/* === VARIABLE & GLOBAL SETUP === */
:root {
    --bg-color: #0a0f1d;
    --primary-glow: #00f2fe;
    --secondary-glow: #a450e6;
    --text-color: #ffffff;
    --text-muted: #a0a8b2;
    --glass-bg: rgba(20, 28, 48, 0.6);
    --glass-border: rgba(255, 255, 255, 0.1);
    --success-color: #00ffab;
    --danger-color: #ff4d4d;
    --font-primary: 'Orbitron', sans-serif;
    --font-secondary: 'Roboto', sans-serif;
}

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

body {
    font-family: var(--font-secondary);
    background-color: var(--bg-color);
    color: var(--text-color);
    background-image: 
        radial-gradient(circle at 15% 50%, var(--primary-glow), transparent 25%),
        radial-gradient(circle at 85% 30%, var(--secondary-glow), transparent 25%);
    background-attachment: fixed;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    overflow: hidden;
}

#app-container {
    width: 100%;
    height: 100vh;
    position: relative;
}

.page {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.5s ease-in-out, visibility 0.5s;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.page.active {
    opacity: 1;
    visibility: visible;
}

/* === GLASSMORPHISM CARD === */
.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 40px;
    width: 100%;
    max-width: 450px;
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
    text-align: center;
    animation: fadeIn 0.8s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* === LOGIN PAGE STYLES === */
.app-title {
    font-family: var(--font-primary);
    font-size: 2.5rem;
    margin-bottom: 5px;
    letter-spacing: 2px;
}

.title-highlight {
    color: var(--primary-glow);
    text-shadow: 0 0 10px var(--primary-glow);
}

.app-subtitle {
    color: var(--text-muted);
    margin-bottom: 30px;
    font-weight: 300;
}

.input-group {
    position: relative;
    margin-bottom: 25px;
}

.input-group input, .input-group select {
    width: 100%;
    padding: 15px 20px;
    background: transparent;
    border: 1px solid var(--glass-border);
    border-radius: 10px;
    color: var(--text-color);
    font-size: 1rem;
    transition: border-color 0.3s, box-shadow 0.3s;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
}

.input-group select {
    cursor: pointer;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3e%3cpath fill='none' stroke='%23a0a8b2' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M2 5l6 6 6-6'/%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    background-size: 1em;
}

.input-group label {
    position: absolute;
    top: 15px;
    left: 20px;
    color: var(--text-muted);
    pointer-events: none;
    transition: all 0.3s ease;
}

.input-group input:focus + label,
.input-group input:valid + label,
.input-group select:valid + label {
    top: -10px;
    left: 15px;
    font-size: 0.8rem;
    color: var(--primary-glow);
    background: var(--bg-color);
    padding: 0 5px;
}

.input-group select + .select-label {
    background: var(--bg-color);
    padding: 0 5px;
    top: -10px;
    left: 15px;
    font-size: 0.8rem;
}

.input-group input:focus, .input-group select:focus {
    outline: none;
    border-color: var(--primary-glow);
    box-shadow: 0 0 15px rgba(0, 242, 254, 0.5);
}

#login-button {
    width: 100%;
    padding: 15px;
    border: none;
    border-radius: 10px;
    background: linear-gradient(90deg, var(--primary-glow), var(--secondary-glow));
    color: var(--bg-color);
    font-family: var(--font-primary);
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.3s;
    position: relative;
    overflow: hidden;
}

#login-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(164, 80, 230, 0.4);
}

#login-button .loader {
    border: 3px solid rgba(10, 15, 29, 0.3);
    border-radius: 50%;
    border-top: 3px solid var(--bg-color);
    width: 20px;
    height: 20px;
    animation: spin 1s linear infinite;
    margin: 0 auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* === EXAM PAGE STYLES === */
#exam-page {
    flex-direction: column;
    justify-content: flex-start;
    padding: 0;
}

.exam-header {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 30px;
    background: var(--glass-bg);
    border-bottom: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 10;
}

.student-info { display: flex; flex-direction: column; }
.student-info strong { font-family: var(--font-primary); }
.student-info span { font-size: 0.9rem; color: var(--text-muted); }
.exam-title { font-family: var(--font-primary); font-size: 1.5rem; }
.timer-container { font-family: var(--font-primary); font-size: 1.5rem; font-weight: 700; }
.timer-container.warning { color: var(--danger-color); animation: pulse 1s infinite; }

@keyframes pulse {
    0% { text-shadow: 0 0 5px var(--danger-color); }
    50% { text-shadow: 0 0 20px var(--danger-color); }
    100% { text-shadow: 0 0 5px var(--danger-color); }
}

.exam-workspace {
    display: flex;
    width: 100%;
    height: calc(100vh - 70px); /* Adjust based on header height */
}

.question-panel {
    flex-grow: 1;
    padding: 30px;
    overflow-y: auto;
}

.question-item {
    margin-bottom: 40px;
    animation: fadeIn 0.5s;
}

.question-text {
    font-size: 1.2rem;
    line-height: 1.6;
    margin-bottom: 20px;
}

.question-text[dir="rtl"] {
    font-size: 1.5rem; /* Larger for Arabic */
}

.options-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.option-item label {
    display: flex;
    align-items: center;
    padding: 15px 20px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s;
}

.option-item label:hover {
    background: var(--glass-bg);
    border-color: var(--primary-glow);
}

.option-item input[type="radio"] {
    display: none;
}

.option-item input[type="radio"]:checked + label {
    background: var(--primary-glow);
    color: var(--bg-color);
    font-weight: 700;
    border-color: var(--primary-glow);
    box-shadow: 0 0 15px rgba(0, 242, 254, 0.5);
}

.option-key {
    font-family: var(--font-primary);
    margin-right: 15px;
    font-weight: 700;
}

.navigation-panel {
    width: 300px;
    background: var(--glass-bg);
    border-left: 1px solid var(--glass-border);
    padding: 20px;
    display: flex;
    flex-direction: column;
    overflow-y: auto;
}

.nav-header {
    font-family: var(--font-primary);
    font-size: 1.2rem;
    text-align: center;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--glass-border);
}

.question-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(45px, 1fr));
    gap: 10px;
    flex-grow: 1;
}

.nav-button {
    width: 45px;
    height: 45px;
    border: 1px solid var(--glass-border);
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-muted);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s;
    font-family: var(--font-primary);
}

.nav-button:hover {
    background: var(--glass-bg);
    border-color: var(--primary-glow);
    color: var(--text-color);
}

.nav-button.answered {
    background: var(--success-color);
    border-color: var(--success-color);
    color: var(--bg-color);
    font-weight: 700;
    text-shadow: none;
    box-shadow: 0 0 10px var(--success-color);
}

.finish-button {
    margin-top: 20px;
    padding: 15px;
    border: none;
    border-radius: 10px;
    background: var(--danger-color);
    color: var(--text-color);
    font-family: var(--font-primary);
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.3s;
}

.finish-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(255, 77, 77, 0.4);
}

/* === RESULTS PAGE (CERTIFICATE) === */
#results-page {
    background: var(--bg-color);
}

.certificate-card {
    width: 100%;
    max-width: 800px;
    aspect-ratio: 1.414 / 1; /* A4-like ratio */
    background: var(--bg-color);
    border-radius: 15px;
    padding: 10px;
    background-image: 
        linear-gradient(45deg, rgba(164, 80, 230, 0.2) 0%, transparent 50%),
        linear-gradient(-45deg, rgba(0, 242, 254, 0.2) 0%, transparent 50%);
    box-shadow: 0 0 50px rgba(0, 0, 0, 0.5);
    animation: fadeIn 1s;
}

.certificate-border {
    width: 100%;
    height: 100%;
    border: 2px solid var(--primary-glow);
    box-shadow: inset 0 0 15px var(--primary-glow);
    border-radius: 10px;
    padding: 40px;
    display: flex;
    flex-direction: column;
    text-align: center;
}

.certificate-header {
    margin-bottom: 30px;
}
.cert-logo {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    margin: 0 auto 15px;
    border: 2px solid var(--primary-glow);
}
.certificate-header h2 {
    font-family: var(--font-primary);
    font-size: 1.8rem;
    color: var(--primary-glow);
    letter-spacing: 1px;
}
.certificate-header p {
    color: var(--text-muted);
    font-size: 1rem;
}

.certificate-body {
    flex-grow: 1;
}
.cert-name {
    font-family: var(--font-primary);
    font-size: 2.5rem;
    margin: 20px 0;
    text-shadow: 0 0 10px var(--text-color);
}
.certificate-body p {
    font-size: 1.1rem;
    margin-bottom: 30px;
}

.score-summary {
    display: flex;
    justify-content: space-around;
    margin-top: 20px;
}
.score-item {
    display: flex;
    flex-direction: column;
}
.score-value {
    font-family: var(--font-primary);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-glow);
}
#cert-total-score {
    font-size: 4rem;
    color: var(--success-color);
    text-shadow: 0 0 15px var(--success-color);
}
.score-label {
    font-size: 0.9rem;
    color: var(--text-muted);
    text-transform: uppercase;
}

.certificate-footer {
    margin-top: 30px;
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    font-size: 0.9rem;
}
.signature p { margin-bottom: 30px; }
.signature span {
    font-family: 'Orbitron', cursive;
    color: var(--text-muted);
    border-top: 1px solid var(--glass-border);
    padding-top: 5px;
}
.qr-code img {
    filter: drop-shadow(0 0 5px var(--primary-glow));
}

/* === MODAL STYLES === */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(10, 15, 29, 0.8);
    backdrop-filter: blur(5px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    animation: fadeIn 0.3s;
}

.modal-content {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 15px;
    padding: 30px;
    width: 90%;
    max-width: 500px;
    text-align: center;
    box-shadow: 0 0 40px rgba(0, 242, 254, 0.3);
}

.modal-content h2 {
    font-family: var(--font-primary);
    color: var(--danger-color);
    margin-bottom: 15px;
}

.modal-content p {
    color: var(--text-muted);
    line-height: 1.6;
    margin-bottom: 10px;
}

.modal-content .warning-text {
    font-weight: 700;
    color: var(--danger-color);
    margin-top: 15px;
}

#close-modal-btn, #cancel-finish-btn {
    padding: 12px 30px;
    border: 1px solid var(--primary-glow);
    background: transparent;
    color: var(--primary-glow);
    border-radius: 8px;
    cursor: pointer;
    font-weight: 700;
    transition: all 0.3s;
    margin-top: 20px;
}
#close-modal-btn:hover, #cancel-finish-btn:hover {
    background: var(--primary-glow);
    color: var(--bg-color);
    box-shadow: 0 0 15px var(--primary-glow);
}

.modal-actions {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-top: 30px;
}

#confirm-submit-btn {
    padding: 12px 30px;
    border: none;
    background: var(--danger-color);
    color: var(--text-color);
    border-radius: 8px;
    cursor: pointer;
    font-weight: 700;
    transition: all 0.3s;
}

#confirm-submit-btn:disabled {
    background: #555;
    cursor: not-allowed;
    color: #999;
}

/* === RESPONSIVE DESIGN === */
@media (max-width: 768px) {
    .exam-workspace {
        flex-direction: column-reverse;
        height: calc(100vh - 60px);
    }
    .exam-header {
        padding: 10px 15px;
        height: 60px;
    }
    .exam-title { font-size: 1rem; }
    .timer-container { font-size: 1.1rem; }
    .student-info { display: none; }

    .navigation-panel {
        width: 100%;
        height: auto;
        max-height: 200px; /* Allow scroll */
        border-left: none;
        border-top: 1px solid var(--glass-border);
        flex-direction: column;
    }
    .question-grid {
        grid-template-columns: repeat(auto-fill, minmax(40px, 1fr));
        gap: 8px;
    }
    .nav-button { width: 40px; height: 40px; }
    .finish-button { display: none; } /* Move to header or somewhere else if needed */

    .question-panel {
        padding: 20px;
    }

    .certificate-card {
        aspect-ratio: auto;
        height: 95%;
    }
    .certificate-border { padding: 20px; }
    .cert-name { font-size: 1.8rem; }
    .score-summary { flex-wrap: wrap; gap: 15px; }
    .score-value { font-size: 1.8rem; }
    #cert-total-score { font-size: 2.5rem; }
    .certificate-footer { flex-direction: column; align-items: center; gap: 20px; }
}