/* SkillSwap - Modern Green, Yellow & White Theme */

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

:root {
    --green-primary: #16a34a;
    --green-dark: #15803d;
    --green-light: #4ade80;
    --green-bg: #f0fdf4;
    --yellow-primary: #eab308;
    --yellow-dark: #ca8a04;
    --yellow-light: #fde047;
    --yellow-bg: #fefce8;
    --teal-primary: #14b8a6;
    --teal-dark: #0d9488;
    --teal-bg: #f0fdfa;
    --white: #ffffff;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    --success: #16a34a;
    --warning: #eab308;
    --danger: #dc2626;
    --info: #0ea5e9;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--gray-900);
    background: linear-gradient(135deg, var(--green-bg) 0%, var(--teal-bg) 50%, var(--yellow-bg) 100%);
    min-height: 100vh;
}

/* Header */
header {
    background: linear-gradient(135deg, var(--green-primary) 0%, var(--teal-primary) 100%);
    color: var(--white);
    padding: 1.25rem 0;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--white);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.nav-links {
    display: flex;
    gap: 1.5rem;
    list-style: none;
    align-items: center;
}

.nav-links a {
    color: var(--white);
    text-decoration: none;
    padding: 0.625rem 1.25rem;
    border-radius: 8px;
    transition: all 0.3s ease;
    font-weight: 500;
}

.nav-links a:hover {
    background: rgba(255,255,255,0.2);
    transform: translateY(-2px);
}

.points-badge {
    background: linear-gradient(135deg, var(--yellow-primary) 0%, var(--yellow-dark) 100%);
    padding: 0.375rem 1rem;
    border-radius: 2rem;
    font-weight: 600;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2.5rem 1.5rem;
}

/* Cards */
.card {
    background: var(--white);
    border-radius: 16px;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.06);
    border: 1px solid var(--gray-200);
    transition: all 0.3s ease;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 15px rgba(0,0,0,0.1), 0 4px 6px rgba(0,0,0,0.05);
}

.card-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--green-dark);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.875rem 2rem;
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    text-align: center;
    transition: all 0.3s ease;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.btn-primary {
    background: linear-gradient(135deg, var(--green-primary) 0%, var(--teal-primary) 100%);
    color: var(--white);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--teal-primary) 0%, var(--green-primary) 100%);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(22, 163, 74, 0.3);
}

.btn-secondary {
    background: var(--gray-200);
    color: var(--gray-800);
}

.btn-secondary:hover {
    background: var(--gray-300);
    transform: translateY(-2px);
}

.btn-success {
    background: linear-gradient(135deg, var(--green-primary) 0%, var(--teal-primary) 100%);
    color: var(--white);
}

.btn-success:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(22, 163, 74, 0.3);
}

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

.btn-danger:hover {
    background: #dc2626;
    transform: translateY(-2px);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
}

/* Forms */
.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    margin-bottom: 0.75rem;
    font-weight: 600;
    color: var(--gray-700);
    font-size: 0.95rem;
}

.form-control {
    width: 100%;
    padding: 0.875rem 1rem;
    border: 2px solid var(--gray-300);
    border-radius: 10px;
    font-size: 1rem;
    transition: all 0.3s ease;
    background: var(--white);
}

.form-control:focus {
    outline: none;
    border-color: var(--green-primary);
    box-shadow: 0 0 0 4px rgba(16, 185, 129, 0.1);
    background: var(--green-bg);
}

/* Alerts */
.alert {
    padding: 1.25rem 1.5rem;
    border-radius: 12px;
    margin-bottom: 1.5rem;
    border-left: 4px solid;
    font-weight: 500;
}

.alert-success {
    background: var(--green-bg);
    color: var(--green-dark);
    border-color: var(--green-primary);
}

.alert-danger {
    background: #fee2e2;
    color: #991b1b;
    border-color: var(--danger);
}

.alert-info {
    background: #cffafe;
    color: #164e63;
    border-color: var(--info);
}

.alert-warning {
    background: var(--yellow-bg);
    color: #92400e;
    border-color: var(--yellow-primary);
}

/* Grid */
.row {
    display: flex;
    flex-wrap: wrap;
    margin: 0 -0.75rem;
}

.col {
    flex: 1;
    padding: 0 0.75rem;
}

.col-12 { flex: 0 0 100%; }
.col-6 { flex: 0 0 50%; }
.col-4 { flex: 0 0 33.333%; }
.col-3 { flex: 0 0 25%; }

@media (max-width: 768px) {
    .col-6, .col-4, .col-3 {
        flex: 0 0 100%;
    }
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.6);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(4px);
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--white);
    border-radius: 20px;
    padding: 2.5rem;
    max-width: 550px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 20px 25px rgba(0,0,0,0.15);
    border: 2px solid var(--green-primary);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 2px solid var(--gray-200);
}

.modal-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--green-dark);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.modal-close {
    background: var(--gray-200);
    border: none;
    font-size: 1.75rem;
    cursor: pointer;
    color: var(--gray-600);
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.modal-close:hover {
    background: var(--gray-300);
    transform: rotate(90deg);
}

.modal-footer {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 2px solid var(--gray-200);
}

/* Badge */
.badge {
    display: inline-block;
    padding: 0.375rem 1rem;
    border-radius: 1.5rem;
    font-size: 0.875rem;
    font-weight: 600;
}

.badge-primary { 
    background: linear-gradient(135deg, var(--green-primary) 0%, var(--teal-primary) 100%);
    color: var(--white);
}
.badge-success { 
    background: var(--teal-primary);
    color: var(--white);
}
.badge-danger { 
    background: var(--danger);
    color: var(--white);
}
.badge-warning { 
    background: linear-gradient(135deg, var(--yellow-primary) 0%, var(--yellow-dark) 100%);
    color: var(--white);
}

/* List */
.list-group {
    list-style: none;
}

.list-group-item {
    padding: 1.25rem;
    border-bottom: 2px solid var(--gray-200);
    transition: all 0.3s ease;
    border-radius: 8px;
    margin-bottom: 0.5rem;
}

.list-group-item:hover {
    background: var(--green-bg);
    transform: translateX(4px);
}

.list-group-item:last-child {
    border-bottom: none;
}

/* Stats Cards */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2.5rem;
}

.stat-card {
    background: var(--white);
    padding: 2rem;
    border-radius: 16px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.07);
    transition: all 0.3s ease;
    border-top: 4px solid;
}

.stat-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 10px 15px rgba(0,0,0,0.1);
}

.stat-card.primary { 
    border-top-color: var(--green-primary);
    background: linear-gradient(135deg, var(--white) 0%, var(--green-bg) 100%);
}
.stat-card.success { 
    border-top-color: var(--teal-primary);
    background: linear-gradient(135deg, var(--white) 0%, var(--teal-bg) 100%);
}
.stat-card.info { 
    border-top-color: var(--yellow-primary);
    background: linear-gradient(135deg, var(--white) 0%, var(--yellow-bg) 100%);
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 800;
    margin: 0.75rem 0;
    background: linear-gradient(135deg, var(--green-primary) 0%, var(--teal-primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    color: var(--gray-600);
    font-size: 0.95rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Loading */
.spinner {
    display: inline-block;
    width: 1.25rem;
    height: 1.25rem;
    border: 3px solid var(--gray-300);
    border-top-color: var(--green-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.hidden {
    display: none !important;
}

/* Typography */
h1 {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--green-dark);
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

h2 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--green-dark);
    margin-bottom: 1.25rem;
}

h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--green-dark);
    margin-bottom: 1rem;
}

/* Utilities */
.text-center { text-align: center; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }

/* Footer */
footer {
    background: linear-gradient(135deg, var(--green-dark) 0%, var(--green-primary) 100%);
    color: var(--white);
    padding: 2rem 0;
    margin-top: 4rem;
    text-align: center;
}

/* Input focus states */
input[type="checkbox"] {
    width: 1.25rem;
    height: 1.25rem;
    accent-color: var(--green-primary);
    cursor: pointer;
}

select.form-control {
    cursor: pointer;
}

/* Smooth transitions */
* {
    transition: background-color 0.2s ease, color 0.2s ease;
}

/* Custom scrollbar */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--gray-100);
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(135deg, var(--green-primary) 0%, var(--teal-primary) 100%);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(135deg, var(--teal-primary) 0%, var(--green-primary) 100%);
}

/* Tab Content */
.tab-content {
    display: block;
}

/* Table Styles */
table {
    width: 100%;
    border-collapse: collapse;
}

table th {
    font-weight: 600;
    color: var(--green-dark);
}

table td, table th {
    padding: 1rem;
    text-align: left;
}

table tr:hover {
    background: var(--green-bg);
}

/* Custom Notifications & Confirm Modal */
#notification-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 10px;
    pointer-events: none; /* Allow clicking through container */
}

.notification-toast {
    background: white;
    padding: 1rem 1.5rem;
    border-radius: 12px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.15);
    display: flex;
    align-items: center;
    gap: 12px;
    min-width: 300px;
    max-width: 450px;
    animation: slideInRight 0.3s ease-out forwards;
    border-left: 5px solid var(--gray-500);
    pointer-events: auto; /* Allow interaction with toast */
}

.notification-toast.success { border-left-color: var(--green-primary); }
.notification-toast.error { border-left-color: var(--danger); }
.notification-toast.warning { border-left-color: var(--yellow-primary); }
.notification-toast.info { border-left-color: var(--info); }

.notification-icon {
    font-size: 1.5rem;
}

.notification-content {
    flex: 1;
}

.notification-title {
    font-weight: 700;
    font-size: 1rem;
    margin-bottom: 0.25rem;
    color: var(--gray-900);
}

.notification-message {
    color: var(--gray-600);
    font-size: 0.9rem;
    line-height: 1.4;
}

.notification-close {
    background: none;
    border: none;
    color: var(--gray-400);
    cursor: pointer;
    font-size: 1.25rem;
    padding: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all 0.2s;
}

.notification-close:hover {
    background: var(--gray-100);
    color: var(--gray-600);
}

@keyframes slideInRight {
    from { transform: translateX(120%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

@keyframes fadeOutRight {
    from { transform: translateX(0); opacity: 1; }
    to { transform: translateX(120%); opacity: 0; }
}

.custom-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    backdrop-filter: blur(4px);
    animation: fadeIn 0.2s ease-out;
}

.custom-confirm-box {
    background: white;
    padding: 2rem;
    border-radius: 16px;
    max-width: 450px;
    width: 90%;
    box-shadow: 0 20px 40px rgba(0,0,0,0.2);
    transform: scale(0.95);
    animation: popIn 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
    border-top: 5px solid var(--green-primary);
}

.confirm-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--gray-900);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.confirm-message {
    color: var(--gray-600);
    margin-bottom: 2rem;
    font-size: 1rem;
    line-height: 1.5;
}

.confirm-actions {
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes popIn {
    to { transform: scale(1); }
}