/* ==========================================================================
   POSH Trainer Portal - Optimized CSS Framework
   ========================================================================== */

:root {
    --primary-color: #237388;
    --primary-dark: #1a5a6b;
    --success-color: #28a745;
    --warning-color: #ffc107;
    --danger-color: #dc3545;
    --info-color: #17a2b8;
    --light-color: #f8f9fa;
    --dark-color: #343a40;
    --border-color: #dee2e6;
    --border-radius: 8px;
    --box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    --transition: all 0.2s ease;
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

/* Base Styles */
* { box-sizing: border-box; }

body,
.psb-trainer-registration,
.psb-trainer-dashboard,
.psb-trainer-profile,
.psb-trainer-bookings,
.psb-trainer-availability,
.psb-trainer-pending {
    background: var(--light-color);
    font-family: var(--font-family);
    min-height: 100vh;
    margin: 0;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ==========================================================================
   Navigation
   ========================================================================== */
.trainer-nav {
    background: #fff;
    border-radius: var(--border-radius);
    padding: 16px 24px;
    margin-bottom: 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--box-shadow);
    position: relative;
    z-index: 100;
}

.nav-brand h2 {
    color: var(--primary-color);
    margin: 0;
    font-size: 1.5rem;
    font-weight: 600;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 8px;
    margin: 0;
    padding: 0;
}

.nav-menu a {
    color: #666;
    font-weight: 500;
    padding: 12px 16px;
    border-radius: var(--border-radius);
    text-decoration: none;
    transition: var(--transition);
    position: relative;
    display: flex;
    align-items: center;
    overflow: hidden;
}
.nav-menu a:hover,
.nav-menu a.active {
    background: var(--primary-color);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(35, 115, 136, 0.3);
}
.nav-menu a.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 6px;
    height: 6px;
    background: #fff;
    border-radius: 50%;
}

/* ==========================================================================
   Forms & Inputs
   ========================================================================== */
.trainer-form,
.profile-form {
    background: #fff;
    border-radius: var(--border-radius);
    padding: 32px;
    box-shadow: var(--box-shadow);
    margin-bottom: 24px;
}
.form-section {
    margin-bottom: 32px;
}
.form-section:last-child { margin-bottom: 0; }
.form-section h3 {
    margin: 0 0 24px 0;
    color: var(--primary-color);
    border-bottom: 2px solid #e9ecef;
    padding-bottom: 12px;
    font-size: 1.25rem;
    font-weight: 600;
    position: relative;
}
.form-section h3::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 60px;
    height: 2px;
    background: var(--primary-color);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 20px;
}

.form-group { margin-bottom: 24px; }
.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--dark-color);
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid #e9ecef;
    border-radius: var(--border-radius);
    font-size: 16px;
    transition: var(--transition);
    background: #fff;
    font-family: var(--font-family);
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(35,115,136,.1);
    outline: none;
    transform: translateY(-1px);
}
.form-group input:invalid { border-color: var(--danger-color); }
.form-group small {
    color: #6c757d;
    font-size: 12px;
    margin-top: 4px;
    display: block;
}
.char-counter {
    text-align: right;
    font-size: 12px;
    color: #6c757d;
    margin-top: 4px;
}

.image-upload-area {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px;
    border: 2px dashed #e9ecef;
    border-radius: var(--border-radius);
    transition: var(--transition);
}
.image-upload-area:hover {
    border-color: var(--primary-color);
    background: rgba(35, 115, 136, 0.05);
}
.current-image {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    overflow: hidden;
    border: 4px solid #e9ecef;
    transition: var(--transition);
}
.current-image:hover {
    border-color: var(--primary-color);
    transform: scale(1.05);
}

/* Checkbox/Radio */
.checkbox-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 12px;
}
.checkbox-label {
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
    padding: 8px 12px;
    border-radius: var(--border-radius);
    transition: var(--transition);
    font-weight: normal;
}
.checkbox-label:hover {
    background: rgba(35, 115, 136, 0.05);
}
.checkbox-label input[type="checkbox"] {
    accent-color: var(--primary-color);
}
.checkmark {
    width: 20px;
    height: 20px;
    border: 2px solid #e9ecef;
    border-radius: 4px;
    position: relative;
    transition: var(--transition);
}
.checkbox-label input[type="checkbox"]:checked + .checkmark {
    background: var(--primary-color);
    border-color: var(--primary-color);
}
.checkbox-label input[type="checkbox"]:checked + .checkmark::after {
    content: '✓';
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    color: #fff;
    font-weight: bold;
    font-size: 12px;
}

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
    padding: 12px 24px;
    border: none;
    border-radius: var(--border-radius);
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
    transition: var(--transition);
    font-size: 14px;
    text-align: center;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    background: var(--primary-color);
    color: #fff;
    position: relative;
    overflow: hidden;
}
.btn-primary { background: var(--primary-color); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px);}
.btn-success { background: var(--success-color); color: #fff; }
.btn-success:hover { background: #218838; }
.btn-outline {
    background: #fff;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}
.btn-outline:hover { background: var(--primary-color); color: #fff; }
.btn-outline-danger {
    background: #fff;
    color: var(--danger-color);
    border: 2px solid var(--danger-color);
}
.btn-outline-danger:hover { background: var(--danger-color); color: #fff; }
.btn:disabled { opacity: 0.6; cursor: not-allowed; }
.btn-sm { padding: 8px 16px; font-size: 12px; }
.btn-full { width: 100%; padding: 16px; font-size: 16px; }

@keyframes spin { to { transform: rotate(360deg); } }
.btn-loading::after {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    top: 50%; left: 50%;
    border: 2px solid transparent;
    border-top-color: currentColor;
    border-radius: 50%;
    transform: translate(-50%, -50%);
    animation: spin 1s linear infinite;
}

/* ==========================================================================
   Dashboard & Cards
   ========================================================================== */
.welcome-section {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: #fff;
    border-radius: var(--border-radius);
    padding: 32px;
    margin-bottom: 32px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 8px 25px rgba(35, 115, 136, 0.2);
    position: relative;
    overflow: hidden;
}
.welcome-content h1 { margin: 0 0 8px 0; font-size: 2rem; font-weight: 700; }
.alert {
    background: rgba(255,255,255,0.15);
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: var(--border-radius);
    padding: 12px 16px;
    margin: 16px 0;
    backdrop-filter: blur(10px);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 24px;
    margin-bottom: 32px;
}
.stat-card {
    background: #fff;
    padding: 32px 24px;
    border-radius: var(--border-radius);
    text-align: center;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}
.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}
.stat-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--success-color));
}
.stat-icon { font-size: 3rem; margin-bottom: 16px; opacity: 0.8; }
.stat-content h3 { margin: 0 0 8px 0; font-size: 2.5rem; color: var(--primary-color); font-weight: 700; }
.stat-content p { margin: 0; color: #6c757d; font-weight: 500; text-transform: uppercase; font-size: 14px; }

.bookings-grid { display: grid; gap: 20px; }
.booking-card {
    background: #fff;
    border-radius: var(--border-radius);
    padding: 24px;
    box-shadow: var(--box-shadow);
    border-left: 4px solid #e9ecef;
    transition: var(--transition);
    position: relative;
}
.booking-card.pending { border-left-color: var(--warning-color); }
.booking-card.confirmed,
.booking-card.processing { border-left-color: var(--success-color); }
.booking-card.completed { border-left-color: var(--info-color); }
.booking-header { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 16px; }
.booking-date { text-align: center; }
.booking-date .date { font-weight: 700; color: var(--primary-color); font-size: 1.1rem; }
.booking-date .time { color: #6c757d; font-size: 14px; margin-top: 4px; }
.status-badge {
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.status-pending { background: #fff3cd; color: #856404; }
.status-processing { background: #d1ecf1; color: #0c5460; }
.status-completed { background: #d4edda; color: #155724; }

/* ==========================================================================
   Responsive Design
   ========================================================================== */
@media (max-width: 1024px) {
    .container { max-width: 100%; padding: 0 16px; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .form-row { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
    .trainer-nav { flex-direction: column; gap: 16px; padding: 16px; }
    .nav-menu { width: 100%; flex-direction: column; gap: 8px; display: none; }
    .nav-menu.active { display: flex; }
    .welcome-section { flex-direction: column; text-align: center; gap: 16px; padding: 24px; }
    .stats-grid { grid-template-columns: 1fr; }
    .trainer-form, .profile-form { padding: 20px; }
    .booking-header { flex-direction: column; gap: 12px; }
    .checkbox-grid { grid-template-columns: 1fr; }
}
@media (max-width: 480px) {
    .btn, .btn-full { width: 100%; }
    .form-actions { flex-direction: column; gap: 12px; }
    .image-upload-area { flex-direction: column; text-align: center; }
}

/* ==========================================================================
   Utility Classes
   ========================================================================== */
.text-center { text-align: center !important; }
.text-left { text-align: left !important; }
.text-right { text-align: right !important; }
.mt-1 { margin-top: 0.25rem !important; }
.mt-2 { margin-top: 0.5rem !important; }
.mt-3 { margin-top: 1rem !important; }
.mt-4 { margin-top: 1.5rem !important; }
.mb-1 { margin-bottom: 0.25rem !important; }
.mb-2 { margin-bottom: 0.5rem !important; }
.mb-3 { margin-bottom: 1rem !important; }
.mb-4 { margin-bottom: 1.5rem !important; }
.p-1 { padding: 0.25rem !important; }
.p-2 { padding: 0.5rem !important; }
.p-3 { padding: 1rem !important; }
.p-4 { padding: 1.5rem !important; }
.d-none { display: none !important; }
.d-block { display: block !important; }
.d-flex { display: flex !important; }
.d-grid { display: grid !important; }
.gap-1 { gap: 0.25rem !important; }
.gap-2 { gap: 0.5rem !important; }
.gap-3 { gap: 1rem !important; }
.gap-4 { gap: 1.5rem !important; }

/* ==========================================================================
   Animations & Overlays
   ========================================================================== */
.loading-overlay {
    position: fixed;
    top: 0; left: 0; width: 100vw; height: 100vh;
    background: rgba(0,0,0,0.5);
    display: flex; align-items: center; justify-content: center;
    z-index: 9999;
}
.loading-spinner {
    width: 50px; height: 50px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}
.fade-in { animation: fadeIn 0.3s ease-in; }
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px);}
    to { opacity: 1; transform: translateY(0);}
}
.slide-up { animation: slideUp 0.3s ease-out; }
@keyframes slideUp {
    from { transform: translateY(100%); opacity: 0;}
    to { transform: translateY(0); opacity: 1;}
}