/* ========================================
   A3M Language Club - Components
   ======================================== */

/* ========================
   Buttons
   ======================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    border-radius: var(--radius-lg);
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition-base);
    white-space: nowrap;
    text-decoration: none;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.15), transparent);
    transition: left 0.5s ease;
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 15px rgba(108, 92, 231, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(108, 92, 231, 0.45);
    color: white;
}

.btn-secondary {
    background: var(--gradient-secondary);
    color: var(--text-inverse);
    box-shadow: 0 4px 15px rgba(0, 206, 201, 0.3);
}

.btn-secondary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(0, 206, 201, 0.45);
}

.btn-accent {
    background: var(--gradient-accent);
    color: white;
}

.btn-accent:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(253, 121, 168, 0.35);
}

.btn-ghost {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--border-secondary);
}

.btn-ghost:hover {
    border-color: var(--brand-primary);
    color: var(--brand-primary-light);
    background: rgba(108, 92, 231, 0.08);
}

.btn-outline {
    background: transparent;
    color: var(--brand-primary-light);
    border: 2px solid var(--brand-primary);
}

.btn-outline:hover {
    background: var(--brand-primary);
    color: white;
}

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

.btn-danger:hover {
    background: #ff5252;
    transform: translateY(-2px);
}

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

.btn-sm {
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-xs);
}

.btn-lg {
    padding: var(--space-4) var(--space-8);
    font-size: var(--text-base);
    border-radius: var(--radius-xl);
}

.btn-xl {
    padding: var(--space-5) var(--space-10);
    font-size: var(--text-lg);
    border-radius: var(--radius-xl);
}

.btn-block {
    width: 100%;
}

.btn-icon {
    width: 40px;
    height: 40px;
    padding: 0;
    border-radius: var(--radius-lg);
}

.btn-icon.btn-sm {
    width: 32px;
    height: 32px;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

.btn-loading {
    position: relative;
    color: transparent !important;
}

.btn-loading::after {
    content: '';
    position: absolute;
    width: 18px;
    height: 18px;
    border: 2px solid rgba(255,255,255,0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

/* ========================
   Cards
   ======================== */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-secondary);
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: all var(--transition-base);
}

.card:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.card-body {
    padding: var(--space-6);
}

.card-img {
    width: 100%;
    aspect-ratio: 16/9;
    object-fit: cover;
}

.card-glass {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
}

.card-gradient {
    background: var(--gradient-dark-card);
    border: 1px solid var(--border-primary);
}

/* ========================
   Form Elements
   ======================== */
.form-group {
    margin-bottom: var(--space-5);
}

.form-label {
    display: block;
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--text-secondary);
    margin-bottom: var(--space-2);
}

.form-input {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    background: var(--bg-input);
    border: 1px solid var(--border-input);
    border-radius: var(--radius-lg);
    color: var(--text-primary);
    font-size: var(--text-base);
    transition: all var(--transition-fast);
}

.form-input:focus {
    border-color: var(--brand-primary);
    box-shadow: 0 0 0 3px rgba(108, 92, 231, 0.15);
}

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

.form-input-lg {
    padding: var(--space-4) var(--space-5);
    font-size: var(--text-lg);
    border-radius: var(--radius-xl);
}

.form-input-icon {
    position: relative;
}

.form-input-icon .form-input {
    padding-left: var(--space-12);
}

.form-input-icon .input-icon {
    position: absolute;
    left: var(--space-4);
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    width: 20px;
    height: 20px;
}

.form-textarea {
    min-height: 120px;
    resize: vertical;
}

.form-select {
    appearance: none;
    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='%237878A0' 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 12px center;
    background-size: 16px;
    padding-right: var(--space-10);
}

.form-checkbox {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    cursor: pointer;
}

.form-checkbox input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--brand-primary);
    cursor: pointer;
}

.form-error {
    color: var(--error);
    font-size: var(--text-sm);
    margin-top: var(--space-1);
}

.form-hint {
    color: var(--text-muted);
    font-size: var(--text-sm);
    margin-top: var(--space-1);
}

/* ========================
   Badges
   ======================== */
.badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-1) var(--space-3);
    font-size: var(--text-xs);
    font-weight: var(--font-semibold);
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.badge-primary {
    background: rgba(108, 92, 231, 0.15);
    color: var(--brand-primary-light);
}

.badge-success {
    background: var(--success-bg);
    color: var(--success);
}

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

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

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

.badge-japanese {
    background: rgba(255, 183, 197, 0.15);
    color: var(--sakura);
}

.badge-chinese {
    background: rgba(227, 66, 52, 0.15);
    color: var(--vermilion);
}

/* ========================
   Avatar
   ======================== */
.avatar {
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    background: var(--gradient-primary);
    color: white;
    font-weight: var(--font-bold);
    overflow: hidden;
    flex-shrink: 0;
}

.avatar-sm { width: 32px; height: 32px; font-size: var(--text-xs); }
.avatar-md { width: 40px; height: 40px; font-size: var(--text-sm); }
.avatar-lg { width: 56px; height: 56px; font-size: var(--text-lg); }
.avatar-xl { width: 80px; height: 80px; font-size: var(--text-2xl); }
.avatar-2xl { width: 120px; height: 120px; font-size: var(--text-4xl); }

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

/* ========================
   Progress Bar
   ======================== */
.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    border-radius: var(--radius-full);
    background: var(--gradient-primary);
    transition: width 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.progress-fill.success { background: var(--gradient-secondary); }
.progress-fill.accent { background: var(--gradient-accent); }

/* ========================
   Tags
   ======================== */
.tag {
    display: inline-flex;
    align-items: center;
    padding: var(--space-1) var(--space-3);
    font-size: var(--text-xs);
    font-weight: var(--font-medium);
    color: var(--text-secondary);
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    border: 1px solid var(--border-secondary);
}

/* ========================
   Tabs
   ======================== */
.tabs {
    display: flex;
    gap: var(--space-1);
    background: var(--bg-secondary);
    padding: var(--space-1);
    border-radius: var(--radius-xl);
    overflow-x: auto;
}

.tab {
    padding: var(--space-2) var(--space-5);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--text-tertiary);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
    border: none;
    background: transparent;
}

.tab:hover {
    color: var(--text-primary);
}

.tab.active {
    background: var(--brand-primary);
    color: white;
    box-shadow: var(--shadow-md);
}

/* ========================
   Modal
   ======================== */
.modal-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    z-index: var(--z-modal-backdrop);
    opacity: 0;
    transition: opacity var(--transition-base);
    display: none;
}

.modal-backdrop.active {
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 1;
}

.modal {
    background: var(--bg-modal);
    border: 1px solid var(--border-secondary);
    border-radius: var(--radius-2xl);
    padding: var(--space-8);
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    z-index: var(--z-modal);
    transform: scale(0.95) translateY(10px);
    transition: transform var(--transition-spring);
}

.modal-backdrop.active .modal {
    transform: scale(1) translateY(0);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-6);
}

.modal-close {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    cursor: pointer;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background: var(--error-bg);
    color: var(--error);
}

/* ========================
   Toast Notifications
   ======================== */
.toast-container {
    position: fixed;
    top: var(--space-6);
    right: var(--space-6);
    z-index: var(--z-toast);
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    pointer-events: none;
}

.toast {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-4) var(--space-5);
    background: var(--bg-elevated);
    border: 1px solid var(--border-secondary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    min-width: 300px;
    max-width: 450px;
    pointer-events: auto;
    animation: slideInRight 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.toast-icon {
    width: 24px;
    height: 24px;
    flex-shrink: 0;
}

.toast-content {
    flex: 1;
}

.toast-title {
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    color: var(--text-primary);
}

.toast-message {
    font-size: var(--text-xs);
    color: var(--text-secondary);
    margin-top: 2px;
}

.toast-close {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: var(--space-1);
}

.toast.success { border-left: 3px solid var(--success); }
.toast.success .toast-icon { color: var(--success); }
.toast.error { border-left: 3px solid var(--error); }
.toast.error .toast-icon { color: var(--error); }
.toast.warning { border-left: 3px solid var(--warning); }
.toast.warning .toast-icon { color: var(--warning); }
.toast.info { border-left: 3px solid var(--info); }
.toast.info .toast-icon { color: var(--info); }

.toast.removing {
    animation: slideOutRight 0.3s ease forwards;
}

/* ========================
   Loading Screen
   ======================== */
.loading-screen {
    position: fixed;
    inset: 0;
    background: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-loading);
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.loading-screen.hidden {
    opacity: 0;
    visibility: hidden;
}

.loader-content {
    text-align: center;
}

.loader-logo {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-2);
    margin-bottom: var(--space-8);
}

.loader-logo .logo-kanji {
    font-family: var(--font-japanese);
    font-size: var(--text-6xl);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: pulse 2s ease infinite;
}

.loader-logo .logo-text {
    font-size: var(--text-2xl);
    font-weight: var(--font-bold);
    color: var(--text-primary);
}

.loader-bar {
    width: 200px;
    height: 4px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin: 0 auto var(--space-4);
}

.loader-progress {
    width: 0%;
    height: 100%;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    animation: loadProgress 1.5s ease forwards;
}

.loader-text {
    font-size: var(--text-sm);
    color: var(--text-muted);
}

/* ========================
   Stats Counter
   ======================== */
.stat-card {
    text-align: center;
    padding: var(--space-6);
}

.stat-value {
    font-size: var(--text-4xl);
    font-weight: var(--font-extrabold);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: var(--space-2);
}

.stat-label {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    font-weight: var(--font-medium);
}

/* ========================
   Rating Stars
   ======================== */
.rating {
    display: flex;
    gap: 2px;
    color: var(--gold);
}

.rating .star-filled { color: var(--gold); }
.rating .star-empty { color: var(--text-muted); }

/* ========================
   Dropdown Menu
   ======================== */
.dropdown-menu {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 220px;
    background: var(--bg-elevated);
    border: 1px solid var(--border-secondary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    padding: var(--space-2);
    z-index: var(--z-dropdown);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: all var(--transition-fast);
}

.dropdown-menu.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-header {
    padding: var(--space-3) var(--space-4);
}

.dropdown-name {
    display: block;
    font-weight: var(--font-semibold);
    font-size: var(--text-sm);
    color: var(--text-primary);
}

.dropdown-role {
    font-size: var(--text-xs);
    color: var(--text-muted);
}

.dropdown-divider {
    height: 1px;
    background: var(--border-secondary);
    margin: var(--space-2) 0;
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    font-size: var(--text-sm);
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    cursor: pointer;
    border: none;
    background: none;
    width: 100%;
    text-align: left;
}

.dropdown-item:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.dropdown-item svg,
.dropdown-item i {
    width: 16px;
    height: 16px;
}

.dropdown-logout:hover {
    color: var(--error);
    background: var(--error-bg);
}

/* ========================
   Skeleton Loader
   ======================== */
.skeleton {
    background: linear-gradient(90deg, var(--bg-tertiary) 25%, var(--bg-card-hover) 50%, var(--bg-tertiary) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s ease infinite;
    border-radius: var(--radius-md);
}

.skeleton-text {
    height: 16px;
    margin-bottom: var(--space-2);
}

.skeleton-title {
    height: 24px;
    width: 60%;
    margin-bottom: var(--space-3);
}

.skeleton-avatar {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
}

.skeleton-img {
    width: 100%;
    aspect-ratio: 16/9;
}

/* ========================
   Empty State
   ======================== */
.empty-state {
    text-align: center;
    padding: var(--space-16);
}

.empty-state-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--space-4);
    color: var(--text-muted);
}

.empty-state h3 {
    font-size: var(--text-xl);
    margin-bottom: var(--space-2);
}

.empty-state p {
    max-width: 400px;
    margin: 0 auto;
}

/* ========================
   Table
   ======================== */
.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th {
    padding: var(--space-3) var(--space-4);
    text-align: left;
    font-size: var(--text-xs);
    font-weight: var(--font-semibold);
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-bottom: 1px solid var(--border-secondary);
}

.data-table td {
    padding: var(--space-4);
    font-size: var(--text-sm);
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-secondary);
}

.data-table tr:hover td {
    background: var(--bg-card-hover);
}

/* ========================
   Switch/Toggle
   ======================== */
.switch {
    position: relative;
    width: 44px;
    height: 24px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: background var(--transition-fast);
    border: none;
}

.switch::after {
    content: '';
    position: absolute;
    top: 3px;
    left: 3px;
    width: 18px;
    height: 18px;
    background: white;
    border-radius: var(--radius-full);
    transition: transform var(--transition-fast);
    box-shadow: var(--shadow-sm);
}

.switch.active {
    background: var(--brand-primary);
}

.switch.active::after {
    transform: translateX(20px);
}

/* Keyframes */
@keyframes spin {
    to { transform: rotate(360deg); }
}

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

@keyframes loadProgress {
    0% { width: 0%; }
    50% { width: 70%; }
    100% { width: 100%; }
}