/* =====================================================
   AI Campus 24 Design System – Dark Theme
   ===================================================== */

:root {
    --bg:           #080A0D;
    --card:         #111418;
    --secondary:    #292D33;
    --primary:      #00F0FF;
    --primary-dark: #00C4D0;
    --label:        #F5F5F5;
    --label2:       #7F8694;
    --label3:       #4A5060;
    --separator:    #2E3238;
    --green:        #14EB8C;
    --red:          #EC4444;
    --radius-card:  14px;
    --radius-input: 10px;
    --radius-badge: 6px;
    --shadow:       0 2px 16px rgba(0,0,0,0.4);
    --glow-primary: 0 0 20px rgba(0,240,255,0.15);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Helvetica Neue", sans-serif;
    background: var(--bg);
    color: var(--label);
    font-size: 15px;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

/* =====================================================
   Navbar
   ===================================================== */

.navbar {
    background: rgba(8,10,13,0.85);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid var(--separator);
    height: 56px;
    position: sticky;
    top: 0;
    z-index: 900;
}

.navbar-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 17px;
    font-weight: 700;
    color: var(--label);
    letter-spacing: -0.3px;
    text-decoration: none;
}

.nav-brand img {
    width: 28px;
    height: 28px;
    border-radius: 6px;
}

.nav-brand span {
    color: var(--primary);
}

.nav-links {
    display: flex;
    gap: 4px;
}

.nav-link {
    color: var(--label2);
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
    padding: 6px 12px;
    border-radius: var(--radius-input);
    transition: background 0.15s, color 0.15s;
}

.nav-link:hover {
    background: var(--secondary);
    color: var(--label);
}

.nav-link.active {
    color: var(--primary);
    background: rgba(0,240,255,0.08);
}

.nav-menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 6px;
    border-radius: 8px;
    color: var(--label);
}

.nav-menu-toggle svg {
    display: block;
}

/* =====================================================
   Container & Layout
   ===================================================== */

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 28px 24px 48px;
}

h1 {
    font-size: 28px;
    font-weight: 700;
    color: var(--label);
    margin-bottom: 24px;
    letter-spacing: -0.5px;
}

h2 {
    font-size: 20px;
    font-weight: 600;
    color: var(--label);
    margin-bottom: 12px;
    letter-spacing: -0.3px;
}

/* =====================================================
   Cards
   ===================================================== */

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.card {
    background: var(--card);
    border-radius: var(--radius-card);
    padding: 20px;
    border: 1px solid var(--separator);
    box-shadow: var(--shadow);
}

/* =====================================================
   Page header
   ===================================================== */

.page-header {
    margin-bottom: 24px;
}

.page-title {
    font-size: 26px;
    font-weight: 700;
    color: var(--label);
    letter-spacing: -0.4px;
    margin-bottom: 4px;
}

.page-subtitle {
    font-size: 14px;
    color: var(--label2);
}

/* =====================================================
   Stat display
   ===================================================== */

.stat-number {
    font-size: 40px;
    font-weight: 700;
    color: var(--primary);
    line-height: 1.1;
    letter-spacing: -1px;
    margin-bottom: 2px;
    text-shadow: var(--glow-primary);
}

.stat-label {
    font-size: 13px;
    color: var(--label2);
    font-weight: 500;
    margin-bottom: 12px;
}

/* =====================================================
   Availability Slots Grid
   ===================================================== */

.slot-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    gap: 8px;
    margin-top: 8px;
}

.slot {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 8px 6px;
    border-radius: var(--radius-input);
    font-size: 13px;
    font-weight: 500;
    line-height: 1.3;
}

.slot span:first-child {
    font-size: 15px;
    font-weight: 600;
}

.slot-available {
    background: rgba(20,235,140,0.10);
    color: #14EB8C;
    border: 1px solid rgba(20,235,140,0.2);
}

.slot-full {
    background: rgba(236,68,68,0.10);
    color: #EC4444;
    border: 1px solid rgba(236,68,68,0.15);
}

/* =====================================================
   Section Header
   ===================================================== */

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
    gap: 12px;
}

.section-header h2 {
    margin-bottom: 0;
}

/* =====================================================
   Table
   ===================================================== */

.table-scroll {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    border-radius: var(--radius-card);
    border: 1px solid var(--separator);
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--card);
    min-width: 600px;
}

.data-table th,
.data-table td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--separator);
    white-space: nowrap;
}

.data-table th {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--label2);
    background: var(--card);
    position: sticky;
    top: 0;
}

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

.data-table tbody tr:hover td {
    background: var(--secondary);
}

/* =====================================================
   Badge
   ===================================================== */

.badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: var(--radius-badge);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.2px;
}

.badge-confirmed {
    background: rgba(20,235,140,0.12);
    color: #14EB8C;
    border: 1px solid rgba(20,235,140,0.2);
}

.badge-cancelled {
    background: rgba(236,68,68,0.12);
    color: #EC4444;
    border: 1px solid rgba(236,68,68,0.15);
}

/* =====================================================
   Buttons
   ===================================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    background: var(--primary);
    color: #080A0D;
    border: none;
    padding: 10px 18px;
    border-radius: var(--radius-input);
    cursor: pointer;
    font-size: 15px;
    font-weight: 700;
    font-family: inherit;
    transition: background 0.15s, transform 0.1s, box-shadow 0.15s;
    white-space: nowrap;
    text-decoration: none;
}

.btn:hover {
    background: var(--primary-dark);
    box-shadow: 0 0 16px rgba(0,240,255,0.3);
}

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

.btn-sm {
    padding: 5px 12px;
    font-size: 13px;
}

.btn-danger {
    background: var(--red);
    color: #fff;
}

.btn-danger:hover {
    background: #c93333;
    box-shadow: 0 0 16px rgba(236,68,68,0.3);
}

.btn-secondary {
    background: var(--secondary);
    color: var(--label);
    border: 1px solid var(--separator);
}

.btn-secondary:hover {
    background: #363c44;
    box-shadow: none;
}

/* =====================================================
   Forms
   ===================================================== */

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-size: 13px;
    font-weight: 600;
    color: var(--label2);
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--separator);
    border-radius: var(--radius-input);
    font-size: 15px;
    font-family: inherit;
    color: var(--label);
    background: var(--secondary);
    transition: border-color 0.15s, box-shadow 0.15s;
    appearance: none;
    -webkit-appearance: none;
}

.form-group select {
    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='%237F8694' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 10px center;
    background-color: var(--secondary);
    padding-right: 34px;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(0,240,255,0.12);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--label3);
}

.form-group small {
    display: block;
    margin-top: 4px;
    font-size: 12px;
    color: var(--label3);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

/* =====================================================
   Filters
   ===================================================== */

.filters {
    display: flex;
    gap: 12px;
    align-items: flex-end;
    margin-bottom: 20px;
    flex-wrap: wrap;
    background: var(--card);
    padding: 16px;
    border-radius: var(--radius-card);
    border: 1px solid var(--separator);
}

.filters .form-group {
    margin-bottom: 0;
    flex: 1 1 160px;
    min-width: 140px;
}

.filters .btn {
    flex-shrink: 0;
    align-self: flex-end;
}

/* =====================================================
   Modal
   ===================================================== */

.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.7);
    z-index: 1000;
    justify-content: center;
    align-items: center;
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
}

.modal-overlay.active {
    display: flex;
}

.modal {
    background: var(--card);
    border: 1px solid var(--separator);
    border-radius: 20px;
    padding: 28px;
    width: 90%;
    max-width: 540px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 24px 80px rgba(0,0,0,0.6), var(--glow-primary);
    animation: modal-in 0.25s cubic-bezier(0.34,1.56,0.64,1);
}

@keyframes modal-in {
    from { opacity: 0; transform: scale(0.92) translateY(10px); }
    to   { opacity: 1; transform: scale(1) translateY(0); }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.modal-header h2 {
    margin-bottom: 0;
}

.modal-close {
    background: var(--secondary);
    border: none;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    font-size: 18px;
    line-height: 1;
    cursor: pointer;
    color: var(--label2);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: background 0.15s;
}

.modal-close:hover {
    background: #363c44;
    color: var(--label);
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    margin-top: 24px;
    padding-top: 16px;
    border-top: 1px solid var(--separator);
}

/* =====================================================
   Settings Cards
   ===================================================== */

.settings-section {
    margin-bottom: 20px;
}

.settings-section-title {
    font-size: 13px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--label2);
    padding: 0 4px;
    margin-bottom: 8px;
}

/* =====================================================
   Messages
   ===================================================== */

.success-msg {
    color: var(--green);
    font-size: 13px;
    font-weight: 500;
    margin-top: 8px;
}

.error-msg {
    color: var(--red);
    font-size: 13px;
    font-weight: 500;
    margin-top: 8px;
    padding: 8px 12px;
    background: rgba(236,68,68,0.08);
    border: 1px solid rgba(236,68,68,0.2);
    border-radius: 8px;
}

/* =====================================================
   Login Page
   ===================================================== */

.login-wrap {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg);
    background-image: radial-gradient(ellipse at 50% 0%, rgba(0,240,255,0.06) 0%, transparent 60%);
}

.login-card {
    background: var(--card);
    border: 1px solid var(--separator);
    border-radius: var(--radius-card);
    box-shadow: var(--shadow);
    padding: 40px 36px;
    width: 100%;
    max-width: 400px;
}

.login-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 20px;
    font-weight: 700;
    color: var(--label);
    margin-bottom: 6px;
}

.login-logo img {
    width: 36px;
    height: 36px;
    border-radius: 8px;
}

.login-logo span {
    color: var(--primary);
}

.login-subtitle {
    color: var(--label2);
    font-size: 14px;
    margin-bottom: 32px;
}

.login-card input {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--separator);
    border-radius: var(--radius-input);
    font-size: 15px;
    background: var(--secondary);
    color: var(--label);
    outline: none;
    transition: border-color 0.15s, box-shadow 0.15s;
    font-family: inherit;
}

.login-card input::placeholder {
    color: var(--label3);
}

.login-card input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(0,240,255,0.12);
}

.login-card label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--label2);
    margin-bottom: 6px;
}

.login-card .form-group {
    margin-bottom: 18px;
}

.btn-login {
    width: 100%;
    padding: 12px;
    background: var(--primary);
    color: #080A0D;
    border: none;
    border-radius: var(--radius-input);
    font-size: 15px;
    font-weight: 700;
    cursor: pointer;
    margin-top: 8px;
    transition: background 0.15s, box-shadow 0.15s;
    font-family: inherit;
}

.btn-login:hover {
    background: var(--primary-dark);
    box-shadow: 0 0 20px rgba(0,240,255,0.3);
}

/* =====================================================
   Responsive – Tablet (≤1024px)
   ===================================================== */

@media (max-width: 1024px) {
    .container {
        padding: 20px 16px 40px;
    }

    .card-grid {
        grid-template-columns: 1fr;
    }
}

/* =====================================================
   Responsive – Mobile (≤640px)
   ===================================================== */

@media (max-width: 640px) {
    .navbar {
        padding: 0 16px;
    }

    .nav-brand {
        font-size: 16px;
    }

    .navbar-inner {
        padding: 0 16px;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 56px;
        left: 0;
        right: 0;
        background: rgba(8,10,13,0.97);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 12px 16px 20px;
        gap: 4px;
        border-bottom: 1px solid var(--separator);
        box-shadow: 0 8px 24px rgba(0,0,0,0.4);
    }

    .nav-links.open {
        display: flex;
    }

    .nav-link {
        padding: 12px 14px;
        font-size: 16px;
        border-radius: 12px;
    }

    .nav-menu-toggle {
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .container {
        padding: 16px 12px 40px;
    }

    h1 {
        font-size: 24px;
        margin-bottom: 16px;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .filters {
        flex-direction: column;
        gap: 10px;
    }

    .filters .form-group {
        min-width: unset;
        width: 100%;
    }

    .filters .btn {
        width: 100%;
    }

    .section-header {
        flex-wrap: wrap;
    }

    .section-header .btn {
        width: 100%;
    }

    /* Modal as Bottom Sheet */
    .modal-overlay {
        align-items: flex-end;
    }

    .modal {
        width: 100%;
        max-width: 100%;
        border-radius: 20px 20px 0 0;
        padding: 24px 20px 36px;
        max-height: 92vh;
        animation: sheet-in 0.3s cubic-bezier(0.32,0.72,0,1);
    }

    @keyframes sheet-in {
        from { transform: translateY(100%); }
        to   { transform: translateY(0); }
    }

    .modal-actions {
        flex-direction: column-reverse;
    }

    .modal-actions .btn {
        width: 100%;
    }

    .stat-number {
        font-size: 34px;
    }

    .slot-grid {
        grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
    }

    .login-card {
        border-radius: 0;
        min-height: 100vh;
        padding: 40px 24px;
        border: none;
    }
}