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

:root {
    --primary: #1a56db;
    --primary-dark: #1442a8;
    --bg: #f0f2f5;
    --card-bg: #ffffff;
    --text: #1e293b;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --error: #dc2626;
    --error-bg: #fef2f2;
    --success: #16a34a;
    --success-bg: #f0fdf4;
    --radius: 12px;
}

html {
    font-size: 16px;
}

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 24px 16px;
}

.container {
    width: 100%;
    max-width: 560px;
}

.header {
    text-align: center;
    margin-bottom: 28px;
}

.header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 6px;
}

.header p {
    color: var(--text-muted);
    font-size: 1rem;
}

.card {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08), 0 1px 3px rgba(0, 0, 0, 0.06);
    padding: 32px;
    margin-bottom: 24px;
}

.form-group {
    margin-bottom: 22px;
}

.form-group label {
    display: block;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 8px;
}

.form-group input[type="text"],
.form-group input[type="date"] {
    width: 100%;
    padding: 14px 16px;
    border: 1.5px solid var(--border);
    border-radius: 8px;
    font-size: 1.05rem;
    color: var(--text);
    background: #fff;
    transition: border-color 0.2s;
    outline: none;
    -webkit-appearance: none;
}

.form-group input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(26, 86, 219, 0.1);
}

.form-group input:read-only {
    background: #f8fafc;
    color: var(--text-muted);
    cursor: not-allowed;
}

.captcha-wrapper {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}

.captcha-wrapper img {
    border-radius: 8px;
    border: 1.5px solid var(--border);
    height: 56px;
    flex-shrink: 0;
}

.captcha-refresh {
    background: none;
    border: 1.5px solid var(--border);
    border-radius: 8px;
    width: 48px;
    height: 48px;
    cursor: pointer;
    color: var(--text-muted);
    font-size: 1.4rem;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.captcha-refresh:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: rgba(26, 86, 219, 0.04);
}

.btn-submit {
    width: 100%;
    padding: 16px;
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
    -webkit-appearance: none;
}

.btn-submit:hover {
    background: var(--primary-dark);
}

.btn-submit:active {
    transform: scale(0.98);
}

.btn-submit:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Messages */
.message {
    padding: 16px 20px;
    border-radius: 10px;
    font-size: 1rem;
    margin-bottom: 20px;
    display: none;
}

.message.error {
    background: var(--error-bg);
    color: var(--error);
    border: 1px solid #fecaca;
}

.message.success {
    background: var(--success-bg);
    color: var(--success);
    border: 1px solid #bbf7d0;
}

.message.show {
    display: block;
}

/* Results */
.results {
    display: none;
}

.results.show {
    display: block;
}

.result-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08), 0 1px 3px rgba(0, 0, 0, 0.06);
    padding: 24px;
    margin-bottom: 16px;
    border-left: 4px solid var(--primary);
}

.result-card .slot-badge {
    display: inline-block;
    background: var(--primary);
    color: #fff;
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 16px;
}

.result-card .student-name {
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text);
}

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

.result-item {
    background: #f8fafc;
    padding: 14px 16px;
    border-radius: 10px;
}

.result-item .label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 4px;
}

.result-item .value {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text);
}

.result-item.full-width {
    grid-column: 1 / -1;
}

.footer {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-top: 16px;
    padding-bottom: 24px;
}

/* Time restriction banner */
.time-banner {
    text-align: center;
    padding: 48px 24px;
}

.time-banner .icon {
    font-size: 3.5rem;
    margin-bottom: 16px;
}

.time-banner h2 {
    font-size: 1.35rem;
    margin-bottom: 10px;
}

.time-banner p {
    color: var(--text-muted);
    font-size: 1rem;
}

/* Loading spinner */
.spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2.5px solid rgba(255, 255, 255, 0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
    vertical-align: middle;
    margin-right: 8px;
}

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

/* ===== MOBILE RESPONSIVE ===== */

@media (max-width: 600px) {
    html {
        font-size: 15px;
    }

    body {
        padding: 16px 12px;
        justify-content: flex-start;
        padding-top: 32px;
    }

    .container {
        max-width: 100%;
    }

    .header {
        margin-bottom: 20px;
    }

    .header h1 {
        font-size: 1.5rem;
    }

    .card {
        padding: 24px 20px;
        border-radius: 10px;
    }

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

    .form-group input[type="text"],
    .form-group input[type="date"] {
        padding: 12px 14px;
        font-size: 1rem;
    }

    .captcha-wrapper {
        flex-wrap: nowrap;
    }

    .captcha-wrapper img {
        height: 50px;
        max-width: 60%;
    }

    .btn-submit {
        padding: 14px;
        font-size: 1.05rem;
    }

    .result-grid {
        grid-template-columns: 1fr 1fr;
        gap: 10px;
    }

    .result-card {
        padding: 20px 18px;
    }

    .result-item {
        padding: 12px;
    }

    .result-item .value {
        font-size: 1rem;
    }
}

@media (max-width: 380px) {
    html {
        font-size: 14px;
    }

    .card {
        padding: 20px 16px;
    }

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

    .captcha-wrapper img {
        height: 46px;
    }
}