/* ===================================================
   NCS CBT - Main Stylesheet
   Color Palette: Green & White
   =================================================== */

:root {
    --ncs-green: #1B6B3A;
    --ncs-green-dark: #0f4422;
    --ncs-green-light: #2E8B57;
    --ncs-green-pale: #e8f5ee;
    --ncs-green-accent: #4CAF50;
    --ncs-white: #ffffff;
    --ncs-bg: #f0f4f1;
    --ncs-text: #1a2e1f;
    --ncs-text-muted: #5a7a64;
    --ncs-border: #c5dccb;
    --ncs-shadow: 0 2px 12px rgba(27, 107, 58, 0.1);
    --ncs-shadow-lg: 0 8px 32px rgba(27, 107, 58, 0.18);
}

/* ─── BASE ─────────────────────────────────────── */
* { box-sizing: border-box; }

body { font-family: 'Segoe UI', system-ui, -apple-system, sans-serif; }

.text-ncs { color: var(--ncs-green) !important; }
.bg-ncs { background-color: var(--ncs-green) !important; }
.bg-ncs-light { background-color: var(--ncs-green-pale) !important; }

/* ─── BUTTONS ──────────────────────────────────── */
.btn-ncs-primary {
    background: linear-gradient(135deg, var(--ncs-green), var(--ncs-green-light));
    color: #fff;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    transition: all 0.2s;
    box-shadow: 0 2px 8px rgba(27, 107, 58, 0.3);
}
.btn-ncs-primary:hover {
    background: linear-gradient(135deg, var(--ncs-green-dark), var(--ncs-green));
    color: #fff;
    box-shadow: 0 4px 12px rgba(27, 107, 58, 0.4);
    transform: translateY(-1px);
}
.btn-ncs-primary:active { transform: translateY(0); }

.btn-ncs-outline {
    color: var(--ncs-green);
    border: 2px solid var(--ncs-green);
    border-radius: 8px;
    font-weight: 600;
    background: transparent;
    transition: all 0.2s;
}
.btn-ncs-outline:hover {
    background: var(--ncs-green);
    color: #fff;
    transform: translateY(-1px);
}

/* ─── NAVBAR ───────────────────────────────────── */
.ncs-navbar {
    background: linear-gradient(135deg, var(--ncs-green-dark) 0%, var(--ncs-green) 100%);
    box-shadow: 0 2px 16px rgba(0,0,0,0.2);
    padding: 0.6rem 1.5rem;
    min-height: 60px;
}
.ncs-brand {
    color: #fff !important;
    font-size: 1.3rem;
    text-decoration: none;
}
.ncs-brand:hover { color: #a8d5b5 !important; }
.brand-subtitle { color: rgba(255,255,255,0.6); font-size: 0.85rem; margin-left: 4px; }

.ncs-navbar .nav-link { color: rgba(255,255,255,0.85) !important; padding: 0.5rem 0.9rem; border-radius: 6px; transition: all 0.2s; }
.ncs-navbar .nav-link:hover, .ncs-navbar .nav-link.active { color: #fff !important; background: rgba(255,255,255,0.15); }
.ncs-navbar .navbar-toggler-icon { filter: invert(1); }
.user-dropdown { color: rgba(255,255,255,0.9) !important; }

/* ─── MAIN / FOOTER ────────────────────────────── */
.ncs-body { background: var(--ncs-bg); min-height: 100vh; display: flex; flex-direction: column; }
.ncs-main { flex: 1; padding-bottom: 2rem; }
.ncs-footer { background: var(--ncs-green-dark); color: rgba(255,255,255,0.6); padding: 1rem; margin-top: auto; }

/* ─── CARDS ────────────────────────────────────── */
.ncs-card {
    border: 1px solid var(--ncs-border);
    border-radius: 12px;
    box-shadow: var(--ncs-shadow);
    transition: box-shadow 0.2s;
}
.ncs-card:hover { box-shadow: 0 4px 20px rgba(27, 107, 58, 0.15); }
.ncs-card-header {
    background: linear-gradient(135deg, var(--ncs-green-pale), #fff);
    border-bottom: 1px solid var(--ncs-border);
    border-radius: 12px 12px 0 0 !important;
    padding: 1rem 1.25rem;
    color: var(--ncs-green-dark);
    font-weight: 600;
}

/* ─── PAGE HEADER ──────────────────────────────── */
.page-header { margin-bottom: 1.5rem; }
.page-title { font-size: 1.6rem; font-weight: 700; color: var(--ncs-green-dark); margin-bottom: 0.2rem; }

/* ─── STAT CARDS ───────────────────────────────── */
.stat-card {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.25rem 1.5rem;
    border-radius: 12px;
    box-shadow: var(--ncs-shadow);
    border: none;
    transition: transform 0.2s, box-shadow 0.2s;
}
.stat-card:hover { transform: translateY(-2px); box-shadow: var(--ncs-shadow-lg); }
.stat-icon { font-size: 2rem; opacity: 0.9; }
.stat-value { font-size: 2rem; font-weight: 800; line-height: 1; }
.stat-label { font-size: 0.82rem; font-weight: 500; opacity: 0.8; margin-top: 2px; }

.stat-green { background: linear-gradient(135deg, #1B6B3A, #2E8B57); color: #fff; }
.stat-blue { background: linear-gradient(135deg, #1565C0, #1976D2); color: #fff; }
.stat-orange { background: linear-gradient(135deg, #E65100, #F57C00); color: #fff; }
.stat-purple { background: linear-gradient(135deg, #6A1B9A, #8E24AA); color: #fff; }

/* ─── TABLE ────────────────────────────────────── */
.table thead th {
    font-size: 0.82rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--ncs-text-muted);
    background: var(--ncs-green-pale);
    border-bottom: 2px solid var(--ncs-border);
}
.table tbody tr:hover { background: rgba(27, 107, 58, 0.03); }

/* ─── OPTION BADGES ────────────────────────────── */
.option-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    font-size: 0.75rem;
    font-weight: 700;
    margin-right: 2px;
}
.option-a { background: #e3f2fd; color: #1565c0; }
.option-b { background: #f3e5f5; color: #6a1b9a; }
.option-c { background: #fff3e0; color: #e65100; }
.option-d { background: #e8f5e9; color: #1b5e20; }

/* ─── LOGIN PAGE ───────────────────────────────── */
.login-body {
    background: linear-gradient(135deg, var(--ncs-green-dark) 0%, var(--ncs-green) 60%, var(--ncs-green-light) 100%);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem 1rem;
}

.login-wrapper {
    width: 100%;
    max-width: 440px;
}

.login-card {
    background: #fff;
    border-radius: 20px;
    overflow: hidden;
    border: none;
}

.login-header {
    background: linear-gradient(135deg, var(--ncs-green-dark), var(--ncs-green-light));
    padding: 2.5rem 2rem;
    text-align: center;
    color: #fff;
}
.student-header {
    background: linear-gradient(135deg, #0d4a24, var(--ncs-green));
}

.login-logo {
    font-size: 3.5rem;
    opacity: 0.95;
    margin-bottom: 0.5rem;
}

.login-title {
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: 1px;
    margin-bottom: 0.3rem;
}

.login-subtitle {
    font-size: 0.85rem;
    opacity: 0.85;
    margin: 0;
}

.login-body-section {
    padding: 2rem;
}

.login-footer-text {
    font-size: 0.8rem;
}

/* ─── EXAM PAGE ────────────────────────────────── */
.exam-body {
    background: #f0f4f1;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.exam-topbar {
    background: linear-gradient(135deg, var(--ncs-green-dark), var(--ncs-green));
    padding: 0.7rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-shadow: 0 2px 12px rgba(0,0,0,0.2);
    position: sticky;
    top: 0;
    z-index: 100;
    min-height: 60px;
}

.exam-topbar-left, .exam-topbar-right { flex: 1; }
.exam-topbar-right { text-align: right; }
.exam-topbar-center { flex: 0 0 auto; }

.exam-logo { color: #fff; font-size: 1.1rem; font-weight: 800; }
.exam-title-bar { color: rgba(255,255,255,0.75); font-size: 0.85rem; margin-left: 12px; }

.exam-timer {
    background: rgba(255,255,255,0.15);
    border: 2px solid rgba(255,255,255,0.3);
    color: #fff;
    border-radius: 30px;
    padding: 0.4rem 1.2rem;
    font-size: 1.2rem;
    font-weight: 700;
    font-family: 'Courier New', monospace;
    min-width: 130px;
    text-align: center;
    transition: all 0.3s;
}
.exam-timer.timer-warning {
    background: rgba(255, 152, 0, 0.3);
    border-color: #ff9800;
    color: #fff3cd;
    animation: pulse 1s infinite;
}
.exam-timer.timer-danger {
    background: rgba(244, 67, 54, 0.4);
    border-color: #f44336;
    color: #ffebee;
    animation: pulse 0.5s infinite;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.04); }
    100% { transform: scale(1); }
}

/* Exam layout */
.exam-container {
    display: flex;
    flex: 1;
    gap: 0;
    height: calc(100vh - 60px);
    overflow: hidden;
}

.exam-sidebar {
    width: 220px;
    background: #fff;
    border-right: 1px solid var(--ncs-border);
    padding: 1rem;
    overflow-y: auto;
    flex-shrink: 0;
}

.sidebar-header {
    margin-bottom: 0.75rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--ncs-border);
}

.question-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 6px;
}

.q-nav-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    aspect-ratio: 1;
    border-radius: 8px;
    font-size: 0.8rem;
    font-weight: 600;
    text-decoration: none;
    background: var(--ncs-green-pale);
    color: var(--ncs-green);
    border: 2px solid transparent;
    transition: all 0.2s;
}
.q-nav-btn:hover { background: var(--ncs-green); color: #fff; }
.q-nav-btn.q-current { background: var(--ncs-green); color: #fff; border-color: var(--ncs-green-dark); }
.q-nav-btn.q-answered { background: #c8e6c9; color: var(--ncs-green-dark); border-color: var(--ncs-green-accent); }

.exam-main {
    flex: 1;
    overflow-y: auto;
    padding: 1.5rem;
    display: flex;
    align-items: flex-start;
    justify-content: center;
}

.question-card {
    background: #fff;
    border-radius: 16px;
    box-shadow: var(--ncs-shadow-lg);
    padding: 2rem;
    width: 100%;
    max-width: 750px;
}

.question-progress .progress { border-radius: 10px; }
.question-progress .progress-bar { border-radius: 10px; transition: width 0.4s ease; }

.question-text { margin-bottom: 1.5rem; }
.question-number-badge {
    display: inline-block;
    background: var(--ncs-green-pale);
    color: var(--ncs-green);
    border-radius: 8px;
    padding: 0.2rem 0.7rem;
    font-size: 0.8rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}
.question-content {
    font-size: 1.15rem;
    font-weight: 500;
    color: var(--ncs-text);
    line-height: 1.6;
    margin: 0;
}

/* Options */
.options-container { display: flex; flex-direction: column; gap: 12px; margin-bottom: 2rem; }
.option-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 1.25rem;
    border: 2px solid var(--ncs-border);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s;
    background: #fafcfb;
    user-select: none;
}
.option-item:hover { border-color: var(--ncs-green-light); background: var(--ncs-green-pale); transform: translateX(4px); }
.option-item.option-selected {
    border-color: var(--ncs-green);
    background: var(--ncs-green-pale);
    box-shadow: 0 0 0 3px rgba(27, 107, 58, 0.15);
}
.option-item.option-saving { opacity: 0.7; }
.option-radio { display: none; }
.option-letter {
    min-width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: var(--ncs-border);
    color: var(--ncs-text-muted);
    font-weight: 800;
    font-size: 0.9rem;
    transition: all 0.2s;
}
.option-selected .option-letter { background: var(--ncs-green); color: #fff; }
.option-text { flex: 1; font-size: 1rem; color: var(--ncs-text); }
.option-check { color: var(--ncs-green); font-size: 1.1rem; opacity: 0; transition: opacity 0.2s; }
.option-selected .option-check { opacity: 1; }

/* Navigation buttons */
.exam-nav-buttons {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 1.5rem;
    border-top: 1px solid var(--ncs-border);
}
.btn-exam-nav {
    background: #f5f5f5;
    color: var(--ncs-text);
    border: 1px solid var(--ncs-border);
    border-radius: 8px;
    padding: 0.5rem 1.25rem;
    font-weight: 500;
    transition: all 0.2s;
}
.btn-exam-nav:hover { background: var(--ncs-green-pale); border-color: var(--ncs-green); color: var(--ncs-green); }
.btn-submit-exam {
    background: linear-gradient(135deg, #b71c1c, #c62828);
    color: #fff;
    border: none;
    border-radius: 8px;
    padding: 0.5rem 1.5rem;
    font-weight: 700;
    transition: all 0.2s;
}
.btn-submit-exam:hover { background: linear-gradient(135deg, #c62828, #d32f2f); color: #fff; transform: scale(1.02); }
.btn-outline-danger.btn-submit-exam {
    background: transparent;
    color: #c62828;
    border: 2px solid #c62828;
}
.btn-outline-danger.btn-submit-exam:hover { background: #c62828; color: #fff; }

/* ─── COMPLETED PAGE ───────────────────────────── */
.completed-wrapper {
    min-height: 100vh;
    background: linear-gradient(135deg, var(--ncs-green-dark), var(--ncs-green-light));
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem 1rem;
}
.completed-card {
    background: #fff;
    border-radius: 20px;
    padding: 2.5rem;
    max-width: 500px;
    width: 100%;
}
.completed-icon {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    margin: 0 auto;
}
.completed-pass { background: #e8f5e9; color: var(--ncs-green); }
.completed-fail { background: #fff3e0; color: #e65100; }

.score-circle {
    width: 140px;
    height: 140px;
    border-radius: 50%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
    border: 6px solid;
}
.score-pass { border-color: var(--ncs-green); background: var(--ncs-green-pale); }
.score-fail { border-color: #ef9a9a; background: #ffebee; }
.score-value { font-size: 2.4rem; font-weight: 800; line-height: 1; }
.score-pass .score-value { color: var(--ncs-green-dark); }
.score-fail .score-value { color: #c62828; }
.score-label { font-size: 0.9rem; color: var(--ncs-text-muted); }

.result-details { text-align: left; }
.result-detail-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.6rem 0;
    border-bottom: 1px solid #f0f0f0;
    font-size: 0.95rem;
}

/* ─── VIEWER DASHBOARD ─────────────────────────── */
.timer-badge {
    display: inline-block;
    background: var(--ncs-green-pale);
    color: var(--ncs-green);
    border-radius: 6px;
    padding: 0.2rem 0.6rem;
    font-weight: 700;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
}
.timer-badge-warning { background: #fff3e0; color: #e65100; }
.timer-badge-danger { background: #ffebee; color: #c62828; animation: pulse 0.7s infinite; }

/* Row animations */
.row-flash { animation: rowFlash 0.8s ease; }
.row-new { animation: rowSlideIn 0.5s ease; }
.row-removing { animation: rowFadeOut 0.6s ease forwards; }

@keyframes rowFlash {
    0% { background: transparent; }
    30% { background: rgba(27, 107, 58, 0.12); }
    100% { background: transparent; }
}
@keyframes rowSlideIn {
    from { opacity: 0; transform: translateX(-20px); }
    to { opacity: 1; transform: translateX(0); }
}
@keyframes rowFadeOut {
    to { opacity: 0; transform: translateX(20px); }
}

/* ─── RESPONSIVE ───────────────────────────────── */
@media (max-width: 768px) {
    .exam-container { flex-direction: column; height: auto; overflow: visible; }
    .exam-sidebar {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid var(--ncs-border);
        max-height: 120px;
    }
    .question-grid { grid-template-columns: repeat(8, 1fr); }
    .exam-main { padding: 1rem; }
    .question-card { padding: 1.25rem; }
    .question-content { font-size: 1rem; }

    .exam-topbar { padding: 0.5rem 1rem; }
    .exam-timer { font-size: 1rem; padding: 0.3rem 0.8rem; min-width: 100px; }

    .login-body-section { padding: 1.5rem; }
    .stat-card { padding: 1rem; }
    .stat-value { font-size: 1.5rem; }
}

@media (max-width: 480px) {
    .question-grid { grid-template-columns: repeat(6, 1fr); }
    .option-item { padding: 0.75rem 1rem; gap: 0.75rem; }
    .completed-card { padding: 1.5rem; }
}