:root {
    /* Financial Dark Mode Palette - Premium Refresh */
    --bg-dark: #0f1115;
    /* Sligthly blue-ish dark */
    --bg-panel: #181b21;
    --bg-hover: #232730;
    --primary-green: #00d65b;
    /* Brighter, more neon */
    --accent-green: #69F0AE;
    --text-white: #ffffff;
    --text-muted: #94a3b8;
    --danger-red: #ff4d4d;
    --border-color: #2d3748;

    --font-primary: 'Inter', sans-serif;
    --transition-speed: 0.25s;
    --shadow-soft: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.15);
    --shadow-glow: 0 0 15px rgba(0, 214, 91, 0.2);
}

[data-theme="western"] {
    --bg-dark: #3e2723;
    --bg-panel: rgba(78, 52, 46, 0.9);
    --bg-hover: rgba(93, 64, 55, 0.9);
    --primary-green: #ffb300;
    --accent-green: #ff8f00;
    --text-white: #fff3e0;
    --text-muted: #bcaaa4;
    --danger-red: #d32f2f;
    --border-color: #795548;
    --shadow-glow: 0 0 15px rgba(255, 179, 0, 0.2);
    --bg-image: url('../img/themes/western.png');
}

[data-theme="colourful"] {
    --bg-dark: #fce4ec;
    --bg-panel: rgba(248, 187, 208, 0.85);
    --bg-hover: rgba(244, 143, 177, 0.9);
    --primary-green: #ab47bc;
    --accent-green: #8e24aa;
    --text-white: #4a148c;
    --text-muted: #6a1b9a;
    --danger-red: #d50000;
    --border-color: #f06292;
    --shadow-glow: 0 0 15px rgba(171, 71, 188, 0.3);
    --bg-image: url('../img/themes/colourful.png');
}

[data-theme="white"] {
    --bg-dark: #ffffff;
    --bg-panel: rgba(245, 245, 245, 0.9);
    --bg-hover: rgba(224, 224, 224, 0.9);
    --primary-green: #1976d2;
    --accent-green: #1565c0;
    --text-white: #212121;
    --text-muted: #757575;
    --danger-red: #d32f2f;
    --border-color: #e0e0e0;
    --shadow-glow: 0 0 15px rgba(25, 118, 210, 0.15);
    --bg-image: url('../img/themes/white.png');
}

[data-theme="neon"] {
    --bg-dark: #000000;
    --bg-panel: rgba(17, 17, 17, 0.85);
    --bg-hover: rgba(34, 34, 34, 0.9);
    --primary-green: #00e5ff;
    --accent-green: #d500f9;
    --text-white: #ffffff;
    --text-muted: #aaaaaa;
    --danger-red: #ff1744;
    --border-color: #333333;
    --shadow-glow: 0 0 20px rgba(0, 229, 255, 0.5);
    --bg-image: url('../img/themes/neon.png');
}

[data-theme="nature"] {
    --bg-dark: #1b5e20;
    --bg-panel: rgba(46, 125, 50, 0.9);
    --bg-hover: rgba(56, 142, 60, 0.9);
    --primary-green: #cddc39;
    --accent-green: #dce775;
    --text-white: #ffffff;
    --text-muted: #c8e6c9;
    --danger-red: #ff5252;
    --border-color: #4caf50;
    --shadow-glow: 0 0 15px rgba(205, 220, 57, 0.2);
    --bg-image: url('../img/themes/nature.png');
}

[data-theme="beach"] {
    --bg-dark: #fff8e1;
    --bg-panel: rgba(255, 236, 179, 0.85);
    --bg-hover: rgba(255, 224, 130, 0.9);
    --primary-green: #0288d1;
    --accent-green: #03a9f4;
    --text-white: #01579b;
    --text-muted: #0277bd;
    --danger-red: #e64a19;
    --border-color: #ffd54f;
    --shadow-glow: 0 0 15px rgba(2, 136, 209, 0.2);
    --bg-image: url('../img/themes/beach.png');
}

[data-theme="sunset"] {
    --bg-dark: #2c0b1f;
    --bg-panel: rgba(69, 10, 41, 0.85);
    --bg-hover: rgba(94, 16, 56, 0.9);
    --primary-green: #ff7e67;
    --accent-green: #ff5e62;
    --text-white: #ffeadd;
    --text-muted: #ff9a8b;
    --danger-red: #d32f2f;
    --border-color: #92224d;
    --shadow-glow: 0 0 20px rgba(255, 94, 98, 0.4);
    --bg-image: url('../img/themes/sunset.png');
}

[data-theme="cafe"] {
    --bg-dark: #3e2723;
    --bg-panel: rgba(78, 52, 46, 0.85);
    --bg-hover: rgba(109, 76, 65, 0.9);
    --primary-green: #d7ccc8;
    --accent-green: #bcaaa4;
    --text-white: #efebe9;
    --text-muted: #a1887f;
    --danger-red: #d32f2f;
    --border-color: #5d4037;
    --shadow-glow: 0 0 15px rgba(215, 204, 200, 0.2);
    --bg-image: url('../img/themes/cafe.png');
}

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

body {
    font-family: var(--font-primary);
    background-color: var(--bg-dark);
    background-image: var(--bg-image, none);
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    background-repeat: no-repeat;
    color: var(--text-white);
    height: 100vh;
    overflow: hidden;
    /* App-like feel */
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

input,
textarea {
    -webkit-user-select: text;
    -moz-user-select: text;
    -ms-user-select: text;
    user-select: text;
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-dark);
}

::-webkit-scrollbar-thumb {
    background: #334155;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #475569;
}

.app-container {
    display: flex;
    height: 100%;
}

/* Sidebar */
.sidebar {
    width: 260px;
    background-color: var(--bg-panel);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    padding: 24px 0;
    box-shadow: 2px 0 10px rgba(0, 0, 0, 0.2);
    z-index: 10;
}

.logo-area {
    padding: 0 25px 30px;
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--primary-green);
    display: flex;
    align-items: center;
    gap: 12px;
    letter-spacing: 0.5px;
    text-shadow: var(--shadow-glow);
}

.nav-links {
    list-style: none;
    /* flex: 1; Removed to fix gap */
    overflow-y: auto;
}

#week-nav-container {
    flex: 1;
}

.nav-item {
    margin-bottom: 4px;
}

.nav-item a {
    display: flex;
    align-items: center;
    padding: 12px 25px;
    color: var(--text-muted);
    text-decoration: none;
    transition: all var(--transition-speed);
    font-size: 0.95rem;
    border-left: 3px solid transparent;
    font-weight: 500;
}

.nav-item a:hover {
    background-color: var(--bg-hover);
    color: var(--text-white);
}

.nav-item.active a {
    background-color: rgba(0, 214, 91, 0.08);
    color: var(--primary-green);
    border-left-color: var(--primary-green);
}

.nav-item i {
    width: 25px;
    text-align: center;
    margin-right: 10px;
    font-size: 1.1em;
}

/* Submenu for Days */
.submenu {
    list-style: none;
    background-color: rgba(0, 0, 0, 0.2);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.nav-item.open .submenu {
    max-height: 300px;
}

.submenu li a {
    padding-left: 60px;
    font-size: 0.9rem;
    opacity: 0.8;
    border-left: none;
}

.submenu li a:hover {
    opacity: 1;
    background-color: rgba(255, 255, 255, 0.03);
    color: var(--text-white);
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    background-color: transparent;
    position: relative;
}

.top-bar {
    height: 70px;
    padding: 0 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    background-color: var(--bg-panel);
    /* or transparent with blur */
    backdrop-filter: blur(10px);
}

.breadcrumbs {
    color: var(--text-muted);
    font-size: 0.95rem;
    font-weight: 500;
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 15px;
    font-size: 0.9rem;
    font-weight: 500;
}

.avatar {
    width: 38px;
    height: 38px;
    background-color: var(--bg-panel);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border-color);
    color: var(--primary-green);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}

.content-view {
    flex: 1;
    overflow-y: auto;
    padding: 40px;
    scroll-behavior: smooth;

    /* Position content lower (approx 15vh down visual weight) */
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    padding-top: 15vh;
}

/* Dashboard & Teacher Dashboard Styles */
.dashboard-container {
    padding: 0;
    /* Handled by content-view padding */
    max-width: 1600px;
    margin: 0 auto;
}

.stat-card {
    background-color: var(--bg-panel);
    border: 1px solid var(--border-color);
    padding: 30px;
    border-radius: 16px;
    display: inline-block;
    margin-bottom: 40px;
    box-shadow: var(--shadow-soft);
    min-width: 250px;
}

.stat-title {
    color: var(--text-muted);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 1.2px;
    margin-bottom: 12px;
    font-weight: 600;
}

.stat-value {
    font-size: 3.5rem;
    font-weight: 800;
    color: var(--primary-green);
    line-height: 1;
    text-shadow: 0 0 20px rgba(0, 214, 91, 0.15);
}

/* Data Tables */
.data-table-wrapper {
    background-color: var(--bg-panel);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    overflow: hidden;
    /* Rounded corners for table */
    margin-bottom: 40px;
    box-shadow: var(--shadow-soft);
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.95rem;
}

th,
td {
    padding: 18px 24px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

th {
    background-color: #1f2329;
    color: var(--text-muted);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.8rem;
    letter-spacing: 0.5px;
    cursor: pointer;
    user-select: none;
}

th:hover {
    color: var(--text-white);
    background-color: #252a33;
}

tr:last-child td {
    border-bottom: none;
}

tr:hover {
    background-color: var(--bg-hover);
}

td {
    color: var(--text-white);
}

/* Badges & Matrix */
.score-badge {
    display: inline-block;
    padding: 6px 14px;
    border-radius: 20px;
    font-weight: 700;
    font-size: 0.85rem;
    min-width: 80px;
    text-align: center;
}

.score-high {
    background-color: rgba(0, 214, 91, 0.15);
    color: var(--primary-green);
    border: 1px solid rgba(0, 214, 91, 0.3);
}

.score-med {
    background-color: rgba(255, 193, 7, 0.15);
    color: #FFC107;
    border: 1px solid rgba(255, 193, 7, 0.3);
}

.score-low {
    background-color: rgba(255, 82, 82, 0.15);
    color: var(--danger-red);
    border: 1px solid rgba(255, 82, 82, 0.3);
}

.status-icon {
    font-size: 1.3rem;
}

.status-done {
    color: var(--primary-green);
    filter: drop-shadow(0 0 5px rgba(0, 214, 91, 0.4));
}

.status-missing {
    color: var(--text-muted);
    /* More subtle than red */
    opacity: 0.3;
}

.matrix-header {
    text-align: center;
    font-size: 0.75rem;
}

/* Dashboard Hero */
.hero-title {
    font-size: 2.8rem;
    font-weight: 800;
    margin-bottom: 12px;
    background: linear-gradient(135deg, var(--text-white) 0%, var(--primary-green) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -1px;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-muted);
    margin-bottom: 40px;
    font-weight: 400;
}

.btn-primary {
    display: inline-block;
    background: linear-gradient(135deg, var(--primary-green), #00b04b);
    color: #000;
    padding: 12px 30px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 700;
    box-shadow: 0 4px 15px rgba(0, 214, 91, 0.25);
    transition: transform 0.2s, box-shadow 0.2s;
    border: none;
    cursor: pointer;
    font-size: 0.95rem;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 214, 91, 0.4);
}

/* Quiz UI */
.quiz-container {
    max-width: 900px;
    margin: 0 auto;
}

.question-card {
    background-color: var(--bg-panel);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 40px;
    margin-bottom: 24px;
    box-shadow: var(--shadow-soft);
}

.option-btn {
    background-color: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border-color);
    padding: 18px 24px;
    border-radius: 12px;
    color: var(--text-white);
    text-align: left;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: inherit;
    font-size: 1.05rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 500;
    width: 100%;
    margin-bottom: 14px;
    backdrop-filter: blur(5px);
}

.option-btn:last-child {
    margin-bottom: 0;
}

.option-btn:hover {
    background-color: var(--bg-hover);
    border-color: var(--primary-green);
    transform: translateX(4px);
    box-shadow: -4px 0 0 var(--primary-green);
}

.option-btn.selected {
    border-color: var(--primary-green);
    background-color: var(--bg-hover);
    box-shadow: -4px 0 0 var(--primary-green), inset 0 0 10px rgba(0, 0, 0, 0.1);
}

.input-answer {
    width: 100%;
    padding: 16px;
    background-color: var(--bg-dark);
    border: 2px solid var(--border-color);
    border-radius: 10px;
    color: var(--text-white);
    font-size: 1.1rem;
    margin-bottom: 20px;
    transition: border-color 0.2s;
}

.input-answer:focus {
    outline: none;
    border-color: var(--primary-green);
}

/* View Toggle Buttons */
/* Login & Auth Styles */
.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

.login-card {
    background-color: var(--bg-panel);
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.5);
    width: 100%;
    max-width: 450px;
    border: 1px solid var(--border-color);
    text-align: center;
}

.auth-logo {
    font-size: 2rem;
    font-weight: 800;
    color: var(--primary-green);
    margin-bottom: 30px;
    display: block;
    text-shadow: var(--shadow-glow);
}

.form-group {
    margin-bottom: 20px;
    text-align: left;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.form-group input {
    width: 100%;
    padding: 12px;
    background-color: #2c2c2c;
    border: 1px solid #444;
    border-radius: 6px;
    color: white;
    font-size: 1rem;
    font-family: inherit;
    transition: border-color 0.2s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-green);
}

.error-msg {
    color: var(--danger-red);
    background: rgba(255, 82, 82, 0.1);
    padding: 10px;
    border-radius: 4px;
    margin-bottom: 20px;
    text-align: center;
    font-size: 0.9rem;
}

.success-msg {
    color: var(--primary-green);
    background: rgba(0, 214, 91, 0.1);
    padding: 10px;
    border-radius: 4px;
    margin-bottom: 20px;
    text-align: center;
    font-size: 0.9rem;
}

.footer-link {
    display: block;
    margin-top: 20px;
    color: var(--text-muted);
    font-size: 0.9rem;
    text-decoration: none;
    transition: color 0.2s;
}


/* Modal Styles */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(0, 0, 0, 0.85);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 2000;
    backdrop-filter: blur(5px);
}

.modal-content {
    background-color: var(--bg-panel);
    padding: 40px;
    border-radius: 16px;
    border: 1px solid var(--border-color);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
    width: 400px;
    text-align: center;
    animation: modalPop 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes modalPop {
    from {
        opacity: 0;
        transform: scale(0.8);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}


/* Hint Modal Styles */
.hint-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(0, 0, 0, 0.85);
    display: none;
    /* Hidden by default */
    justify-content: center;
    align-items: center;
    z-index: 3000;
    backdrop-filter: blur(5px);
}

.hint-modal {
    background-color: var(--bg-panel);
    padding: 30px;
    border-radius: 12px;
    border: 1px solid var(--primary-green);
    box-shadow: 0 0 30px rgba(0, 214, 91, 0.2);
    width: 350px;
    text-align: center;
    animation: modalPop 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

/* Progress Bar */
.progress-container {
    width: 100%;
    height: 8px;
    background-color: var(--bg-panel);
    border-radius: 4px;
    margin-bottom: 30px;
    overflow: hidden;
    position: relative;
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.3);
}

.progress-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-green), var(--accent-green));
    width: 0%;
    transition: width 0.4s ease;
    border-radius: 4px;
    box-shadow: 0 0 10px rgba(0, 214, 91, 0.4);
}

/* Single Question View Adjustments */
.quiz-navigation-area {
    display: flex;
    justify-content: space-between;
    margin-top: 30px;
}

.btn-secondary {
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    padding: 10px 24px;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.2s;
}

.btn-secondary:hover {
    border-color: var(--text-white);
    color: var(--text-white);
    background-color: var(--bg-hover);
}

.question-card {
    /* display is now managed by JS (active/hidden) */
}

.question-card.active {
    display: block;
    animation: fadeIn 0.3s ease-in-out;
}

.question-card.hidden {
    display: none;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hint-icon {
    font-size: 2rem;
    color: var(--accent-green);
    margin-bottom: 15px;
}

.hint-text {
    color: var(--text-muted);
    font-style: italic;
    margin-bottom: 20px;
    line-height: 1.5;
}

/* Mode Selection Styles (Restored) */
.mode-selection-container {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin-top: 30px;
    flex-wrap: wrap;
}

.mode-card {
    background-color: var(--bg-panel);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 30px;
    width: 300px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-soft);
}

.mode-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-green);
    box-shadow: 0 10px 30px -10px rgba(0, 214, 91, 0.15);
}

.mode-icon {
    font-size: 3rem;
    margin-bottom: 20px;
    color: var(--text-muted);
    transition: color 0.3s;
}

.mode-card:hover .mode-icon {
    color: var(--primary-green);
}

.mode-card h3 {
    margin-bottom: 10px;
    font-size: 1.2rem;
    color: var(--text-white);
}

.mode-card p {
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.5;
    margin-bottom: 20px;
}

.mode-badge {
    display: inline-block;
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.mode-badge.practice {
    background-color: rgba(68, 138, 255, 0.1);
    color: #448AFF;
    border: 1px solid rgba(68, 138, 255, 0.3);
}

.mode-badge.real {
    background-color: rgba(0, 214, 91, 0.1);
    color: var(--primary-green);
    border: 1px solid rgba(0, 214, 91, 0.3);
}