:root {
    --primary-color: #22223b;         /* Deep blue-gray */
    --secondary-color: #4ea8de;       /* Soft blue */
    --accent-color: #f3722c;          /* Vibrant orange */
    --light-bg: #f8f9fa;              /* Very light gray */
    --card-bg: #ffffff;               /* Card background */
    --text-on-primary: #ffffff;       /* For text on dark backgrounds */
    --text-on-light: #22223b;         /* For text on light backgrounds */
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--light-bg);
    color: var(--text-on-light);
    transition: background 0.3s ease, color 0.3s ease;
}

body.dark-mode {
    --primary-color: #f8f9fa;
    --secondary-color: #4ea8de;
    --accent-color: #f9c74f;          
    --light-bg: #23272f;
    --card-bg: #2d3142;
    --text-on-primary: #23272f;
    --text-on-light: #f8f9fa;
    background-color: var(--light-bg);
    color: var(--text-on-light);
}

/* Hero Title */
.main-title {
    text-align: center;
    margin: 30px 0;
    color: var(--secondary-color);
    font-weight: 700;
}

/* Hero Section */
.hero-section {
    background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
    color: var(--text-on-primary);
    padding: 60px 0 40px;
    margin-bottom: 40px;
}

.hero-section h1 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    color: var(--text-on-primary);
}

.hero-section img {
    max-width: 100%;
    height: auto;
    border-radius: 10px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

/* Section Card */
.section-card {
    background: var(--card-bg);
    border-radius: 15px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    padding: 30px;
    margin-bottom: 30px;
    color: var(--text-on-light);
    transition: background 0.3s ease;
}

body.dark-mode .section-card {
    color: var(--text-on-light);
}

/* Task Grid */
.task-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 10px;
    margin-top: 20px;
}

/* Task Button */
.task-btn {
    padding: 12px 8px;
    border-radius: 8px;
    background: var(--card-bg);
    border: 1px solid rgba(0, 0, 0, 0.1);
    text-align: center;
    transition: all 0.2s ease;
    text-decoration: none !important;
    color: var(--primary-color) !important;
    font-size: 0.9rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 70px;
}

body.dark-mode .task-btn {
    color: var(--text-on-light) !important;
    border: 1px solid rgba(255,255,255,0.08);
}

.task-btn:hover {
    transform: scale(1.03);
    box-shadow: 0 0 12px var(--secondary-color);
    background: var(--secondary-color);
    color: var(--text-on-primary) !important;
}

/* Task number */
.task-btn .task-number {
    font-size: 0.7rem;
    opacity: 0.8;
    margin-top: 5px;
}

/* Disabled Button */
.task-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    background: #ccc;
    color: #555 !important;
    border: 1px dashed #999;
}

.task-btn:disabled:hover {
    transform: none;
    box-shadow: none;
}

/* Section Title */
.section-title {
    border-left: 4px solid var(--secondary-color);
    padding-left: 15px;
    margin: 30px 0;
    color: var(--primary-color);
}

/* Weekly Cards */
.week-card {
    margin-bottom: 25px;
    border-radius: 10px;
    overflow: hidden;
    border: 1px solid rgba(0, 0, 0, 0.1);
    background: var(--card-bg);
    color: var(--text-on-light);
}

.week-header {
    background: var(--light-bg);
    padding: 15px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background 0.2s ease;
    color: var(--primary-color);
}

body.dark-mode .week-header {
    background: #23272f;
    color: var(--text-on-light);
}

.week-header:hover {
    background: #e9ecef;
}

body.dark-mode .week-header:hover {
    background: #34394a;
}

/* Toggle icon animation */
.collapse-icon {
    transition: transform 0.3s ease;
}
.week-header.collapsed .collapse-icon {
    transform: rotate(0deg);
}
.week-header:not(.collapsed) .collapse-icon {
    transform: rotate(180deg);
}

/* Custom Badges */
.badge-custom {
    background: var(--accent-color); 
    color: var(--text-on-primary);
}

/* Custom Buttons */
.btn-add-daily,
.btn-add-random,
.btn-add-new {
    color: var(--text-on-primary);
    margin-top: 15px;
    border-radius: 5px;
    padding: 6px 12px;
    font-size: 0.9rem;
    border: none;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    transition: background 0.3s ease, transform 0.2s ease;
}

.btn-add-daily {
    background: var(--secondary-color);
}

.btn-add-random {
    background-color: var(--accent-color);
}

.btn-add-new {
    background-color: #43aa8b;
}

.btn-add-new:hover {
    background: #2d6a4f;
    color: var(--text-on-primary);
    transform: translateY(-1px);
}

/* Mode Toggle */
.mode-toggler {
    width: 10rem;
    cursor: pointer;
    font-size: 1.2rem;
    font-weight: 600;
    padding: 10px 15px;
    background: transparent;
    border: 2px solid var(--secondary-color);
    color: var(--secondary-color);
    border-radius: 10px;
    transition: all 0.3s ease;
    text-align: center;
    margin: 10px auto;
}

.mode-toggler:hover {
    background-color: var(--secondary-color);
    color: var(--text-on-primary);
    transform: scale(1.05);
}

/* Footer */
footer {
    border-top: 3px solid var(--secondary-color);
    box-shadow: 0 -3px 5px rgba(0, 0, 0, 0.05);
    font-size: 0.9rem;
}

footer a {
    transition: color 0.2s ease;
}

footer a:hover {
    color: var(--accent-color);
}