4: #f48fb1;
    --theme-primary-light: #9fa8da;
    --theme-primary: #7986cb;
    --theme-primary-dark: #5c6bc0;
    --theme-accent: #ec407a;
    --theme-border: rgba(255, 205, 210, 0.5);
    --theme-card-bg-gradient-1: #fff8f8;
    --theme-card-bg-gradient-2: #fce4ec;
    --theme-header-bg: linear-gradient(135deg, #7986cb, #5c6bc0);
    --theme-footer-bg: rgba(255, 205, 210, 0.9);
    --theme-bg-gradient: linear-gradient(180deg, #fff5f5 0%, #fff3f3 30%, #ffcdd2 60%, #f48fb1 100%);
}

/* 主题6：淡蓝色天空（原来的） */
.theme-blue-sky {
    --theme-bg-1: #e0f4ff;
    --theme-bg-2: #b3e0ff;
    --theme-bg-3: #87ceeb;
    --theme-bg-4: #4a90c2;
    --theme-primary-light: #81c7f1;
    --theme-primary: #64b5f6;
    --theme-primary-dark: #42a5f5;
    --theme-accent: #42a5f5;
    --theme-border: rgba(187, 222, 251, 0.5);
    --theme-card-bg-gradient-1: #f7fbff;
    --theme-card-bg-gradient-2: #e8f4ff;
    --theme-header-bg: linear-gradient(135deg, #64b5f6, #42a5f5);
    --theme-footer-bg: rgba(179, 224, 255, 0.9);
    --theme-bg-gradient: linear-gradient(180deg, #e0f4ff 0%, #b3e0ff 30%, #87ceeb 60%, #4a90c2 100%);
}