/* ==========================================================================
   HOTS Tools — Centralized Design System & Theme Tokens
   ========================================================================== */

:root {
    /* ---------------- Typography ---------------- */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', Menlo, Monaco, Consolas, monospace;

    /* ---------------- Spacing Scale (8, 12, 16, 24, 32, 48, 64) ---------------- */
    --space-1: 8px;
    --space-2: 12px;
    --space-3: 16px;
    --space-4: 24px;
    --space-5: 32px;
    --space-6: 48px;
    --space-7: 64px;

    /* ---------------- Radius System (8, 12, 14, 16) ---------------- */
    --radius-sm: 8px;   /* controls, buttons, badges, tabs, small items */
    --radius-md: 12px;  /* inputs, dropzones, cards, panels, list boxes */
    --radius-nav: 14px; /* top navigation */
    --radius-lg: 16px;  /* dialogs, modals, popovers */

    /* ---------------- Shadow System ---------------- */
    --shadow-none: none;
    --shadow-floating: 0 8px 24px rgba(0, 0, 0, 0.45);

    /* ---------------- Transitions ---------------- */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.2s ease;

    /* ---------------- Default Dark Theme Tokens (AGENTS.md Centralized Design Tokens) ---------------- */
    --color-bg: #0D0F13;
    --color-surface: #15181E;
    --color-surface-secondary: #1B1F27;
    --color-border: #252A33;
    --color-text-primary: #F3F4F6;
    --color-text-secondary: #9CA3AF;
    --color-text-muted: #6B7280;
    --color-accent: #7C5CFF;
    --color-accent-hover: #8B70FF;
    --color-accent-fg: #FFFFFF;

    /* ---------------- Semantic Feedback Tokens ---------------- */
    --color-success: #10B981;
    --color-danger: #EF4444;
    --color-warning: #F59E0B;

    /* ---------------- Backward Compatibility Variables ---------------- */
    --bg-color: var(--color-bg);
    --panel-bg: var(--color-surface);
    --surface-secondary: var(--color-surface-secondary);
    --border-color: var(--color-border);
    --text-color: var(--color-text-primary);
    --subtext-color: var(--color-text-secondary);
    --muted-color: var(--color-text-muted);
    --accent-color: var(--color-accent);
    --accent-hover: var(--color-accent-hover);
    --accent-fg: var(--color-accent-fg);
    --header-bg: var(--color-surface);
    --modal-bg: var(--color-surface);
    --output-bg: var(--color-surface-secondary);
    --secondary-btn-bg: var(--color-surface-secondary);
    --secondary-btn-hover-bg: var(--color-border);
    --option-bg: var(--color-surface);
    --success-color: var(--color-success);
    --danger-color: var(--color-danger);
    --danger-hover: #f87171;
    --tip-color: var(--color-success);
    --tip-border: rgba(16, 185, 129, 0.2);
    --status-online-bg: rgba(16, 185, 129, 0.12);
    --status-online-border: rgba(16, 185, 129, 0.25);
    --status-online-text: #10B981;
    --badge-bg: var(--status-online-bg);
    --badge-border: var(--status-online-border);
    --badge-text: var(--status-online-text);
}

/* Light Theme Tokens */
[data-theme="light"],
body.theme-light {
    --color-bg: #F7F7F8;
    --color-surface: #FFFFFF;
    --color-surface-secondary: #F1F1F3;
    --color-border: #E4E4E7;
    --color-text-primary: #18181B;
    --color-text-secondary: #71717A;
    --color-text-muted: #A1A1AA;
    --color-accent: #6D4AFF;
    --color-accent-hover: #5B3FE0;
    --color-accent-fg: #FFFFFF;

    --color-success: #059669;
    --color-danger: #DC2626;
    --color-warning: #D97706;

    --shadow-floating: 0 8px 24px rgba(0, 0, 0, 0.08);
    --status-online-bg: rgba(5, 150, 105, 0.08);
    --status-online-border: rgba(5, 150, 105, 0.25);
    --status-online-text: #059669;
    --badge-bg: var(--status-online-bg);
    --badge-border: var(--status-online-border);
    --badge-text: var(--status-online-text);
}

/* Dark Theme Explicit */
[data-theme="dark"],
body.theme-dark {
    --color-bg: #0D0F13;
    --color-surface: #15181E;
    --color-surface-secondary: #1B1F27;
    --color-border: #252A33;
    --color-text-primary: #F3F4F6;
    --color-text-secondary: #9CA3AF;
    --color-text-muted: #6B7280;
    --color-accent: #7C5CFF;
    --color-accent-hover: #8B70FF;
    --color-accent-fg: #FFFFFF;

    --color-success: #10B981;
    --color-danger: #EF4444;
    --color-warning: #F59E0B;

    --shadow-floating: 0 8px 24px rgba(0, 0, 0, 0.45);
    --status-online-bg: rgba(16, 185, 129, 0.12);
    --status-online-border: rgba(16, 185, 129, 0.25);
    --status-online-text: #10B981;
    --badge-bg: var(--status-online-bg);
    --badge-border: var(--status-online-border);
    --badge-text: var(--status-online-text);
}

/* Warm Paper Theme (护眼羊皮纸模式) */
[data-theme="warm"],
body.theme-warm {
    --color-bg: #F5F2EB;
    --color-surface: #FAF8F5;
    --color-surface-secondary: #ECE7DE;
    --color-border: #DDD7CD;
    --color-text-primary: #2D2926;
    --color-text-secondary: #6E665E;
    --color-text-muted: #999086;
    --color-accent: #B45309;
    --color-accent-hover: #92400E;
    --color-accent-fg: #FFFFFF;

    --color-success: #059669;
    --color-danger: #DC2626;
    --color-warning: #D97706;

    --shadow-floating: 0 8px 24px rgba(45, 41, 38, 0.09);
    --status-online-bg: rgba(5, 150, 105, 0.08);
    --status-online-border: rgba(5, 150, 105, 0.25);
    --status-online-text: #059669;
    --badge-bg: var(--status-online-bg);
    --badge-border: var(--status-online-border);
    --badge-text: var(--status-online-text);
}

/* Midnight OLED Theme (极致纯黑模式) */
[data-theme="oled"],
body.theme-oled {
    --color-bg: #000000;
    --color-surface: #0C0C0E;
    --color-surface-secondary: #141418;
    --color-border: #23232A;
    --color-text-primary: #FFFFFF;
    --color-text-secondary: #A1A1AA;
    --color-text-muted: #71717A;
    --color-accent: #8B70FF;
    --color-accent-hover: #9D85FF;
    --color-accent-fg: #FFFFFF;

    --color-success: #10B981;
    --color-danger: #EF4444;
    --color-warning: #F59E0B;

    --shadow-floating: 0 8px 24px rgba(0, 0, 0, 0.85);
    --status-online-bg: rgba(16, 185, 129, 0.12);
    --status-online-border: rgba(16, 185, 129, 0.35);
    --status-online-text: #10B981;
    --badge-bg: var(--status-online-bg);
    --badge-border: var(--status-online-border);
    --badge-text: var(--status-online-text);
}

/* High Contrast Theme (♿ 极客高对比模式) */
[data-theme="contrast"],
body.theme-contrast {
    --color-bg: #000000;
    --color-surface: #000000;
    --color-surface-secondary: #121212;
    --color-border: #888888;
    --color-text-primary: #FFFFFF;
    --color-text-secondary: #D4D4D8;
    --color-text-muted: #A1A1AA;
    --color-accent: #38BDF8;
    --color-accent-hover: #0284C7;
    --color-accent-fg: #000000;

    --color-success: #10B981;
    --color-danger: #EF4444;
    --color-warning: #F59E0B;

    --shadow-floating: 0 0 0 1px #FFFFFF, 0 8px 24px rgba(0, 0, 0, 0.9);
    --status-online-bg: rgba(16, 185, 129, 0.2);
    --status-online-border: #10B981;
    --status-online-text: #10B981;
    --badge-bg: var(--status-online-bg);
    --badge-border: var(--status-online-border);
    --badge-text: var(--status-online-text);
}

/* Global Reset & Base Setup */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    background-color: var(--color-bg);
    color-scheme: light dark;
}

body {
    font-family: var(--font-sans);
    background-color: var(--color-bg);
    color: var(--color-text-primary);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    min-height: 100vh;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Base Form & Interactive Elements */
input, button, select, textarea {
    font-family: inherit;
    color: inherit;
}

/* Centralized Theme Popover Controls */
.theme-popover-menu {
    position: absolute;
    top: 48px;
    right: 0;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-3);
    width: 230px;
    box-shadow: var(--shadow-floating);
    display: none;
    flex-direction: column;
    gap: var(--space-2);
    z-index: 10000;
    text-align: left;
}

.theme-popover-menu.show {
    display: flex;
    animation: theme-popover-fade 0.18s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes theme-popover-fade {
    from { opacity: 0; transform: translateY(-6px) scale(0.97); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

.theme-popover-title {
    font-size: 11px;
    font-weight: 600;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 2px;
}

.theme-mode-tabs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    background: var(--color-surface-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 3px;
    gap: 3px;
}

.theme-mode-tabs button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 5px;
    background: none;
    border: 1px solid transparent;
    padding: 6px 6px;
    font-size: 11.5px;
    font-weight: 500;
    color: var(--color-text-secondary);
    cursor: pointer;
    border-radius: calc(var(--radius-sm) - 2px);
    transition: all var(--transition-fast);
    outline: none;
    text-align: center;
    white-space: nowrap;
    font-family: inherit;
}

.theme-mode-tabs button:hover {
    color: var(--color-text-primary);
    background: rgba(255, 255, 255, 0.04);
}

.theme-mode-tabs button.active {
    background: var(--color-accent);
    color: var(--color-accent-fg);
    font-weight: 600;
}

.theme-mode-tabs button.full-width {
    grid-column: span 2;
}

/* ==========================================================================
   Design System Primitives: Buttons, Inputs, Cards, Dialogs, Dropdowns, Nav
   ========================================================================== */

/* ---------------- 1. Buttons (8px radius) ---------------- */
.btn-primary,
button.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-1);
    background: var(--color-accent);
    color: var(--color-accent-fg);
    border: 1px solid var(--color-accent);
    border-radius: var(--radius-sm);
    padding: 8px var(--space-3);
    font-family: inherit;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: background-color var(--transition-fast), border-color var(--transition-fast), opacity var(--transition-fast);
    white-space: nowrap;
}

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

.btn-primary:disabled,
.btn-primary[disabled] {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

.btn-secondary,
button.btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-1);
    background: var(--color-surface-secondary);
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 7px var(--space-3);
    font-family: inherit;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    transition: border-color var(--transition-fast), color var(--transition-fast), background-color var(--transition-fast);
    white-space: nowrap;
}

.btn-secondary:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.btn-danger,
button.btn-danger {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-1);
    background: var(--color-surface-secondary);
    color: var(--color-danger);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 7px var(--space-3);
    font-family: inherit;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.btn-danger:hover {
    border-color: var(--color-danger);
    background: var(--color-surface);
}

.btn-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    color: var(--color-text-secondary);
    border-radius: var(--radius-sm);
    padding: 4px;
    cursor: pointer;
    transition: color var(--transition-fast), background-color var(--transition-fast);
}

.btn-icon:hover {
    color: var(--color-text-primary);
    background: var(--color-surface-secondary);
}

/* ---------------- 2. Inputs & Form Controls (8px/12px radius) ---------------- */
input[type="text"],
input[type="search"],
input[type="number"],
select,
textarea {
    background: var(--color-surface-secondary);
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 8px var(--space-2);
    font-family: inherit;
    font-size: 13px;
    outline: none;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

input[type="text"]:focus,
input[type="search"]:focus,
input[type="number"]:focus,
select:focus,
textarea:focus {
    border-color: var(--color-accent);
    box-shadow: var(--focus-ring);
}

input[type="checkbox"],
input[type="radio"] {
    accent-color: var(--color-accent);
    cursor: pointer;
}

/* ---------------- 3. Cards & Panels (12px radius) ---------------- */
.card,
.panel-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-4);
}

/* ---------------- 4. Dialogs & Modals (16px radius) ---------------- */
.dialog-overlay,
.modal-overlay,
.modal-backdrop {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-normal);
}

.dialog-overlay.show,
.modal-overlay.show,
.modal-backdrop.show {
    opacity: 1;
    pointer-events: auto;
}

.dialog-content,
.modal-container,
.modal-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-floating);
    overflow: hidden;
    transform: scale(0.97);
    transition: transform var(--transition-normal);
}

.dialog-overlay.show .dialog-content,
.modal-overlay.show .modal-card,
.modal-backdrop.show .modal-container {
    transform: scale(1);
}

/* ---------------- 5. Dropdowns (12px radius) ---------------- */
.dropdown-menu,
.lang-dropdown-menu {
    position: absolute;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-floating);
    padding: 6px;
    z-index: 10000;
}

/* ---------------- 6. Top Navigation (14px radius) ---------------- */
header.nav-floating,
header {
    width: 100%;
    max-width: 1200px;
    min-height: 64px;
    margin: var(--space-3) auto 0;
    padding: 12px var(--space-4);
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-radius: var(--radius-nav);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

@media (max-width: 1240px) {
    header.nav-floating,
    header {
        width: auto;
        margin-left: var(--space-3);
        margin-right: var(--space-3);
    }
}

@media (max-width: 768px) {
    header.nav-floating,
    header {
        margin: var(--space-2) var(--space-2) 0;
        padding: 10px 12px;
        min-height: 56px;
        gap: 8px;
    }

    .modal-container,
    .modal-card {
        width: 95% !important;
        max-width: 95vw !important;
        max-height: 90vh !important;
    }
}

@media (max-width: 480px) {
    header.nav-floating,
    header {
        padding: 8px 10px;
        border-radius: var(--radius-md);
    }

    .nav-controls {
        gap: 4px;
    }

    .nav-link {
        font-size: 12px;
        padding: 4px 6px;
    }
}

/* ---------------- 7. Online Status Badge (Centralized Component) ---------------- */
.online-badge {
    display: flex;
    align-items: center;
    gap: 6px;
    background: var(--status-online-bg);
    border: 1px solid var(--status-online-border);
    border-radius: var(--radius-sm);
    padding: 4px 10px;
    font-size: 12px;
    font-weight: 500;
    color: var(--status-online-text);
    white-space: nowrap;
    transition: opacity var(--transition-normal);
}

.online-badge .dot {
    width: 6px;
    height: 6px;
    background: var(--status-online-text);
    border-radius: 50%;
    animation: pulse-dot 2s ease-in-out infinite;
    flex-shrink: 0;
}

@keyframes pulse-dot {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.4; transform: scale(0.8); }
}