/* ============================================
   CSS Variables - 設計系統
   ============================================ */

:root {
    /* === 顏色系統 === */

    /* 主色調 */
    --color-primary: #3b82f6;
    --color-primary-hover: #2563eb;
    --color-primary-light: #93c5fd;
    --color-primary-dark: #1d4ed8;

    /* 次要色調 */
    --color-secondary: #6366f1;
    --color-secondary-hover: #4f46e5;

    /* 成功/警告/錯誤/資訊 */
    --color-success: #22c55e;
    --color-success-light: #86efac;
    --color-warning: #f59e0b;
    --color-warning-light: #fcd34d;
    --color-error: #ef4444;
    --color-error-light: #fca5a5;
    --color-info: #06b6d4;
    --color-info-light: #67e8f9;

    /* 灰階 */
    --color-gray-50: #f9fafb;
    --color-gray-100: #f3f4f6;
    --color-gray-200: #e5e7eb;
    --color-gray-300: #d1d5db;
    --color-gray-400: #9ca3af;
    --color-gray-500: #6b7280;
    --color-gray-600: #4b5563;
    --color-gray-700: #374151;
    --color-gray-800: #1f2937;
    --color-gray-900: #111827;

    /* === 亮色主題（預設）=== */
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f3f4f6;
    --bg-hover: #e5e7eb;

    --text-primary: #111827;
    --text-secondary: #4b5563;
    --text-tertiary: #6b7280;
    --text-muted: #9ca3af;
    --text-inverse: #ffffff;

    --border-color: #e5e7eb;
    --border-color-light: #f3f4f6;
    --border-color-dark: #d1d5db;

    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

    /* === 間距系統 === */
    --spacing-xs: 0.25rem;   /* 4px */
    --spacing-sm: 0.5rem;    /* 8px */
    --spacing-md: 1rem;      /* 16px */
    --spacing-lg: 1.5rem;    /* 24px */
    --spacing-xl: 2rem;      /* 32px */
    --spacing-2xl: 3rem;     /* 48px */
    --spacing-3xl: 4rem;     /* 64px */

    /* === 字體系統 === */
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans TC", sans-serif;
    --font-family-mono: "SF Mono", "Monaco", "Inconsolata", "Fira Mono", "Droid Sans Mono", monospace;

    --font-size-xs: 0.75rem;    /* 12px */
    --font-size-sm: 0.875rem;   /* 14px */
    --font-size-md: 1rem;       /* 16px */
    --font-size-lg: 1.125rem;   /* 18px */
    --font-size-xl: 1.25rem;    /* 20px */
    --font-size-2xl: 1.5rem;    /* 24px */
    --font-size-3xl: 1.875rem;  /* 30px */
    --font-size-4xl: 2.25rem;   /* 36px */

    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;

    /* === 圓角 === */
    --radius-sm: 0.25rem;   /* 4px */
    --radius-md: 0.375rem;  /* 6px */
    --radius-lg: 0.5rem;    /* 8px */
    --radius-xl: 0.75rem;   /* 12px */
    --radius-2xl: 1rem;     /* 16px */
    --radius-full: 9999px;

    /* === 過渡動畫 === */
    --transition-fast: 150ms ease;
    --transition-normal: 200ms ease;
    --transition-slow: 300ms ease;

    /* === 佈局 === */
    --header-height: 60px;
    --sidebar-width: 260px;
    --sidebar-collapsed-width: 64px;
    --content-max-width: 1400px;

    /* === Z-index === */
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-fixed: 300;
    --z-modal-backdrop: 400;
    --z-modal: 500;
    --z-popover: 600;
    --z-tooltip: 700;
    --z-toast: 800;
}

/* === 靛藍深色主題 === */
[data-theme="dark"],
[data-theme="indigo"] {
    --color-primary: #8b9cff;
    --color-primary-hover: #a8b4ff;
    --color-primary-light: #c7d2fe;
    --color-primary-dark: #6366f1;
    --color-secondary: #38bdf8;
    --color-secondary-hover: #7dd3fc;

    --bg-primary: #202a44;
    --bg-secondary: #182238;
    --bg-tertiary: #2d3a5d;
    --bg-hover: #37476d;

    --text-primary: #f8fbff;
    --text-secondary: #d8e2f7;
    --text-tertiary: #b6c4e2;
    --text-muted: #98a9cb;
    --text-inverse: #111a2d;

    --border-color: #3b4b73;
    --border-color-light: #475981;
    --border-color-dark: #142033;

    --shadow-sm: 0 1px 2px 0 rgba(8, 15, 30, 0.28);
    --shadow-md: 0 10px 24px -16px rgba(8, 15, 30, 0.55);
    --shadow-lg: 0 18px 36px -20px rgba(8, 15, 30, 0.65);
    --shadow-xl: 0 24px 48px -22px rgba(8, 15, 30, 0.75);
}

/* === 海藍主題 === */
[data-theme="ocean"] {
    --color-primary: #0f766e;
    --color-primary-hover: #115e59;
    --color-primary-light: #5eead4;
    --color-primary-dark: #134e4a;
    --color-secondary: #2563eb;
    --color-secondary-hover: #1d4ed8;

    --bg-primary: #f8fffd;
    --bg-secondary: #eefbf8;
    --bg-tertiary: #dff7f1;
    --bg-hover: #c8eee8;

    --text-primary: #10231f;
    --text-secondary: #31514b;
    --text-tertiary: #55736d;
    --text-muted: #71918a;
    --text-inverse: #ffffff;

    --border-color: #c9e6df;
    --border-color-light: #def3ee;
    --border-color-dark: #9fcac0;
}