:root {
    /* Apple + Pinterest + Braun Dark Mode Palette */
    --bg-base: #0B0B0C;
    --bg-surface: #121214;
    --bg-elevated: #1A1A1E;
    
    --text-primary: #F2F2F7;
    --text-secondary: #A1A1AA;
    --text-meta: #6E6E73;
    
    --accent: #C13B30; /* Muted Red - Pinterest emotion */
    --accent-hover: #D64A3F;
    
    --border: #2A2A2E;
    --border-light: rgba(255, 255, 255, 0.05);
    
    --radius: 14px;
    --spacing: 1.5rem;
    
    --transition: 250ms cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    background-color: var(--bg-base);
    color: var(--text-primary);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.6;
    overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4 {
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

h1 { font-size: 2.5rem; margin-bottom: 1rem; }
h2 { font-size: 1.75rem; margin-bottom: 1.5rem; }
p { color: var(--text-secondary); margin-bottom: 1rem; }

/* Layout */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

header {
    background: rgba(18, 18, 20, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 1rem 2rem;
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--text-primary);
    text-decoration: none;
}

.logo span {
    color: var(--accent);
}

/* Cards (Braun Minimal) */
.card {
    background-color: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: var(--spacing);
    margin-bottom: var(--spacing);
    transition: var(--transition);
}

.card:hover {
    border-color: var(--text-meta);
}

/* Buttons (Apple Discipline) */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    border-radius: 100px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    text-decoration: none;
}

.btn:active {
    transform: scale(0.98);
}

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

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

.btn-secondary {
    background-color: transparent;
    border: 1px solid var(--border);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background-color: var(--bg-elevated);
}

/* Tracker Styles */
.tracker-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1rem;
    border-radius: 12px;
    transition: var(--transition);
}

.tracker-checkbox {
    appearance: none;
    width: 24px;
    height: 24px;
    border: 2px solid var(--border);
    border-radius: 50%;
    cursor: pointer;
    position: relative;
    flex-shrink: 0;
    margin-top: 4px;
    transition: var(--transition);
}

.tracker-checkbox:checked {
    background-color: var(--accent);
    border-color: var(--accent);
}

.tracker-checkbox:checked::after {
    content: '✓';
    position: absolute;
    color: white;
    font-size: 14px;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
}

.tracker-item.completed {
    opacity: 0.6;
}

.tracker-item.completed .content-text {
    text-decoration: line-through;
}

/* Progress Bar */
.progress-container {
    width: 100%;
    height: 6px;
    background-color: var(--bg-elevated);
    border-radius: 3px;
    overflow: hidden;
    margin: 1rem 0;
}

.progress-fill {
    height: 100%;
    background-color: var(--accent);
    width: 0%;
    transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Pinterest Masonry (Simulated) */
.masonry-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

/* Utils */
.text-meta { color: var(--text-meta); font-size: 0.85rem; }
.text-secondary { color: var(--text-secondary); }
.badge {
    padding: 0.25rem 0.75rem;
    border-radius: 100px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}