body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    min-height: 100vh;
    margin: 0;
    padding: 0;
    color: var(--text-color);
}

:root {
    --bg-color: #fff;
    --text-color: #333;
    --sidebar-bg: linear-gradient(45deg, #f8f9fa, #e9ecef);
    --card-bg: #e9ecef;
    --badge-bg: linear-gradient(45deg, #007bff, #0056b3);
    --button-bg: linear-gradient(45deg, #007bff, #0056b3);
    --delete-bg: linear-gradient(45deg, #dc3545, #c82333);
    --input-bg: #fff;
    --input-border: #ddd;
    --shadow: rgba(0, 0, 0, 0.2);
    --sidebar-text: #333;
}

[data-theme="dark"] {
    --bg-color: #1a1a1a;
    --text-color: #e0e0e0;
    --sidebar-bg: linear-gradient(45deg, #2d2d2d, #3a3a3a);
    --card-bg: #2d2d2d;
    --badge-bg: linear-gradient(45deg, #4a90e2, #357abd);
    --button-bg: linear-gradient(45deg, #4a90e2, #357abd);
    --delete-bg: linear-gradient(45deg, #e74c3c, #c0392b);
    --input-bg: #333;
    --input-border: #555;
    --shadow: rgba(0, 0, 0, 0.5);
    --sidebar-text: #e0e0e0;
}

[data-theme="dark"] body {
    /* No background for full screen */
}

@keyframes backgroundShift {
    0% {
        background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    }

    100% {
        background: linear-gradient(135deg, #764ba2 0%, #667eea 100%);
    }
}

[data-theme="dark"] @keyframes backgroundShift {
    0% {
        background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
    }

    100% {
        background: linear-gradient(135deg, #34495e 0%, #2c3e50 100%);
    }
}

.container {
    display: flex;
    flex-direction: column;
    width: 100vw;
    height: 100vh;
    padding: 20px;
    background: var(--bg-color);
    animation: slideIn 0.5s ease-out;
    position: relative;
    overflow-y: auto;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-20px) scale(0.95);
    }

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

.main {
    flex: 1;
}

#theme-toggle {
    position: absolute;
    top: 20px;
    right: 20px;
    background: var(--button-bg);
    color: white;
    border: none;
    padding: 10px 15px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 14px;
}

#theme-toggle:hover {
    transform: scale(1.05);
    box-shadow: 0 5px 15px var(--shadow);
}

.sidebar {
    background: var(--sidebar-bg);
    border-radius: 8px;
    padding: 15px;
    margin-top: 20px;
    box-shadow: 0 2px 10px var(--shadow);
    animation: fadeInUp 0.6s ease-out;
    color: var(--sidebar-text);
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

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

.sidebar h3 {
    margin-top: 0;
    color: #333;
    background: linear-gradient(45deg, #333, #555);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

h1 {
    text-align: center;
    background: linear-gradient(45deg, #667eea, #764ba2, #f093fb, #f5576c);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 20px;
    font-weight: 300;
    animation: rainbowText 3s ease-in-out infinite;
}

@keyframes rainbowText {
    0% {
        filter: hue-rotate(0deg);
    }

    50% {
        filter: hue-rotate(180deg);
    }

    100% {
        filter: hue-rotate(360deg);
    }
}

form input,
form select,
form button {
    margin: 5px 0;
    padding: 10px;
    width: 100%;
    box-sizing: border-box;
    border: 1px solid var(--input-border);
    border-radius: 8px;
    transition: all 0.3s ease;
    background: var(--input-bg);
    color: var(--text-color);
}

form input:focus,
form select:focus {
    border-color: #007bff;
    box-shadow: 0 0 10px rgba(0, 123, 255, 0.5);
    outline: none;
    transform: scale(1.02);
}

form button {
    cursor: pointer;
    background: var(--button-bg);
    color: white;
    border: none;
    border-radius: 8px;
    font-weight: bold;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

form button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

form button:hover::before {
    left: 100%;
}

form button:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 8px 25px rgba(0, 123, 255, 0.4);
}

form button:active {
    transform: translateY(-1px) scale(1.02);
    animation: buttonPress 0.1s ease;
}

@keyframes buttonPress {
    0% {
        transform: scale(1);
    }

    50% {
        transform: scale(0.98);
    }

    100% {
        transform: scale(1.02);
    }
}

.currency {
    margin-top: 20px;
    padding: 15px;
    background: var(--sidebar-bg);
    border-radius: 8px;
    box-shadow: 0 2px 10px var(--shadow);
    animation: slideInLeft 0.5s ease-out;
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }

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

.currency label {
    font-weight: bold;
    color: var(--sidebar-text);
}

.currency select {
    margin-top: 5px;
    transition: all 0.3s ease;
}

.currency select:focus {
    transform: scale(1.02);
}

/* Expense List Cards */
#expense-list .card {
    background: var(--card-bg);
    padding: 15px;
    margin: 10px 0;
    border-radius: 10px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 5px var(--shadow);
    transition: all 0.3s ease;
    animation: fadeInBounce 0.6s ease-out;
    position: relative;
    overflow: hidden;
    color: var(--text-color);
}

@keyframes fadeInBounce {
    0% {
        opacity: 0;
        transform: translateY(20px) scale(0.9);
    }

    50% {
        opacity: 0.5;
        transform: translateY(-5px) scale(1.05);
    }

    100% {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

#expense-list .card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    transition: left 0.5s;
}

#expense-list .card:hover::before {
    left: 100%;
}

#expense-list .card:hover {
    transform: translateY(-8px) rotate(1deg);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
}

#expense-list .card.fade-out {
    animation: fadeOut 0.5s ease-out forwards;
}

@keyframes fadeOut {
    to {
        opacity: 0;
        transform: translateY(-20px) scale(0.9);
    }
}

/* Category-specific colors */
.card-food {
    background: linear-gradient(45deg, #d4edda, #c3e6cb);
    border-left: 5px solid #28a745;
    box-shadow: 0 2px 5px rgba(40, 167, 69, 0.2);
}

.card-travel {
    background: linear-gradient(45deg, #cce5ff, #b3d9ff);
    border-left: 5px solid #007bff;
    box-shadow: 0 2px 5px rgba(0, 123, 255, 0.2);
}

.card-marketing {
    background: linear-gradient(45deg, #fff3cd, #ffeaa7);
    border-left: 5px solid #ffc107;
    box-shadow: 0 2px 5px rgba(255, 193, 7, 0.2);
}

.card-utilities {
    background: linear-gradient(45deg, #e2e3e5, #d6d8db);
    border-left: 5px solid #6c757d;
    box-shadow: 0 2px 5px rgba(108, 117, 125, 0.2);
}

.card-other {
    background: linear-gradient(45deg, #f8f9fa, #e9ecef);
    border-left: 5px solid #17a2b8;
    box-shadow: 0 2px 5px rgba(23, 162, 184, 0.2);
}

#expense-list button {
    background: var(--delete-bg);
    color: white;
    border: none;
    padding: 8px 12px;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
}

#expense-list button::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.3s, height 0.3s;
}

#expense-list button:hover::before {
    width: 20px;
    height: 20px;
}

#expense-list button:hover {
    transform: scale(1.15) rotate(5deg);
    box-shadow: 0 5px 15px rgba(220, 53, 69, 0.5);
}

#expense-list button:active {
    transform: scale(1.1) rotate(0deg);
    animation: buttonShake 0.2s ease;
}

@keyframes buttonShake {

    0%,
    100% {
        transform: scale(1.1) rotate(0deg);
    }

    25% {
        transform: scale(1.1) rotate(-5deg);
    }

    75% {
        transform: scale(1.1) rotate(5deg);
    }
}

/* Badges for total and converted */
.badge {
    display: inline-block;
    padding: 8px 15px;
    border-radius: 20px;
    font-weight: bold;
    background: var(--badge-bg);
    color: white;
    transition: all 0.3s ease;
    animation: pulse 2s infinite, badgeGlow 3s ease-in-out infinite alternate;
    position: relative;
}

@keyframes badgeGlow {
    0% {
        filter: brightness(1);
    }

    100% {
        filter: brightness(1.2);
    }
}

@keyframes pulse {
    0% {
        box-shadow: 0 0 0 0 rgba(0, 123, 255, 0.7);
        transform: scale(1);
    }

    50% {
        box-shadow: 0 0 0 10px rgba(0, 123, 255, 0);
        transform: scale(1.05);
    }

    100% {
        box-shadow: 0 0 0 0 rgba(0, 123, 255, 0);
        transform: scale(1);
    }
}

.badge.update {
    animation: badgeUpdate 0.5s ease;
}

@keyframes badgeUpdate {
    0% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.2);
    }

    100% {
        transform: scale(1);
    }
}

/* Hover effect for fun (optional) */
.badge:hover {
    transform: scale(1.1);
    background: linear-gradient(45deg, #0056b3, #004085);
    animation-play-state: paused;
}

/* Summary section */
#summary {
    margin: 20px 0;
    padding: 15px;
    background: var(--sidebar-bg);
    border-radius: 10px;
    box-shadow: 0 2px 10px var(--shadow);
    animation: summarySlide 0.5s ease-out;
}

@keyframes summarySlide {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }

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

#summary h3 {
    margin: 10px 0;
    color: var(--sidebar-text);
}

/* Breakdown */
#breakdown p {
    margin: 5px 0;
    padding: 8px;
    background: var(--bg-color);
    border-radius: 5px;
    box-shadow: 0 1px 3px var(--shadow);
    transition: all 0.3s ease;
    animation: breakdownFade 0.4s ease-out;
    color: var(--text-color);
}

@keyframes breakdownFade {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

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

#breakdown p:hover {
    transform: translateX(5px);
    box-shadow: 0 3px 8px var(--shadow);
}

/* Category-specific breakdown colors */
.breakdown-food {
    background: linear-gradient(45deg, #d4edda, #c3e6cb);
    border-left: 3px solid #28a745;
}

.breakdown-travel {
    background: linear-gradient(45deg, #cce5ff, #b3d9ff);
    border-left: 3px solid #007bff;
}

.breakdown-marketing {
    background: linear-gradient(45deg, #fff3cd, #ffeaa7);
    border-left: 3px solid #ffc107;
}

.breakdown-utilities {
    background: linear-gradient(45deg, #e2e3e5, #d6d8db);
    border-left: 3px solid #6c757d;
}

.breakdown-other {
    background: linear-gradient(45deg, #f8f9fa, #e9ecef);
    border-left: 3px solid #17a2b8;
}

/* Converted text */
#converted {
    font-weight: bold;
    color: #007bff;
    animation: textGlow 2s ease-in-out infinite alternate;
}

@keyframes textGlow {
    0% {
        text-shadow: 0 0 5px rgba(0, 123, 255, 0.5);
    }

    100% {
        text-shadow: 0 0 15px rgba(0, 123, 255, 0.8);
    }
}

/* No expenses message */
#expense-list p {
    text-align: center;
    color: var(--sidebar-text);
    font-style: italic;
    animation: fadeIn 1s ease-out;
}

/* Responsive Design */
@media (max-width: 767px) {
    .container {
        padding: 15px;
    }

    h1 {
        font-size: 1.5em;
    }

    #theme-toggle {
        position: static;
        display: block;
        margin: 10px auto 20px;
        padding: 12px 16px;
        font-size: 14px;
        width: auto;
        max-width: 200px;
    }

    form input,
    form select {
        padding: 12px;
        font-size: 16px;
        /* Prevent zoom on iOS, good for Android too */
    }

    form button {
        padding: 12px;
        font-size: 1.1em;
    }

    #expense-list button {
        padding: 8px 12px;
    }

    .sidebar {
        margin-top: 15px;
        padding: 10px;
    }

    .badge {
        padding: 6px 12px;
        font-size: 0.9em;
    }

    #expense-list .card {
        padding: 10px;
    }
}

@media (min-width: 768px) and (max-width: 1023px) {
    .container {
        flex-direction: row;
        max-width: 900px;
        padding: 20px;
    }

    .main {
        flex: 2;
        margin-right: 20px;
    }

    .sidebar {
        flex: 1;
        margin-top: 0;
    }
}

@media (min-width: 1024px) {
    .container {
        flex-direction: row;
        max-width: 1000px;
    }

    .main {
        flex: 2;
        margin-right: 20px;
    }

    .sidebar {
        flex: 1;
        margin-top: 0;
    }
}