/* Premium Minimalist UI Design System */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

:root {
    /* Color Palette - Premium Zinc/Monochrome Theme */
    --primary-50: #fafafa;
    --primary-100: #f4f4f5;
    --primary-200: #e4e4e7;
    --primary-300: #d4d4d8;
    --primary-400: #a1a1aa;
    --primary-500: #71717a;
    --primary-600: #52525b;
    --primary-700: #3f3f46;
    --primary-800: #27272a;
    --primary-900: #18181b;
    --primary-950: #09090b;
    
    --secondary-50: #fafafa;
    --secondary-100: #f4f4f5;
    --secondary-200: #e4e4e7;
    --secondary-500: #71717a;
    --secondary-800: #27272a;
    --secondary-900: #09090b;

    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    --info: #3b82f6;

    /* Semantic Colors */
    --bg-body: #fafafa;
    --bg-card: #ffffff;
    --text-main: #09090b;
    --text-muted: #71717a;
    --border-color: #e4e4e7;

    /* Modern Soft Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.03), 0 1px 3px rgba(0, 0, 0, 0.02);
    --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.04), 0 2px 6px rgba(0, 0, 0, 0.02);
    --shadow-xl: 0 24px 48px rgba(0, 0, 0, 0.06), 0 8px 16px rgba(0, 0, 0, 0.03);
    
    --radius-sm: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-full: 9999px;
    
    --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-body);
    color: var(--text-main);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    color: var(--primary-950);
    font-weight: 700;
    letter-spacing: -0.03em;
}

/* Buttons */
.ui-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.25rem;
    font-size: 0.9375rem;
    font-weight: 600;
    border-radius: var(--radius-lg);
    border: 1px solid transparent;
    cursor: pointer;
    transition: var(--transition);
    gap: 0.5rem;
    user-select: none;
}

.ui-btn:active {
    transform: scale(0.97);
}

.ui-btn-primary {
    background: var(--primary-950);
    color: white;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.ui-btn-primary:hover {
    background: var(--primary-800);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.12);
    transform: translateY(-1px);
}

.ui-btn-secondary {
    background: white;
    border: 1px solid var(--primary-200);
    color: var(--primary-900);
    box-shadow: var(--shadow-sm);
}

.ui-btn-secondary:hover {
    background: var(--primary-50);
    border-color: var(--primary-300);
}

.ui-btn-danger {
    background: white;
    border: 1px solid #fee2e2;
    color: var(--error);
}

.ui-btn-danger:hover {
    background: #fef2f2;
    border-color: #fca5a5;
}

.ui-btn-success {
    background: var(--success);
    color: white;
}

/* Inputs */
.ui-input {
    width: 100%;
    padding: 0.75rem 1.25rem;
    border: 1px solid var(--primary-200);
    border-radius: var(--radius-lg);
    background-color: white;
    color: var(--text-main);
    font-size: 0.9375rem;
    transition: var(--transition);
    font-family: inherit;
}

.ui-input:focus {
    outline: none;
    border-color: var(--primary-950);
    box-shadow: 0 0 0 4px var(--primary-100);
}

.ui-input::placeholder {
    color: var(--primary-400);
}

/* Custom Select */
.ui-select-wrapper {
    position: relative;
    width: 100%;
}

.ui-select-trigger {
    width: 100%;
    padding: 0.75rem 2.5rem 0.75rem 1.25rem;
    border: 1px solid var(--primary-200);
    border-radius: var(--radius-lg);
    background-color: white;
    color: var(--text-main);
    font-size: 0.9375rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: space-between;
    user-select: none;
}

.ui-select-trigger::after {
    content: '';
    position: absolute;
    right: 1.25rem;
    top: 50%;
    transform: translateY(-50%);
    width: 0;
    height: 0;
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;
    border-top: 5px solid var(--primary-500);
    transition: transform 0.2s;
}

.ui-select-wrapper.open .ui-select-trigger::after {
    transform: translateY(-50%) rotate(180deg);
}

.ui-select-trigger:hover {
    border-color: var(--primary-300);
}

.ui-select-wrapper.open .ui-select-trigger,
.ui-select-trigger:focus {
    outline: none;
    border-color: var(--primary-950);
    box-shadow: 0 0 0 4px var(--primary-100);
}

.ui-select-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    right: 0;
    background: white;
    border: 1px solid var(--primary-200);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    z-index: 1000;
    max-height: 240px;
    overflow-y: auto;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: var(--transition);
}

.ui-select-wrapper.open .ui-select-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.ui-select-option {
    padding: 0.75rem 1.25rem;
    cursor: pointer;
    transition: background 0.15s;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9375rem;
    color: var(--primary-700);
}

.ui-select-option:hover {
    background: var(--primary-50);
}

.ui-select-option.selected {
    background: var(--primary-50);
    color: var(--primary-950);
    font-weight: 600;
}

/* 兼容旧的 select */
select.ui-input,
select.ui-select {
    width: 100%;
    padding: 0.75rem 2.5rem 0.75rem 1.25rem;
    border: 1px solid var(--primary-200);
    border-radius: var(--radius-lg);
    background-color: white;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2371717a' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    background-size: 1rem;
    color: var(--text-main);
    font-size: 0.9375rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    appearance: none;
}

select.ui-input:focus,
select.ui-select:focus {
    outline: none;
    border-color: var(--primary-950);
    box-shadow: 0 0 0 4px var(--primary-100);
}

/* Cards */
.ui-card {
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    border: 1px solid var(--primary-200);
    box-shadow: var(--shadow-lg);
    padding: 2rem;
}

/* Notifications */
#notification-container {
    position: fixed;
    top: 1rem;
    right: 1rem;
    left: 1rem;
    z-index: 50;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 0.5rem;
    pointer-events: none;
}

@media (min-width: 640px) {
    #notification-container {
        top: 2rem;
        right: 2rem;
    }
}

.notification {
    min-width: 280px;
    max-width: 100%;
    padding: 1rem 1.25rem;
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--primary-100);
    transform: translateY(-20px) scale(0.95);
    opacity: 0;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.875rem;
    pointer-events: auto;
}

.notification.show {
    transform: translateY(0) scale(1);
    opacity: 1;
}

.notification-icon {
    flex-shrink: 0;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    color: white;
}

.notification-success .notification-icon { background: var(--success); }
.notification-error .notification-icon { background: var(--error); }
.notification-warning .notification-icon { background: var(--warning); }
.notification-info .notification-icon { background: var(--primary-900); }

.notification-message {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--primary-900);
}

/* Modal */
.ui-modal {
    position: fixed;
    inset: 0;
    z-index: 40;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s;
    padding: 1rem;
}

.ui-modal.show {
    opacity: 1;
    pointer-events: auto;
}

.ui-modal-overlay {
    position: absolute;
    inset: 0;
    background: rgba(9, 9, 11, 0.5); /* Zinc 950 with opacity */
    backdrop-filter: blur(8px);
}

.ui-modal-content {
    position: relative;
    background: white;
    width: 100%;
    max-width: 480px;
    max-height: 90vh;
    border-radius: 24px;
    box-shadow: var(--shadow-xl);
    padding: 2rem;
    transform: translateY(20px) scale(0.95);
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    overflow-y: auto;
}

.ui-modal.show .ui-modal-content {
    transform: translateY(0) scale(1);
}

.ui-modal-content h3 {
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
    color: var(--primary-950);
}

.ui-modal-actions {
    margin-top: 2rem;
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
}

/* Utilities */
.text-sm { font-size: 0.875rem; }
.text-muted { color: var(--primary-500); }
.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }
.flex { display: flex; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: 0.5rem; }
.gap-4 { gap: 1rem; }
.mt-4 { margin-top: 1rem; }
.mb-4 { margin-bottom: 1rem; }