:root {
    --primary: #c43030;        /* Indigo */
    --primary-dark: #7b0e19;
    --accent: #961d2b;         /* Cyan */
    --bg-light: #f8fafc;
    --card-bg: #ffffff;
    --text-dark: #1e293b;
    --text-light: #f1f5f9;
    --border: #e2e8f0;
}

/* RESET */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', sans-serif;
}

body {
    background: var(--bg-light);
    color: var(--text-dark);
    text-align: center;
    transition: 0.3s ease;
}

/* DARK MODE */
body.dark-mode {
    background: #0f172a;
    color: var(--text-light);
}

/* HEADER */
header {
    padding: 50px 10px;
}

header h1 {
    font-size: 3.5rem;
    letter-spacing: 2px;
}

.accent {
    color: var(--primary);
}

/* NAVIGATION */
.dashboard-controls {
    display: flex;
    justify-content: center;
    gap: 15px;
    flex-wrap: wrap;
    margin-bottom: 30px;
}

.dash-btn {
    padding: 10px 28px;
    border-radius: 8px;
    border: none;
    background: var(--primary);
    color: white;
    font-weight: 600;
    cursor: pointer;
    transition: 0.3s ease;
}

.dash-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

/* CARD LAYOUT */
.module-card {
    max-width: 900px;
    margin: auto;
    background: var(--card-bg);
    border-radius: 16px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
    overflow: hidden;
    margin-bottom: 30px;
}

body.dark-mode .module-card {
    background: #1e293b;
}

/* CARD HEADER */
.module-label {
    background: var(--primary);
    color: white;
    padding: 18px;
    font-weight: bold;
    letter-spacing: 1px;
}

/* TERMINAL VIEW */
.terminal-view {
    padding: 30px;
    text-align: left;
    min-height: 250px;
    line-height: 1.6;
}

/* ACTIVITY BUTTON BAR */
.activity-bar {
    display: flex;
    justify-content: center;
    gap: 10px;
    padding: 20px;
    flex-wrap: wrap;
    background: #f1f5f9;
}

body.dark-mode .activity-bar {
    background: #0f172a;
}

/* SMALL NUMBER BUTTONS */
.activity-bar.tiny button {
    width: 45px;
    height: 45px;
    border-radius: 8px;
    border: 2px solid var(--primary);
    background: white;
    font-weight: bold;
    cursor: pointer;
    transition: 0.3s;
}

.activity-bar.tiny button:hover {
    background: var(--primary);
    color: white;
}

/* MAIN ACTION BUTTONS */
.action-btn {
    background: var(--primary);
    color: white;
    padding: 10px 20px;
    border-radius: 8px;
    border: none;
    font-weight: 600;
    cursor: pointer;
    transition: 0.3s ease;
}

.action-btn:hover {
    background: var(--primary-dark);
    transform: scale(1.05);
}

/* INPUT FIELDS */
input {
    width: 100%;
    max-width: 400px;
    padding: 12px;
    margin: 10px 0;
    border-radius: 8px;
    border: 1px solid var(--border);
    font-size: 14px;
}

/* LISTS */
ul {
    margin-top: 10px;
    padding-left: 20px;
}

/* HIDDEN */
.hidden {
    display: none !important;
}
#targetImg {
    width: 250px;
    height: auto;
    transition: all 0.2s ease;
    background-color: #fff;
}

#targetImg:hover {
    transform: translate(-3px, -3px);
    box-shadow: 12px 12px 0 var(--baby-blue) !important;
}

/* Dark mode version for the image border */
body.dark-mode #targetImg {
    border-color: var(--baby-blue);
    box-shadow: 8px 8px 0 #000 !important;
}

/* ===== EXERCISE 4 GRADE CALCULATOR ===== */

.grade-container{
    max-width:420px;
    margin:auto;
}

.input-group{
    display:flex;
    align-items:center;
    justify-content:space-between;
    margin-bottom:15px;
}

.input-group label{
    width:40%;
    font-weight:600;
}

.input-group input{
    width:58%;
}

.buttons{
    display:flex;
    gap:10px;
    margin-top:15px;
}

.buttons button{
    flex:1;
}

.result{
    margin-top:20px;
    text-align:center;
}