:root {
    /* Color Palette - Dark Forest Green with Muted Accents */
    --color-primary: hsl(150, 45%, 25%);
    --color-primary-light: hsl(150, 45%, 35%);
    --color-primary-dark: hsl(150, 45%, 18%);

    --color-secondary: hsl(210, 30%, 35%);
    --color-secondary-light: hsl(210, 30%, 45%);

    --color-accent: hsl(30, 50%, 45%);
    --color-accent-light: hsl(30, 50%, 55%);

    --color-success: hsl(150, 45%, 30%);
    --color-warning: hsl(40, 70%, 50%);
    --color-danger: hsl(0, 50%, 50%);

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, hsl(150, 45%, 25%) 0%, hsl(210, 30%, 35%) 100%);
    --gradient-sunset: linear-gradient(135deg, hsl(30, 50%, 45%) 0%, hsl(210, 30%, 35%) 50%, hsl(150, 45%, 25%) 100%);
    --gradient-card: linear-gradient(135deg, rgba(46, 125, 50, 0.08) 0%, rgba(46, 125, 50, 0.03) 100%);

    /* Dark Theme Colors */
    --color-bg: hsl(0, 0%, 10%);
    --color-bg-secondary: hsl(0, 0%, 14%);
    --color-bg-tertiary: hsl(0, 0%, 18%);

    --color-text: hsl(0, 0%, 92%);
    --color-text-secondary: hsl(0, 0%, 68%);
    --color-text-tertiary: hsl(0, 0%, 48%);

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;

    /* Border Radius */
    --radius-sm: 0.5rem;
    --radius-md: 1rem;
    --radius-lg: 1.5rem;
    --radius-xl: 2rem;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.15);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.25);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.35);
    --shadow-glow: 0 0 30px rgba(46, 125, 50, 0.25);

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.5rem;
    --font-size-2xl: 2rem;
    --font-size-3xl: 3rem;
}

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

body {
    font-family: var(--font-family);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Background Animation */
body::before {
    content: '';
    position: fixed;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 20% 50%, hsla(150, 45%, 25%, 0.12) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, hsla(210, 30%, 35%, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 40% 20%, hsla(30, 50%, 45%, 0.06) 0%, transparent 50%);
    animation: gradientShift 20s ease infinite;
    z-index: -1;
}

@keyframes gradientShift {

    0%,
    100% {
        transform: translate(0, 0) rotate(0deg);
    }

    50% {
        transform: translate(-5%, -5%) rotate(5deg);
    }
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-lg);
}

/* Header */
header {
    text-align: center;
    padding: var(--spacing-xl) 0 var(--spacing-lg);
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.logo img {
    width: 64px;
    height: 64px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
}

h1 {
    font-size: var(--font-size-3xl);
    font-weight: 800;
    background: var(--gradient-sunset);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-xs);
}

.tagline {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    font-weight: 300;
}

/* Card Base */
.card {
    background: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid rgba(255, 255, 255, 0.1);
    position: relative;
    overflow: hidden;
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-card);
    opacity: 0;
    transition: opacity var(--transition-normal);
    pointer-events: none;
}

.card:hover::before {
    opacity: 1;
}

/* Daily Challenge Card */
.daily-challenge {
    margin-bottom: var(--spacing-xl);
    text-align: center;
}

.daily-challenge.completed {
    border: 2px solid var(--color-success);
    box-shadow: 0 0 30px rgba(150, 200, 150, 0.2);
}

.challenge-header {
    margin-bottom: var(--spacing-lg);
}

.date-display {
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: var(--spacing-xs);
}

.challenge-title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.challenge-content {
    min-height: 200px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
}

.activity-card {
    background: var(--color-bg-tertiary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    border: 2px dashed rgba(255, 255, 255, 0.2);
    width: 100%;
    max-width: 500px;
}

.activity-category {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--spacing-sm);
}

.category-coffee {
    background: linear-gradient(135deg, hsl(25, 45%, 35%), hsl(20, 40%, 28%));
}

.category-cats {
    background: linear-gradient(135deg, hsl(280, 35%, 40%), hsl(270, 30%, 32%));
}

.category-transit {
    background: linear-gradient(135deg, hsl(200, 40%, 38%), hsl(210, 35%, 30%));
}

.category-routes {
    background: linear-gradient(135deg, hsl(150, 45%, 30%), hsl(160, 40%, 24%));
}

.category-dance {
    background: linear-gradient(135deg, hsl(340, 40%, 40%), hsl(350, 35%, 32%));
}

.category-physical {
    background: linear-gradient(135deg, hsl(15, 45%, 38%), hsl(10, 40%, 30%));
}

.category-entertainment {
    background: linear-gradient(135deg, hsl(230, 35%, 38%), hsl(240, 30%, 30%));
}

.activity-text {
    font-size: var(--font-size-xl);
    font-weight: 600;
    line-height: 1.4;
    color: var(--color-text);
}

.locked-message {
    text-align: center;
    color: var(--color-text-secondary);
}

.locked-icon {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-sm);
    opacity: 0.5;
}

.locked-message h3 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-xs);
}

/* Buttons */
.btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    font-family: var(--font-family);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    transform: translate(-50%, -50%);
    transition: width var(--transition-slow), height var(--transition-slow);
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-success {
    background: var(--color-success);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-success:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 32px rgba(150, 200, 150, 0.3);
}

.btn-secondary {
    background: var(--color-bg-tertiary);
    color: var(--color-text);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-secondary:hover {
    background: var(--color-bg-secondary);
    border-color: rgba(255, 255, 255, 0.3);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    /* Fixed to 2 columns */
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
    max-width: 800px;
    /* Limit width for better appearance */
    margin-left: auto;
    margin-right: auto;
}

.stat-card {
    background: var(--color-bg-secondary);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: transform var(--transition-fast);
}

.stat-card:hover {
    transform: translateY(-4px);
}

.stat-value {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    background: var(--gradient-sunset);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: block;
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Activity Management */
.activity-management {
    margin-bottom: var(--spacing-xl);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.section-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-text);
}

.activities-list {
    display: grid;
    gap: var(--spacing-sm);
}

.activity-item {
    background: var(--color-bg-tertiary);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all var(--transition-fast);
}

.activity-item:hover {
    border-color: var(--color-primary);
    transform: translateX(4px);
}

.activity-info {
    flex: 1;
}

.activity-name {
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.activity-actions {
    display: flex;
    gap: var(--spacing-xs);
}

.btn-icon {
    padding: var(--spacing-xs);
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--color-text);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: var(--font-size-sm);
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-icon:hover {
    background: var(--color-primary);
    border-color: var(--color-primary);
}

.btn-icon.delete:hover {
    background: var(--color-danger);
    border-color: var(--color-danger);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    animation: fadeIn var(--transition-fast);
}

.modal.active {
    display: flex;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

.modal-content {
    background: var(--color-bg-secondary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    max-width: 500px;
    width: 90%;
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(255, 255, 255, 0.1);
    animation: slideUp var(--transition-normal);
}

@keyframes slideUp {
    from {
        transform: translateY(50px);
        opacity: 0;
    }

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

.modal-header {
    margin-bottom: var(--spacing-lg);
}

.modal-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: var(--spacing-sm);
    background: var(--color-bg-tertiary);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-sm);
    color: var(--color-text);
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    transition: border-color var(--transition-fast);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--color-primary);
}

.form-textarea {
    resize: vertical;
    min-height: 100px;
}

.modal-actions {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: flex-end;
    margin-top: var(--spacing-lg);
}

/* History */
.history-list {
    display: grid;
    gap: var(--spacing-sm);
    max-height: 400px;
    overflow-y: auto;
    padding-right: var(--spacing-xs);
}

.history-list::-webkit-scrollbar {
    width: 8px;
}

.history-list::-webkit-scrollbar-track {
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-sm);
}

.history-list::-webkit-scrollbar-thumb {
    background: var(--color-primary);
    border-radius: var(--radius-sm);
}

.history-item {
    background: var(--color-bg-tertiary);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--color-success);
}

.history-date {
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
    margin-bottom: var(--spacing-xs);
}

.history-activity {
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

/* Diary Entry in History */
.diary-entry {
    margin-top: var(--spacing-sm);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.diary-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm);
    cursor: pointer;
    transition: background var(--transition-fast);
    user-select: none;
}

.diary-header:hover {
    background: rgba(255, 255, 255, 0.05);
}

.diary-icon {
    font-size: var(--font-size-base);
}

.diary-label {
    flex: 1;
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text-secondary);
}

.diary-toggle {
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
    transition: transform var(--transition-fast);
}

.diary-content {
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--color-text);
    line-height: 1.6;
    font-size: var(--font-size-sm);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    white-space: pre-wrap;
}

.no-diary {
    margin-top: var(--spacing-sm);
    padding: var(--spacing-xs) 0;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--color-text-secondary);
}

.empty-state-icon {
    font-size: var(--font-size-3xl);
    opacity: 0.3;
    margin-bottom: var(--spacing-sm);
}

/* Responsive */
@media (max-width: 768px) {
    :root {
        --font-size-3xl: 2rem;
        --font-size-2xl: 1.5rem;
        --font-size-xl: 1.25rem;
    }

    .container {
        padding: var(--spacing-sm);
    }

    header {
        padding: var(--spacing-lg) 0;
    }

    .stats-grid {
        grid-template-columns: 1fr 1fr;
    }

    .modal-content {
        width: 95%;
        padding: var(--spacing-lg);
    }
}

/* Reminder Banner */
.reminder-banner {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: linear-gradient(135deg, var(--color-warning), var(--color-accent));
    color: var(--color-bg);
    padding: var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow-lg);
    z-index: 1001;
    animation: slideDown var(--transition-normal);
    font-weight: 600;
}

.reminder-banner button {
    background: transparent;
    border: none;
    color: var(--color-bg);
    font-size: var(--font-size-xl);
    cursor: pointer;
    padding: 0 var(--spacing-sm);
    transition: transform var(--transition-fast);
}

.reminder-banner button:hover {
    transform: scale(1.2);
}

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

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

/* Animations */
@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.5;
    }
}

.pulse {
    animation: pulse 2s ease-in-out infinite;
}

@keyframes bounce {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-10px);
    }
}

.bounce {
    animation: bounce 1s ease-in-out infinite;
}

/* Utility Classes */
.hidden {
    display: none !important;
}

.text-center {
    text-align: center;
}

.mt-sm {
    margin-top: var(--spacing-sm);
}

.mt-md {
    margin-top: var(--spacing-md);
}

.mt-lg {
    margin-top: var(--spacing-lg);
}

.mb-sm {
    margin-bottom: var(--spacing-sm);
}

.mb-md {
    margin-bottom: var(--spacing-md);
}

.mb-lg {
    margin-bottom: var(--spacing-lg);
}