/* ==========================================
   SIBLINK Student Portal — siswa.siblink.web.id
   Design: "Digital Classroom" — calm, structured,
   paper-like exam environment with geometric accents
   ========================================== */

:root {
    --primary: #4F46E5;
    --primary-light: #EEF2FF;
    --primary-dark: #3730A3;
    --primary-glow: rgba(79, 70, 229, 0.12);
    --success: #059669;
    --success-light: #D1FAE5;
    --warning: #D97706;
    --warning-light: #FEF3C7;
    --danger: #DC2626;
    --danger-light: #FEE2E2;
    --surface: #FFFFFF;
    --surface-raised: #FFFFFF;
    --bg: #F8F9FC;
    --bg-exam: #0F1629;
    --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;
    --radius: 14px;
    --radius-sm: 10px;
    --radius-lg: 20px;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
    --shadow: 0 2px 8px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.08), 0 2px 4px rgba(0,0,0,0.04);
    --shadow-lg: 0 12px 40px rgba(0,0,0,0.12), 0 4px 12px rgba(0,0,0,0.06);
    --font: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--gray-800);
    min-height: 100vh;
    -webkit-user-select: none;
    user-select: none;
    -webkit-font-smoothing: antialiased;
}

/* Screens */
.screen {
    display: none;
    min-height: 100vh;
}
.screen.active {
    display: flex;
    flex-direction: column;
}

/* ==========================================
   LOGIN SCREEN — Notebook-paper aesthetic
   ========================================== */
#screenLogin {
    background:
        radial-gradient(circle at 1px 1px, rgba(79, 70, 229, 0.04) 1px, transparent 0),
        linear-gradient(135deg, #F8F9FC 0%, #EEF0F8 100%);
    background-size: 24px 24px, 100% 100%;
}

.login-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 32px 24px;
    max-width: 420px;
    margin: 0 auto;
    width: 100%;
}

.login-header {
    text-align: center;
    margin-bottom: 36px;
    animation: slideDown 0.5s ease;
}

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-16px); }
    to { opacity: 1; transform: translateY(0); }
}

.logo-mark {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--primary) 0%, #6366F1 100%);
    color: white;
    font-size: 30px;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 18px;
    margin: 0 auto 18px;
    box-shadow: 0 8px 24px rgba(79, 70, 229, 0.25), 0 2px 8px rgba(79, 70, 229, 0.15);
    position: relative;
}
.logo-mark::after {
    content: '';
    position: absolute;
    inset: -3px;
    border-radius: 21px;
    background: linear-gradient(135deg, rgba(79, 70, 229, 0.2), transparent);
    z-index: -1;
}

.login-header h1 {
    font-size: 26px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 6px;
    letter-spacing: -0.5px;
}

.login-subtitle {
    font-size: 14px;
    color: var(--gray-500);
    font-weight: 400;
}

.login-form {
    width: 100%;
    background: var(--surface);
    border-radius: var(--radius-lg);
    padding: 28px 24px;
    box-shadow: var(--shadow-md);
    border: 1px solid rgba(0,0,0,0.04);
    animation: fadeUp 0.4s ease 0.1s both;
}

@keyframes fadeUp {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

.login-step {
    display: none;
}
.login-step.active {
    display: block;
    animation: stepIn 0.25s ease;
}

@keyframes stepIn {
    from { opacity: 0; transform: translateX(8px); }
    to { opacity: 1; transform: translateX(0); }
}

.step-back {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 13px;
    color: var(--primary);
    cursor: pointer;
    margin-bottom: 16px;
    font-weight: 600;
    padding: 4px 0;
    transition: opacity var(--transition);
}
.step-back::before {
    content: '\2190';
    font-size: 14px;
}
.step-back:hover {
    opacity: 0.7;
}

.form-label {
    display: block;
    font-size: 15px;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: 10px;
    letter-spacing: -0.2px;
}

.form-input {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-family: var(--font);
    background: var(--gray-50);
    transition: all var(--transition);
    outline: none;
    color: var(--gray-800);
}
.form-input:focus {
    border-color: var(--primary);
    background: white;
    box-shadow: 0 0 0 4px var(--primary-glow);
}
.form-input::placeholder {
    color: var(--gray-400);
}

.pin-input {
    text-align: center;
    font-size: 32px;
    letter-spacing: 16px;
    font-weight: 700;
    margin-bottom: 20px;
    padding: 18px 16px;
    background: white;
}

.select-list {
    margin-top: 12px;
    max-height: 300px;
    overflow-y: auto;
    border-radius: var(--radius-sm);
    border: 2px solid var(--gray-100);
    background: white;
    scrollbar-width: thin;
    scrollbar-color: var(--gray-200) transparent;
}
.select-list::-webkit-scrollbar {
    width: 6px;
}
.select-list::-webkit-scrollbar-track {
    background: transparent;
}
.select-list::-webkit-scrollbar-thumb {
    background: var(--gray-200);
    border-radius: 3px;
}

.select-item {
    padding: 14px 16px;
    cursor: pointer;
    border-bottom: 1px solid var(--gray-100);
    font-size: 14px;
    font-weight: 500;
    transition: all 0.1s;
    position: relative;
}
.select-item:last-child {
    border-bottom: none;
}
.select-item:hover {
    background: var(--primary-light);
    padding-left: 20px;
}
.select-item:active {
    background: var(--primary);
    color: white;
    transform: scale(0.99);
}
.select-item:active .select-item-subtitle {
    color: rgba(255,255,255,0.7);
}

.select-item-subtitle {
    font-size: 12px;
    color: var(--gray-400);
    margin-top: 3px;
    font-weight: 400;
}

/* ==========================================
   EXAM LIST SCREEN
   ========================================== */
#screenExamList {
    background: var(--bg);
}

.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 20px;
    background: var(--surface);
    border-bottom: 1px solid var(--gray-100);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(8px);
    background: rgba(255,255,255,0.92);
}

.header-center {
    font-weight: 600;
    font-size: 14px;
    color: var(--gray-800);
}

.btn-icon {
    background: none;
    border: 1.5px solid var(--gray-200);
    padding: 7px 14px;
    border-radius: 8px;
    font-size: 13px;
    cursor: pointer;
    font-family: var(--font);
    font-weight: 500;
    color: var(--gray-600);
    transition: all var(--transition);
}
.btn-icon:hover {
    background: var(--gray-50);
    border-color: var(--gray-300);
}

.content-area {
    padding: 28px 20px;
    max-width: 640px;
    margin: 0 auto;
    width: 100%;
    animation: fadeUp 0.3s ease;
}

.section-title {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--gray-900);
    letter-spacing: -0.4px;
}

.exam-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.exam-card {
    background: var(--surface);
    border: 1.5px solid var(--gray-100);
    border-radius: var(--radius);
    padding: 18px 20px;
    cursor: pointer;
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
}
.exam-card::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--primary);
    opacity: 0;
    transition: opacity var(--transition);
}
.exam-card:hover {
    border-color: rgba(79, 70, 229, 0.3);
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}
.exam-card:hover::before {
    opacity: 1;
}
.exam-card:active {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

.exam-card-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 6px;
}

.exam-card-meta {
    display: flex;
    gap: 16px;
    font-size: 12px;
    color: var(--gray-500);
    font-weight: 400;
}

.exam-card-badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 6px;
    font-size: 11px;
    font-weight: 600;
    margin-top: 10px;
    letter-spacing: 0.2px;
}
.badge-available {
    background: var(--success-light);
    color: var(--success);
}
.badge-done {
    background: var(--gray-100);
    color: var(--gray-500);
}
.badge-module {
    background: var(--primary-light);
    color: var(--primary);
    margin-right: 6px;
}

.empty-state {
    text-align: center;
    padding: 80px 20px;
    color: var(--gray-400);
    font-size: 14px;
}
.empty-state::before {
    content: '';
    display: block;
    width: 48px;
    height: 48px;
    margin: 0 auto 16px;
    background:
        radial-gradient(circle at 1px 1px, var(--gray-200) 1px, transparent 0);
    background-size: 8px 8px;
    border-radius: 50%;
    opacity: 0.6;
}

/* ==========================================
   EXAM ROOM — Dark, focused environment
   ========================================== */
#screenExamRoom {
    background: var(--bg);
    -webkit-user-select: none;
    user-select: none;
}

.exam-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 24px;
    background: var(--bg-exam);
    color: white;
    position: sticky;
    top: 0;
    z-index: 200;
    box-shadow: 0 4px 20px rgba(15, 22, 41, 0.3);
}

.exam-title-text {
    font-size: 13px;
    font-weight: 500;
    opacity: 0.75;
    max-width: 220px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.exam-timer {
    font-size: 22px;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
    color: white;
    padding: 4px 12px;
    border-radius: 8px;
    background: rgba(255,255,255,0.08);
    border: 1px solid rgba(255,255,255,0.1);
}
.exam-timer.warning {
    color: #FCD34D;
    background: rgba(252, 211, 77, 0.1);
    border-color: rgba(252, 211, 77, 0.2);
    animation: timerPulse 1.5s ease infinite;
}
.exam-timer.danger {
    color: #F87171;
    background: rgba(248, 113, 113, 0.1);
    border-color: rgba(248, 113, 113, 0.2);
    animation: timerPulse 0.8s ease infinite;
}

@keyframes timerPulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.8; transform: scale(1.02); }
}

.exam-header-right {
    display: flex;
    align-items: center;
    gap: 14px;
    font-size: 13px;
    color: rgba(255,255,255,0.6);
}

.btn-submit {
    background: var(--primary);
    color: white;
    border: none;
    padding: 9px 18px;
    border-radius: 8px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    font-family: var(--font);
    transition: all var(--transition);
    box-shadow: 0 2px 8px rgba(79, 70, 229, 0.3);
}
.btn-submit:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.4);
}

.warning-banner {
    background: linear-gradient(90deg, #FEF3C7 0%, #FDE68A 100%);
    color: #92400E;
    text-align: center;
    padding: 10px 16px;
    font-size: 13px;
    font-weight: 600;
    border-bottom: 1px solid #FDE68A;
    animation: bannerSlide 0.3s ease;
}

@keyframes bannerSlide {
    from { transform: translateY(-100%); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.exam-body {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 32px 24px 24px;
    max-width: 720px;
    margin: 0 auto;
    width: 100%;
}

.question-container {
    flex: 1;
    padding-bottom: 24px;
    animation: questionFade 0.2s ease;
}

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

.question-number {
    font-size: 12px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 12px;
    text-transform: uppercase;
    letter-spacing: 0.8px;
}

.question-text {
    font-size: 18px;
    font-weight: 500;
    color: var(--gray-900);
    margin-bottom: 28px;
    line-height: 1.6;
    user-select: none;
    letter-spacing: -0.2px;
}

.options-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.option-item {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    padding: 16px 18px;
    background: var(--surface);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition);
    font-size: 15px;
    line-height: 1.5;
    position: relative;
}
.option-item:hover {
    border-color: rgba(79, 70, 229, 0.4);
    background: var(--primary-light);
    transform: translateX(2px);
}
.option-item.selected {
    border-color: var(--primary);
    background: var(--primary-light);
    box-shadow: 0 0 0 4px var(--primary-glow);
}

.option-letter {
    width: 32px;
    height: 32px;
    min-width: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    background: var(--gray-100);
    font-weight: 700;
    font-size: 13px;
    color: var(--gray-600);
    transition: all var(--transition);
}
.option-item.selected .option-letter {
    background: var(--primary);
    color: white;
    box-shadow: 0 2px 8px rgba(79, 70, 229, 0.3);
}

.option-text {
    padding-top: 5px;
    font-weight: 450;
}

/* Question navigation dots */
.question-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    justify-content: center;
    padding: 20px 0 16px;
    border-top: 1px solid var(--gray-200);
    margin-top: 20px;
}

.q-dot {
    width: 34px;
    height: 34px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    font-size: 12px;
    font-weight: 700;
    cursor: pointer;
    border: 2px solid var(--gray-200);
    background: white;
    color: var(--gray-500);
    transition: all 0.15s;
}
.q-dot:hover {
    border-color: var(--gray-300);
    transform: scale(1.05);
}
.q-dot.current {
    border-color: var(--primary);
    background: var(--primary);
    color: white;
    box-shadow: 0 2px 8px rgba(79, 70, 229, 0.25);
}
.q-dot.answered {
    border-color: var(--success);
    background: var(--success-light);
    color: var(--success);
}

.exam-nav-buttons {
    display: flex;
    justify-content: space-between;
    padding-top: 16px;
    gap: 12px;
}

.btn-nav {
    padding: 12px 24px;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-sm);
    background: white;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    font-family: var(--font);
    color: var(--gray-600);
    transition: all var(--transition);
    flex: 1;
    text-align: center;
}
.btn-nav:hover {
    background: var(--gray-50);
    border-color: var(--gray-300);
}
.btn-nav:disabled {
    opacity: 0.35;
    cursor: not-allowed;
    transform: none;
}
.btn-nav-primary {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}
.btn-nav-primary:hover {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.25);
}

/* ==========================================
   RESULT SCREEN
   ========================================== */
#screenResult {
    background:
        radial-gradient(ellipse at top, rgba(79, 70, 229, 0.03) 0%, transparent 60%),
        var(--bg);
}

.result-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 48px 24px;
    text-align: center;
    max-width: 480px;
    margin: 0 auto;
    animation: resultReveal 0.6s ease;
}

@keyframes resultReveal {
    from { opacity: 0; transform: scale(0.95); }
    to { opacity: 1; transform: scale(1); }
}

.result-score {
    font-size: 72px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 8px;
    letter-spacing: -2px;
    line-height: 1;
}

.result-label {
    font-size: 16px;
    color: var(--gray-500);
    margin-bottom: 32px;
    font-weight: 400;
}

.result-stats {
    display: flex;
    gap: 32px;
    margin-bottom: 40px;
    padding: 24px 32px;
    background: white;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid var(--gray-100);
}

.result-stat {
    text-align: center;
}
.result-stat-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--gray-800);
    letter-spacing: -0.5px;
}
.result-stat-label {
    font-size: 12px;
    color: var(--gray-400);
    margin-top: 4px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* ==========================================
   BUTTONS
   ========================================== */
.btn-primary {
    width: 100%;
    padding: 16px 24px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    font-family: var(--font);
    transition: all var(--transition);
    box-shadow: 0 2px 8px rgba(79, 70, 229, 0.2);
}
.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(79, 70, 229, 0.3);
}
.btn-primary:active {
    transform: translateY(0);
    box-shadow: 0 1px 4px rgba(79, 70, 229, 0.2);
}
.btn-primary:disabled {
    background: var(--gray-300);
    cursor: not-allowed;
    box-shadow: none;
    transform: none;
}

.btn-secondary {
    padding: 12px 20px;
    background: white;
    color: var(--gray-700);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    font-family: var(--font);
    transition: all var(--transition);
}
.btn-secondary:hover {
    background: var(--gray-50);
    border-color: var(--gray-300);
}

/* ==========================================
   MODAL
   ========================================== */
.modal {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: modalIn 0.2s ease;
}

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

.modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(15, 22, 41, 0.6);
    backdrop-filter: blur(4px);
}

.modal-content {
    position: relative;
    background: white;
    border-radius: var(--radius-lg);
    padding: 28px;
    max-width: 400px;
    width: 90%;
    box-shadow: var(--shadow-lg);
    animation: modalContentIn 0.25s ease;
}

@keyframes modalContentIn {
    from { opacity: 0; transform: scale(0.96) translateY(8px); }
    to { opacity: 1; transform: scale(1) translateY(0); }
}

.modal-content h3 {
    font-size: 17px;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--gray-900);
}

.modal-content p {
    font-size: 14px;
    color: var(--gray-600);
    margin-bottom: 24px;
    line-height: 1.6;
}

.modal-actions {
    display: flex;
    gap: 10px;
    justify-content: flex-end;
}
.modal-actions .btn-primary {
    width: auto;
    padding: 12px 24px;
}

/* ==========================================
   LOADING
   ========================================== */
.loading-spinner {
    display: inline-block;
    width: 22px;
    height: 22px;
    border: 2.5px solid var(--gray-200);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
}

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

/* ==========================================
   RESPONSIVE
   ========================================== */
@media (max-width: 600px) {
    .login-container {
        padding: 24px 16px;
    }
    .login-form {
        padding: 24px 20px;
        border-radius: var(--radius);
    }
    .exam-header {
        padding: 10px 14px;
    }
    .exam-title-text {
        max-width: 100px;
        font-size: 12px;
    }
    .exam-timer {
        font-size: 18px;
        padding: 3px 8px;
    }
    .exam-body {
        padding: 20px 16px 16px;
    }
    .question-text {
        font-size: 16px;
        margin-bottom: 20px;
    }
    .option-item {
        padding: 14px;
        font-size: 14px;
        gap: 12px;
    }
    .option-letter {
        width: 28px;
        height: 28px;
        min-width: 28px;
        font-size: 12px;
    }
    .q-dot {
        width: 30px;
        height: 30px;
        font-size: 11px;
    }
    .result-score {
        font-size: 56px;
    }
    .result-stats {
        gap: 20px;
        padding: 20px 24px;
    }
    .btn-nav {
        padding: 11px 16px;
        font-size: 13px;
    }
}

@media (min-width: 768px) {
    .exam-body {
        padding: 40px 32px 32px;
    }
    .question-text {
        font-size: 19px;
    }
    .option-item {
        padding: 18px 20px;
    }
}

/* ==========================================
   EXAM MODE — Text selection disabled
   ========================================== */
#screenExamRoom .question-text,
#screenExamRoom .option-text {
    -webkit-user-select: none;
    user-select: none;
}

/* ==========================================
   SCROLLBAR — Subtle, thin
   ========================================== */
::-webkit-scrollbar {
    width: 6px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: var(--gray-200);
    border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--gray-300);
}