:root {
    --primary-color: #5B4CFF;
    --success-color: #00C896;
    --danger-color: #FF4757;
    --bg-color: #F8F9FA;
    --text-color: #2C3E50;
    --card-bg: #FFFFFF;
    --border-color: #E1E8ED;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.navbar {
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
}

.navbar-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    text-decoration: none;
    color: var(--text-color);
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    padding: 0.5rem 0;
}

/* Hamburger Menu Button */
.nav-menu-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    gap: 0.35rem;
}

.nav-menu-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--text-color);
    border-radius: 2px;
    transition: all 0.3s ease;
}

.nav-menu-toggle:hover span {
    background-color: var(--primary-color);
}

.hero {
    text-align: center;
    padding: 4rem 0;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.tagline {
    font-size: 1.25rem;
    color: #666;
    margin-bottom: 3rem;
}

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.feature {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.feature h3 {
    margin-bottom: 0.5rem;
}

.btn {
    display: inline-block;
    padding: 0.75rem 2rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s ease;
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.btn-primary:hover {
    background-color: #4A3EE0;
}

.login-container {
    max-width: 400px;
    margin: 4rem auto;
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.login-form {
    margin-top: 2rem;
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.form-group input {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
    min-height: 44px;
}

.dashboard {
    padding: 2rem 0;
}

.welcome-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.streak-display {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--card-bg);
    padding: 1rem 1.5rem;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    margin-bottom: 2rem;
}

@media (max-width: 480px) {
    .streak-display {
        padding: 0.75rem 1rem;
        margin-bottom: 1.5rem;
    }
}

.streak-icon {
    font-size: 2rem;
}

.streak-number {
    font-size: 2rem;
    font-weight: bold;
    color: var(--primary-color);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

@media (max-width: 480px) {
    .stats-grid {
        gap: 1rem;
        margin-bottom: 1.5rem;
    }
}

.stat-card {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    text-align: center;
}

.stat-value {
    font-size: 2rem;
    font-weight: bold;
    margin-top: 0.5rem;
}

.stat-positive {
    color: var(--success-color);
}

.stat-negative {
    color: var(--danger-color);
}

.current-week {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    margin-bottom: 3rem;
}

@media (max-width: 480px) {
    .current-week {
        padding: 1rem;
    }
}

.add-reso-form {
    display: flex;
    gap: 1rem;
    margin: 1rem 0;
    flex-direction: column;
}

.add-reso-form input {
    flex: 1;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
    min-height: 44px;
}

@media (max-width: 480px) {
    .add-reso-form {
        gap: 0.5rem;
        margin: 0.75rem 0;
    }
}

@media (min-width: 768px) {
    .add-reso-form {
        flex-direction: row;
    }
}

.resos-list {
    margin-top: 1rem;
}

@media (max-width: 480px) {
    .resos-list {
        margin-top: 0.75rem;
    }
}

.reso-item {
    display: flex;
    align-items: center;
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    transition: all 0.3s ease;
    gap: 1rem;
}

@media (max-width: 480px) {
    .reso-item {
        padding: 0.75rem 0.5rem;
        gap: 0.5rem;
    }
}

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

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

/* Progress Counter Styles */
.progress-counter {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    min-width: 120px;
}

.counter-btn {
    min-width: 44px;
    min-height: 44px;
    border: 1px solid var(--border-color);
    background: white;
    border-radius: 6px;
    font-size: 1.2rem;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.counter-display {
    font-weight: bold;
    min-width: 50px;
    text-align: center;
}

.reso-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.progress-bar {
    height: 8px;
    background: #e9ecef;
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--primary-color);
    transition: width 0.3s ease;
    border-radius: 4px;
}

.checkbox-container {
    display: inline-block;
    position: relative;
    padding-left: 30px;
    margin-right: 1rem;
    cursor: pointer;
}

.checkbox-container input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
}

.checkmark {
    position: absolute;
    top: 0;
    left: 0;
    height: 20px;
    width: 20px;
    background-color: #eee;
    border-radius: 4px;
}

.checkbox-container:hover input ~ .checkmark {
    background-color: #ccc;
}

.checkbox-container input:checked ~ .checkmark {
    background-color: var(--success-color);
}

.checkmark:after {
    content: "";
    position: absolute;
    display: none;
    left: 7px;
    top: 3px;
    width: 5px;
    height: 10px;
    border: solid white;
    border-width: 0 3px 3px 0;
    transform: rotate(45deg);
}

.checkbox-container input:checked ~ .checkmark:after {
    display: block;
}

.reso-text {
    flex: 1;
}

.reso-amount {
    font-weight: bold;
    color: var(--primary-color);
}

/* Delete button */
.delete-btn {
    margin-left: auto;
    width: 30px;
    height: 30px;
    border: none;
    background: transparent;
    color: #999;
    font-size: 1.5rem;
    cursor: pointer;
    border-radius: 50%;
    transition: all 0.2s ease;
    opacity: 0;
}

/* Desktop: show on hover */
@media (min-width: 481px) {
    .reso-item:hover .delete-btn {
        opacity: 1;
    }

    .delete-btn:hover {
        background: var(--danger-color);
        color: white;
        transform: scale(1.1);
    }
}

/* Mobile: always visible */
@media (max-width: 480px) {
    .delete-btn {
        opacity: 1;
        color: #666;
    }

    .delete-btn:active {
        background: var(--danger-color);
        color: white;
        transform: scale(1.1);
    }
}

/* Notification toast */
.notification {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: #333;
    color: white;
    padding: 1rem 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.2);
    transition: all 0.3s ease;
    z-index: 1000;
}

.notification.show {
    transform: translateX(-50%) translateY(0);
}

.achievements {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

@media (max-width: 480px) {
    .achievements {
        padding: 1rem;
    }
}

.badges-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.badge {
    text-align: center;
    padding: 1.5rem;
    border-radius: 10px;
    background: #f5f5f5;
    opacity: 0.5;
    transition: all 0.3s ease;
}

.badge.earned {
    opacity: 1;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.badge-icon {
    font-size: 3rem;
    margin-bottom: 0.5rem;
}

.badge h4 {
    margin-bottom: 0.25rem;
}

.badge p {
    font-size: 0.875rem;
    opacity: 0.9;
}

.leaderboard {
    padding: 2rem 0;
}

.leaderboard h1 {
    text-align: center;
    margin-bottom: 2rem;
}

.leaderboard-table {
    background: var(--card-bg);
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    overflow: hidden;
}

table {
    width: 100%;
    border-collapse: collapse;
}

th {
    background: var(--primary-color);
    color: white;
    padding: 1rem;
    text-align: left;
}

td {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
}

tr:last-child td {
    border-bottom: none;
}

.rank {
    font-weight: bold;
    color: var(--primary-color);
}

/* Compare View Styles */
.compare-container {
    padding: 2rem 0;
}

.split-screen {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 2rem;
    background: var(--card-bg);
    border-radius: 10px;
    padding: 2rem;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    margin-bottom: 3rem;
}

.user-side {
    flex: 1;
}

.user-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--border-color);
}

.week-stats {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.completion-badge {
    background: var(--primary-color);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-weight: bold;
}

.divider {
    width: 2px;
    background: var(--border-color);
    margin: 0 1rem;
}

.resos-column h3 {
    font-size: 0.9rem;
    color: #666;
    margin-bottom: 1rem;
}

.reso-compare-item {
    display: flex;
    align-items: center;
    padding: 0.75rem;
    margin-bottom: 0.5rem;
    background: #f8f9fa;
    border-radius: 6px;
    transition: all 0.2s ease;
}

.reso-compare-item.completed {
    background: #e8f5f0;
}

.status-icon {
    font-size: 1.25rem;
    margin-right: 0.75rem;
}

.week-summary {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
    text-align: center;
    color: #666;
}

/* Comparison Grid */
.comparison-grid {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    margin-bottom: 3rem;
}

.comparison-table {
    width: 100%;
    border-collapse: collapse;
}

.comparison-table th {
    background: #f8f9fa;
    padding: 1rem;
    text-align: center;
    font-weight: 600;
    border-bottom: 2px solid var(--border-color);
}

.comparison-table td {
    padding: 0.75rem;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
}

.week-row {
    cursor: pointer;
    transition: background-color 0.2s ease;
}

.week-row:hover {
    background-color: #f8f9fa;
}

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

.chevron {
    display: inline-block;
    transition: transform 0.3s ease;
    font-size: 0.8rem;
}

.week-date {
    font-weight: 500;
}

.user-score, .friend-score {
    font-weight: 500;
}

.user-rate, .friend-rate {
    font-weight: bold;
}

.high-rate {
    color: var(--success-color);
}

.medium-rate {
    color: #f39c12;
}

.low-rate {
    color: var(--danger-color);
}

.winner-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: bold;
}

.winner-badge.me {
    background: var(--success-color);
    color: white;
}

.winner-badge.them {
    background: #e74c3c;
    color: white;
}

.winner-badge.tie {
    background: #95a5a6;
    color: white;
}

/* Stats Comparison */
.stats-comparison {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.stats-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 1.5rem;
}

.stat-comparison-card {
    background: #f8f9fa;
    padding: 1.5rem;
    border-radius: 8px;
}

.stat-bars {
    margin-top: 1rem;
}

.stat-bar {
    display: flex;
    align-items: center;
    margin-bottom: 1rem;
}

.stat-bar .label {
    width: 100px;
    font-weight: 500;
}

.bar-container {
    flex: 1;
    height: 24px;
    background: #e1e8ed;
    border-radius: 12px;
    margin: 0 1rem;
    overflow: hidden;
}

.bar {
    height: 100%;
    transition: width 0.5s ease;
}

.my-bar {
    background: var(--primary-color);
}

.friend-bar {
    background: #e74c3c;
}

.stat-bar .value {
    font-weight: bold;
    min-width: 40px;
    text-align: right;
}

.money-flow {
    text-align: center;
    margin-top: 1rem;
}

.money-status {
    font-size: 1.25rem;
    padding: 1rem;
    border-radius: 8px;
}

.money-status.positive {
    background: #e8f5f0;
    color: var(--success-color);
}

.money-status.negative {
    background: #ffeaa7;
    color: #d63031;
}

.money-status.neutral {
    background: #f8f9fa;
    color: #666;
}

/* Week Details Expansion */
.week-details td {
    padding: 0;
}

.details-container {
    background: #f8f9fa;
    padding: 1.5rem;
    border-top: 2px solid var(--primary-color);
}

.week-details-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.details-column h4 {
    margin-bottom: 1rem;
    color: var(--primary-color);
    font-size: 1rem;
}

.detail-reso {
    padding: 0.5rem;
    margin-bottom: 0.5rem;
    border-radius: 6px;
    font-size: 0.875rem;
}

.detail-reso.completed {
    background: #e8f5f0;
    color: var(--success-color);
}

.detail-reso.incomplete {
    background: #ffeaa7;
    color: #d63031;
}

.no-resos {
    color: #999;
    font-style: italic;
    text-align: center;
    padding: 1rem;
}

.loading {
    text-align: center;
    color: #999;
    padding: 2rem;
}

.error {
    text-align: center;
    color: var(--danger-color);
    padding: 2rem;
}

.load-more-container {
    text-align: center;
    margin-top: 2rem;
}

.btn-secondary {
    background-color: #6c757d;
    color: white;
}

.btn-secondary:hover {
    background-color: #5a6268;
}

.btn-secondary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Celebration Animations */
.reso-item {
    position: relative;
    overflow: visible;
}

.confetti-container {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1000;
}

.confetti {
    position: absolute;
    width: 10px;
    height: 10px;
    background-color: #f0f;
    animation: confetti-fall 2s ease-out forwards;
}

@keyframes confetti-fall {
    0% {
        transform: translateY(0) rotate(0deg);
        opacity: 1;
    }
    100% {
        transform: translateY(-200px) rotate(720deg);
        opacity: 0;
    }
}

.success-pulse {
    animation: pulse-success 0.6s ease-in-out;
}

@keyframes pulse-success {
    0% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(76, 175, 80, 0.7);
    }
    50% {
        transform: scale(1.02);
        box-shadow: 0 0 20px 10px rgba(76, 175, 80, 0);
    }
    100% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(76, 175, 80, 0);
    }
}

.success-message {
    position: absolute;
    top: -40px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--success-color);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-weight: bold;
    font-size: 1.1rem;
    animation: message-pop 0.5s ease-out forwards;
    white-space: nowrap;
    z-index: 1001;
}

@keyframes message-pop {
    0% {
        opacity: 0;
        transform: translateX(-50%) translateY(10px) scale(0.8);
    }
    50% {
        transform: translateX(-50%) translateY(-5px) scale(1.1);
    }
    100% {
        opacity: 1;
        transform: translateX(-50%) translateY(0) scale(1);
    }
}

/* Extra visual feedback for completion */
.reso-item.completed {
    transition: all 0.3s ease;
    background-color: #f0f8f0;
}

/* Make confetti pieces varied */
.confetti:nth-child(odd) {
    width: 8px;
    height: 8px;
    animation-duration: 1.5s;
}

.confetti:nth-child(even) {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.confetti:nth-child(3n) {
    animation-duration: 2.5s;
    transform: rotate(45deg);
}

/* Week complete celebration */
.week-complete-banner {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 3rem;
    border-radius: 20px;
    text-align: center;
    z-index: 9999;
    animation: banner-appear 0.5s ease-out;
    box-shadow: 0 10px 40px rgba(0,0,0,0.3);
}

@keyframes banner-appear {
    from {
        opacity: 0;
        transform: translate(-50%, -50%) scale(0.8);
    }
    to {
        opacity: 1;
        transform: translate(-50%, -50%) scale(1);
    }
}

.week-complete-banner h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.top-confetti {
    position: absolute;
    width: 10px;
    height: 10px;
    top: -10px;
    animation: top-confetti-fall 3s ease-out forwards;
}

@keyframes top-confetti-fall {
    0% {
        transform: translateY(0) rotate(0deg);
        opacity: 1;
    }
    100% {
        transform: translateY(400px) rotate(720deg);
        opacity: 0;
    }
}

/* Tablet and smaller screens */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2rem;
    }

    .nav-menu-toggle {
        display: flex;
    }

    .nav-links {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--card-bg);
        border-bottom: 1px solid var(--border-color);
        flex-direction: column;
        gap: 0;
        padding: 1rem 0;
        display: none;
        width: 100%;
        z-index: 1000;
    }

    .nav-links.active {
        display: flex;
    }

    .nav-links a {
        padding: 0.75rem 1rem;
        display: block;
    }

    .nav-links a:hover {
        background-color: var(--bg-color);
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .welcome-header {
        flex-direction: column;
        gap: 1rem;
    }

    .split-screen {
        grid-template-columns: 1fr;
        gap: 0;
    }

    .divider {
        display: none;
    }

    .user-side:first-child {
        border-bottom: 2px solid var(--border-color);
        padding-bottom: 2rem;
        margin-bottom: 2rem;
    }

    .comparison-table {
        font-size: 0.875rem;
    }

    .comparison-table th, .comparison-table td {
        padding: 0.5rem;
    }

    .week-details-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .expand-icon {
        padding: 0.25rem;
    }
}

/* Mobile phones */
@media (max-width: 480px) {
    .hero h1 {
        font-size: 1.75rem;
    }

    .tagline {
        font-size: 1rem;
    }

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

    .container {
        padding: 0 15px;
    }

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

    .badge {
        min-width: 120px;
    }

    .badges-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .stat-card h3 {
        font-size: 0.9rem;
    }

    .stat-value {
        font-size: 1.5rem;
    }

    .btn {
        padding: 0.5rem 0.75rem;
        font-size: 0.9rem;
        min-height: auto;
        white-space: nowrap;
    }

    .reso-input-group .btn {
        flex-shrink: 0;
    }
}