:root {
    --bg-primary: #0d0d0d;
    --bg-secondary: #1a1a1a;
    --bg-tertiary: #252525;
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --accent: #6366f1;
    --accent-hover: #4f46e5;
    --danger: #ef4444;
    --danger-hover: #dc2626;
    --success: #22c55e;
    --success-hover: #16a34a;
    --border: #333333;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.5;
}

.app-container {
    max-width: 800px;
    margin: 0 auto;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

header {
    padding: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border);
}

header h1 {
    font-size: 1.5rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--text-primary);
}

.add-habit-btn {
    padding: 0.625rem 1.25rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    background-color: var(--accent);
    border: none;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.add-habit-btn:hover {
    background-color: var(--accent-hover);
    transform: translateY(-1px);
}

main {
    flex: 1;
    padding: 1.5rem;
}

.habits-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

@media (min-width: 640px) {
    .habits-container {
        grid-template-columns: repeat(2, 1fr);
    }
}

.habit-card {
    background-color: var(--bg-secondary);
    border-radius: 1rem;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.habit-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.habit-name {
    font-size: 1.125rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-secondary);
}

.delete-habit-btn {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    font-weight: 400;
    color: var(--text-secondary);
    background: transparent;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.2s ease;
}

.delete-habit-btn:hover {
    background-color: var(--danger);
    color: var(--text-primary);
}

.habit-streak {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 1.5rem 0;
}

.habit-streak-number {
    font-size: 5rem;
    font-weight: 800;
    line-height: 1;
    background: linear-gradient(135deg, var(--accent), #a855f7);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.habit-streak-label {
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: 0.3em;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

.daily-benefit {
    padding: 1rem 1.25rem;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.15), rgba(168, 85, 247, 0.15));
    border-radius: 0.75rem;
    border-left: 3px solid var(--accent);
}

.benefit-text {
    font-size: 0.9rem;
    font-style: italic;
    line-height: 1.6;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.benefit-source {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    text-align: right;
}

.habit-stats {
    display: flex;
    justify-content: space-between;
    gap: 0.5rem;
}

.habit-stat {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 0.75rem 0.5rem;
    background-color: var(--bg-tertiary);
    border-radius: 0.5rem;
}

.habit-stat .stat-label {
    font-size: 0.625rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.habit-stat .stat-value {
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--text-primary);
}

.habit-card .relapse-btn {
    width: 100%;
    padding: 1rem;
    font-size: 0.875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-primary);
    background-color: var(--danger);
    border: none;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all 0.2s ease;
    margin-top: 0.5rem;
}

.habit-card .relapse-btn:hover {
    background-color: var(--danger-hover);
    transform: translateY(-2px);
}

.habit-card .relapse-btn:active {
    transform: translateY(0);
}

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.85);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 100;
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background-color: var(--bg-secondary);
    border-radius: 1rem;
    padding: 2rem;
    max-width: 400px;
    width: 100%;
    text-align: center;
    transform: scale(0.9);
    transition: transform 0.3s ease;
}

.modal-overlay.active .modal {
    transform: scale(1);
}

.modal h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.consequence-habit {
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--danger);
    margin-bottom: 1rem;
}

.consequence-text {
    font-size: 1.25rem;
    font-weight: 600;
    line-height: 1.6;
    margin-bottom: 2rem;
    color: var(--text-primary);
    padding: 1.5rem;
    background-color: var(--bg-tertiary);
    border-radius: 0.75rem;
    border-left: 4px solid var(--danger);
}

.complete-btn {
    width: 100%;
    padding: 1rem 2rem;
    font-size: 1rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-primary);
    background-color: var(--success);
    border: none;
    border-radius: 0.75rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.complete-btn:hover {
    background-color: var(--success-hover);
    transform: translateY(-2px);
}

.complete-btn:active {
    transform: translateY(0);
}

.form-group {
    margin-bottom: 1.5rem;
    text-align: left;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.form-group input {
    width: 100%;
    padding: 1rem;
    font-size: 1rem;
    color: var(--text-primary);
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    outline: none;
    transition: border-color 0.2s ease;
}

.form-group input:focus {
    border-color: var(--accent);
}

.form-group input::placeholder {
    color: var(--text-secondary);
}

.modal-actions {
    display: flex;
    gap: 1rem;
}

.cancel-btn {
    flex: 1;
    padding: 1rem;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

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

.create-btn {
    flex: 1;
    padding: 1rem;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    background-color: var(--accent);
    border: none;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

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

/* Habit Actions */
.habit-actions {
    display: flex;
    gap: 0.75rem;
    margin-top: 0.5rem;
}

.history-btn {
    flex: 1;
    padding: 1rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.history-btn:hover {
    background-color: var(--border);
    transform: translateY(-2px);
}

.habit-actions .relapse-btn {
    flex: 2;
    margin-top: 0;
}

/* Relapse Context Modal */
.relapse-context-modal {
    max-width: 500px;
}

.modal-subtitle {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.form-group textarea {
    width: 100%;
    padding: 1rem;
    font-size: 1rem;
    font-family: inherit;
    color: var(--text-primary);
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    outline: none;
    transition: border-color 0.2s ease;
    resize: vertical;
    min-height: 100px;
}

.form-group textarea:focus {
    border-color: var(--accent);
}

.form-group textarea::placeholder {
    color: var(--text-secondary);
}

.quick-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.quick-tag {
    padding: 0.5rem 1rem;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 2rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.quick-tag:hover {
    background-color: var(--border);
    color: var(--text-primary);
}

.quick-tag.selected {
    background-color: var(--accent);
    border-color: var(--accent);
    color: var(--text-primary);
}

.skip-btn {
    flex: 1;
    padding: 1rem;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-secondary);
    background-color: transparent;
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.skip-btn:hover {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

/* History Modal */
.history-modal {
    max-width: 550px;
    max-height: 80vh;
    display: flex;
    flex-direction: column;
}

.history-list {
    flex: 1;
    overflow-y: auto;
    text-align: left;
    margin-bottom: 1rem;
    max-height: 400px;
}

.history-item {
    padding: 1rem;
    background-color: var(--bg-tertiary);
    border-radius: 0.5rem;
    margin-bottom: 0.75rem;
    border-left: 3px solid var(--danger);
}

.history-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.history-date {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
}

.history-meta {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.history-streak {
    font-size: 0.8rem;
    color: var(--danger);
    margin-bottom: 0.5rem;
}

.history-context {
    font-size: 0.875rem;
    color: var(--text-primary);
    padding: 0.75rem;
    background-color: var(--bg-secondary);
    border-radius: 0.375rem;
    line-height: 1.5;
}

.history-context.no-context {
    color: var(--text-secondary);
    font-style: italic;
}

.no-history {
    text-align: center;
    padding: 2rem;
    color: var(--text-secondary);
}

.pattern-analysis {
    padding: 1rem;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.15), rgba(168, 85, 247, 0.15));
    border-radius: 0.75rem;
    border-left: 3px solid var(--accent);
    margin-bottom: 1rem;
    font-size: 0.875rem;
    line-height: 1.8;
}

@media (min-width: 640px) {
    header h1 {
        font-size: 1.75rem;
    }

    .habit-streak-number {
        font-size: 6rem;
    }

    .habit-streak-label {
        font-size: 1.125rem;
    }
}

/* Sync Badge */
.sync-badge {
    font-size: 0.75rem;
    vertical-align: super;
    opacity: 0.7;
    cursor: help;
    animation: pulse-subtle 3s infinite;
}

@keyframes pulse-subtle {
    0%, 100% { opacity: 0.5; }
    50% { opacity: 1; }
}