/**
 * Study Lattice - Components CSS
 * Glass Cards, Buttons, Forms, Inputs
 * Glass Morphism Design System
 */

/* ============================================
   GLASS CARDS
   ============================================ */
.glass-card {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0.02) 100%);
    backdrop-filter: var(--blur-md) saturate(180%);
    -webkit-backdrop-filter: var(--blur-md) saturate(180%);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    box-shadow: var(--shadow-md), inset 0 1px 1px rgba(255, 255, 255, 0.05);
    transition: background var(--transition-normal), transform var(--transition-normal), box-shadow var(--transition-normal);
}

.day-mode .glass-card {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.25) 0%, rgba(255, 255, 255, 0.1) 100%);
    box-shadow: var(--shadow-md), inset 0 1px 1px rgba(255, 255, 255, 0.4);
}

/* No hover state on base glass-card - use .glass-card-hover for hover effects */

/* Card Hover Lift Effect */
.glass-card-hover:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

/* Card Sizes */
.glass-card-sm {
    padding: var(--space-md);
    border-radius: var(--radius-md);
}

.glass-card-lg {
    padding: var(--space-xl);
    border-radius: var(--radius-xl);
}

/* Card with Accent Border */
.glass-card-accent {
    border-left: 3px solid var(--accent);
}

/* Card Clickable */
.glass-card-clickable {
    cursor: pointer;
}

.glass-card-clickable:active {
    transform: scale(0.98);
}


/* ============================================
   BUTTONS
   ============================================ */

/* Base Button */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-lg);
    font-family: 'Manrope', sans-serif;
    font-size: 0.9rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    text-decoration: none;
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-normal);
    outline: none;
    white-space: nowrap;
}

.btn:focus-visible {
    box-shadow: 0 0 0 3px var(--accent-soft);
}

/* Primary Button - Solid Accent */
.btn-primary {
    background: var(--accent);
    color: var(--text-inverse);
    box-shadow: 0 4px 15px var(--accent-glow);
}

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px var(--accent-glow);
}

.btn-primary:active {
    transform: translateY(0);
}

/* Secondary Button - Glass */
.btn-secondary {
    background: var(--glass-bg);
    backdrop-filter: var(--blur-sm);
    -webkit-backdrop-filter: var(--blur-sm);
    border: 1px solid var(--glass-border);
    color: var(--text-primary);
}

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

/* Outline Button */
.btn-outline {
    background: transparent;
    border: 2px solid var(--accent);
    color: var(--accent);
}

.btn-outline:hover {
    background: var(--accent);
    color: var(--text-inverse);
}

/* Ghost Button */
.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
    padding: var(--space-sm) var(--space-md);
}

.btn-ghost:hover {
    background: var(--glass-bg);
    color: var(--text-primary);
}

/* Danger Button */
.btn-danger {
    background: transparent;
    border: 2px solid var(--error);
    color: var(--error);
}

.btn-danger:hover {
    background: var(--error);
    color: white;
}

/* Button Sizes */
.btn-sm {
    padding: var(--space-sm) var(--space-md);
    font-size: 0.8rem;
}

.btn-lg {
    padding: var(--space-lg) var(--space-xl);
    font-size: 1rem;
}

/* Button Icon */
.btn-icon {
    width: 44px;
    height: 44px;
    padding: 0;
    border-radius: 50%;
}

.btn-icon svg {
    width: 20px;
    height: 20px;
    stroke: currentColor;
    stroke-width: 1.5;
    fill: none;
}

/* Button with Icon */
.btn svg {
    width: 18px;
    height: 18px;
    stroke: currentColor;
    stroke-width: 2;
    fill: none;
}

/* Disabled Button */
.btn:disabled,
.btn-disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}


/* ============================================
   FORM INPUTS
   ============================================ */

/* Input Base */
.input {
    width: 100%;
    padding: var(--space-md);
    font-family: 'Manrope', sans-serif;
    font-size: 1rem;
    color: var(--text-primary);
    background: var(--glass-bg);
    backdrop-filter: var(--blur-sm);
    -webkit-backdrop-filter: var(--blur-sm);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    outline: none;
    transition: all var(--transition-fast);
}

.input::placeholder {
    color: var(--text-muted);
}

.input:hover {
    border-color: var(--glass-hover);
}

.input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-soft);
    background: var(--glass-hover);
}

/* Input Error State */
.input-error {
    border-color: var(--error) !important;
}

.input-error:focus {
    box-shadow: 0 0 0 3px var(--error-soft);
}

/* Input Success State */
.input-success {
    border-color: var(--success) !important;
}

.input-success:focus {
    box-shadow: 0 0 0 3px var(--success-soft);
}

/* Textarea */
.textarea {
    min-height: 120px;
    resize: vertical;
}

/* Input Group */
.input-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.input-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.input-hint {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.input-error-text {
    font-size: 0.75rem;
    color: var(--error);
}

/* Autofill Styles */
input:-webkit-autofill,
input:-webkit-autofill:hover,
input:-webkit-autofill:focus {
    -webkit-text-fill-color: var(--text-primary);
    -webkit-box-shadow: 0 0 0px 1000px var(--glass-bg) inset;
    transition: background-color 5000s ease-in-out 0s;
}


/* ============================================
   CHECKBOX & RADIO
   ============================================ */

/* Checkbox */
.checkbox {
    appearance: none;
    -webkit-appearance: none;
    width: 22px;
    height: 22px;
    background: var(--glass-bg);
    border: 2px solid var(--glass-border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    position: relative;
    transition: all var(--transition-fast);
}

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

.checkbox:checked {
    background: var(--accent);
    border-color: var(--accent);
}

.checkbox:checked::after {
    content: '';
    position: absolute;
    left: 6px;
    top: 2px;
    width: 6px;
    height: 12px;
    border: solid var(--text-inverse);
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.checkbox:focus-visible {
    box-shadow: 0 0 0 3px var(--accent-soft);
}

/* Radio */
.radio {
    appearance: none;
    -webkit-appearance: none;
    width: 22px;
    height: 22px;
    background: var(--glass-bg);
    border: 2px solid var(--glass-border);
    border-radius: 50%;
    cursor: pointer;
    position: relative;
    transition: all var(--transition-fast);
}

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

.radio:checked {
    border-color: var(--accent);
}

.radio:checked::after {
    content: '';
    position: absolute;
    left: 50%;
    top: 50%;
    width: 10px;
    height: 10px;
    background: var(--accent);
    border-radius: 50%;
    transform: translate(-50%, -50%);
}

.radio:focus-visible {
    box-shadow: 0 0 0 3px var(--accent-soft);
}


/* ============================================
   SELECT
   ============================================ */
.select {
    appearance: none;
    -webkit-appearance: none;
    width: 100%;
    padding: var(--space-md);
    padding-right: var(--space-xl);
    font-family: 'Manrope', sans-serif;
    font-size: 1rem;
    color: var(--text-primary);
    background: var(--glass-bg);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23ffffff' 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 var(--space-md) center;
    background-size: 16px;
    backdrop-filter: var(--blur-sm);
    -webkit-backdrop-filter: var(--blur-sm);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    outline: none;
    transition: all var(--transition-fast);
}

.day-mode .select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%230f172a' 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");
}

.select:hover {
    border-color: var(--glass-hover);
}

.select:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-soft);
}


/* ============================================
   CUSTOM SELECT (Cross-browser dropdown)
   ============================================ */

/* Container */
.custom-select {
    position: relative;
    width: 100%;
    font-family: 'Manrope', sans-serif;
    user-select: none;
}

/* Hidden native select for form submission */
.custom-select-native {
    position: absolute;
    opacity: 0;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    pointer-events: none;
}

/* The visible trigger/button */
.select-trigger {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-sm);
    padding: var(--space-md);
    padding-right: var(--space-md);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-normal);

    /* Night mode (default) - Glassmorphism */
    background: var(--glass-bg);
    backdrop-filter: var(--blur-sm);
    -webkit-backdrop-filter: var(--blur-sm);
    border: 1px solid var(--glass-border);
    color: var(--text-primary);
    font-size: 1rem;
}

.select-trigger:hover {
    border-color: var(--glass-hover);
}

.custom-select.open .select-trigger,
.custom-select:focus-within .select-trigger {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-soft);
}

/* Selected value text */
.select-value {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.select-value.placeholder {
    color: var(--text-muted);
}

/* Arrow icon */
.select-arrow {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
    stroke: var(--text-secondary);
    stroke-width: 2;
    fill: none;
    transition: transform var(--transition-normal);
}

.custom-select.open .select-arrow {
    transform: rotate(180deg);
}

/* Dropdown options container */
.select-options {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    right: 0;
    z-index: var(--z-dropdown);
    border-radius: var(--radius-md);
    overflow: hidden;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-normal);
    max-height: 280px;
    overflow-y: auto;

    /* Night mode glassmorphism */
    background: var(--glass-bg-solid);
    backdrop-filter: var(--blur-lg);
    -webkit-backdrop-filter: var(--blur-lg);
    border: 1px solid var(--glass-border);
    box-shadow: var(--shadow-lg);
}

.custom-select.open .select-options {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

/* Individual options */
.select-option {
    padding: var(--space-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.select-option:hover {
    background: var(--accent-soft);
}

.select-option.selected {
    background: var(--accent-soft);
    color: var(--accent);
    font-weight: 500;
}

/* Checkmark for selected option */
.select-option.selected::after {
    content: '';
    margin-left: auto;
    width: 16px;
    height: 16px;
    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='%2334D399' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: center;
    background-size: contain;
}

.day-mode .select-option.selected::after {
    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='%23059669' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'%3E%3C/polyline%3E%3C/svg%3E");
}

/* Mobile touch targets */
@media (max-width: 768px) {
    .select-option {
        min-height: 48px;
    }
}


/* ============================================
   BADGES & TAGS
   ============================================ */
.badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-xs) var(--space-sm);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-radius: var(--radius-full);
    white-space: nowrap;
}

.badge-primary,
.badge-success {
    background: var(--accent-soft);
    color: var(--accent);
}

.badge-warning {
    background: var(--warning-soft);
    color: var(--warning);
}

/* Day mode badge overrides for better visibility */
.day-mode .badge-warning {
    background: rgba(255, 152, 0, 0.15);
    color: #e65100;
}

.badge-error {
    background: var(--error-soft);
    color: var(--error);
}

.badge-info {
    background: var(--info-soft);
    color: var(--info);
}

/* Tag - Solid variant */
.tag {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-xs) var(--space-sm);
    font-size: 0.75rem;
    font-weight: 500;
    color: white;
    border-radius: var(--radius-sm);
}

.tag-public { background: #FF9800; }
.tag-private { background: #278bb0; }
.tag-admin { background: #4CAF50; }


/* ============================================
   AVATARS
   ============================================ */
.avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--glass-bg);
    border: 2px solid var(--glass-border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    color: var(--accent);
    overflow: hidden;
}

.avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.avatar-sm { width: 32px; height: 32px; font-size: 0.75rem; }
.avatar-lg { width: 56px; height: 56px; font-size: 1.25rem; }
.avatar-xl { width: 80px; height: 80px; font-size: 1.75rem; }


/* ============================================
   DIVIDERS
   ============================================ */
.divider {
    height: 1px;
    background: var(--glass-border);
    margin: var(--space-lg) 0;
}

.divider-vertical {
    width: 1px;
    height: 100%;
    background: var(--glass-border);
    margin: 0 var(--space-md);
}


/* ============================================
   LOADING STATES
   ============================================ */
.spinner {
    width: 24px;
    height: 24px;
    border: 3px solid var(--glass-border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.spinner-sm { width: 16px; height: 16px; border-width: 2px; }
.spinner-lg { width: 40px; height: 40px; border-width: 4px; }

/* Skeleton Loading */
.skeleton {
    background: linear-gradient(90deg, var(--glass-bg) 25%, var(--glass-hover) 50%, var(--glass-bg) 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s ease-in-out infinite;
    border-radius: var(--radius-sm);
}

@keyframes skeleton-loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}


/* ============================================
   ICONS
   ============================================ */
.icon {
    width: 24px;
    height: 24px;
    stroke: currentColor;
    stroke-width: 1.5;
    fill: none;
    flex-shrink: 0;
}

.icon-sm { width: 18px; height: 18px; }
.icon-lg { width: 32px; height: 32px; }
.icon-xl { width: 48px; height: 48px; }


/* ============================================
   TABLES
   ============================================ */
.table-glass {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    background: var(--glass-bg);
    backdrop-filter: var(--blur-sm);
    -webkit-backdrop-filter: var(--blur-sm);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.table-glass th,
.table-glass td {
    padding: var(--space-md);
    text-align: left;
    border-bottom: 1px solid var(--glass-border);
}

.table-glass th {
    font-weight: 600;
    color: var(--text-primary);
    background: var(--glass-hover);
}

.table-glass tr:last-child td {
    border-bottom: none;
}

.table-glass tbody tr {
    transition: background var(--transition-fast);
}

.table-glass tbody tr:hover {
    background: var(--glass-hover);
}


/* ============================================
   TOOLTIPS
   ============================================ */
[data-tooltip] {
    position: relative;
}

[data-tooltip]::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    padding: var(--space-xs) var(--space-sm);
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-inverse);
    background: var(--text-primary);
    border-radius: var(--radius-sm);
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-fast);
    z-index: var(--z-tooltip);
    margin-bottom: var(--space-xs);
}

[data-tooltip]:hover::after {
    opacity: 1;
    visibility: visible;
}


/* ============================================
   THEME TOGGLE BUTTON
   See ui_refactor_plan.md for sync instructions
   ============================================ */
.theme-toggle-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background: var(--glass-bg);
    backdrop-filter: var(--blur-md);
    -webkit-backdrop-filter: var(--blur-md);
    border: 2px solid rgba(255, 255, 255, 0.25);
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.2s ease;
    flex-shrink: 0;
}

.day-mode .theme-toggle-btn {
    border-color: rgba(0, 0, 0, 0.15);
}

.theme-toggle-btn svg {
    width: 22px;
    height: 22px;
    stroke: var(--text-primary);
    stroke-width: 2;
    fill: none;
}

.theme-toggle-btn .theme-icon-moon {
    fill: var(--text-primary);
    stroke: none;
}

/* Show moon in night mode (default), sun in day mode */
.theme-icon-sun { display: none; }
.theme-icon-moon { display: block; }
.day-mode .theme-icon-sun { display: block; }
.day-mode .theme-icon-moon { display: none; }

/* Responsive sizes - matches login.html (ground truth) */
@media (max-width: 768px) {
    .theme-toggle-btn {
        width: 44px;
        height: 44px;
    }

    .theme-toggle-btn svg {
        width: 20px;
        height: 20px;
    }
}

@media (max-width: 480px) {
    .theme-toggle-btn {
        width: 42px;
        height: 42px;
    }

    .theme-toggle-btn svg {
        width: 18px;
        height: 18px;
    }
}

@media (max-height: 500px) {
    .theme-toggle-btn {
        width: 40px;
        height: 40px;
    }

    .theme-toggle-btn svg {
        width: 18px;
        height: 18px;
    }
}