:root {
    --bg-color: #ffffff;
    --text-color: #000000;
    --accent-color: #007AFF;
    --success-color: #34C759;
    --expense-color: #FF3B30;
    --secondary-bg: #F2F2F7;
    --border-color: #C6C6C8;
    --muted-text: #8E8E93;
    --nav-bg: rgba(255, 255, 255, 0.85);
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #000000;
        --text-color: #FFFFFF;
        --secondary-bg: #1C1C1E;
        --border-color: #38383A;
        --muted-text: #8E8E93;
        --nav-bg: rgba(28, 28, 30, 0.85);
    }
}

[data-theme="dark"] {
    --bg-color: #000000;
    --text-color: #FFFFFF;
    --secondary-bg: #1C1C1E;
    --border-color: #38383A;
    --muted-text: #8E8E93;
    --nav-bg: rgba(28, 28, 30, 0.85);
}

[data-theme="light"] {
    --bg-color: #ffffff;
    --text-color: #000000;
    --secondary-bg: #F2F2F7;
    --border-color: #C6C6C8;
    --muted-text: #8E8E93;
    --nav-bg: rgba(255, 255, 255, 0.85);
}

* {
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
    -webkit-font-smoothing: antialiased;
}

html, body {
    margin: 0;
    padding: 0;
    height: 100%;
    width: 100%;
    overflow: hidden;
    overflow-x: hidden;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", system-ui, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.4;
    user-select: none;
}

#app {
    display: flex;
    flex-direction: column;
    height: 100%;
    width: 100%;
    overflow: hidden;
}

main {
    flex: 1;
    padding: 0 16px 80px 16px;
    overflow-y: auto;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
}

main::-webkit-scrollbar {
    display: none;
}

header {
    padding: 50px 0 20px 0;
    background-color: var(--bg-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

h1 {
    font-size: 34px;
    font-weight: 700;
    margin: 0;
    letter-spacing: -1px;
}

h2 {
    font-size: 40px;
    font-weight: 700;
    margin: 5px 0;
    letter-spacing: -1px;
}

h3 {
    font-size: 17px;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--text-color);
}

.label {
    font-size: 13px;
    font-weight: 600;
    color: var(--muted-text);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Dashboard Cards */
.balance-card {
    background-color: var(--secondary-bg);
    padding: 24px;
    border-radius: 20px;
    margin-bottom: 16px;
}

.summary-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-bottom: 24px;
}

.summary-item {
    background-color: var(--secondary-bg);
    padding: 16px;
    border-radius: 20px;
}

.summary-item.income h3 { color: var(--success-color); font-size: 22px; margin: 5px 0 0 0; }
.summary-item.expense h3 { color: var(--expense-color); font-size: 22px; margin: 5px 0 0 0; }

/* Bottom Nav */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    background-color: var(--nav-bg);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    display: flex;
    justify-content: space-evenly;
    align-items: center;
    height: 70px;
    border-top: 0.5px solid var(--border-color);
    z-index: 1000;
    margin: 0;
    padding: 0;
}

.nav-item {
    background: none;
    border: none;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--muted-text);
    cursor: pointer;
    font-size: 9px;
    font-weight: 500;
    padding: 4px;
    min-width: 50px;
    max-width: 60px;
}

.nav-item.active {
    color: var(--accent-color);
}

.nav-item .icon {
    font-size: 22px;
    margin-bottom: 2px;
}

.nav-item .label {
    font-size: 9px;
    text-transform: none;
    letter-spacing: 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.nav-btn-plus {
    background-color: var(--text-color);
    color: var(--bg-color);
    width: 50px;
    height: 50px;
    border-radius: 25px;
    border: none;
    font-size: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    flex-shrink: 0;
}

.nav-btn-plus:active {
    transform: scale(0.95);
}

/* Sections */
.view {
    display: none;
}

.view.active {
    display: block;
    animation: fadeIn 0.3s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* Forms */
.input-group {
    margin-bottom: 24px;
}

.input-group label {
    display: block;
    font-size: 15px;
    font-weight: 500;
    margin-bottom: 8px;
    padding-left: 4px;
}

input, select {
    width: 100%;
    padding: 14px 16px;
    border: none;
    border-radius: 12px;
    background-color: var(--secondary-bg);
    color: var(--text-color);
    font-size: 17px;
    outline: none;
    -webkit-appearance: none;
}

.type-toggle {
    display: flex;
    background-color: var(--secondary-bg);
    border-radius: 14px;
    padding: 3px;
}

.type-toggle input {
    display: none;
}

.type-toggle label {
    flex: 1;
    text-align: center;
    padding: 10px;
    margin: 0;
    border-radius: 11px;
    cursor: pointer;
    font-weight: 600;
    font-size: 15px;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.type-toggle input:checked + label {
    background-color: var(--bg-color);
    color: var(--text-color);
    box-shadow: 0 3px 8px rgba(0,0,0,0.12);
}

.submit-btn {
    width: 100%;
    padding: 18px;
    background-color: var(--text-color);
    color: var(--bg-color);
    border: none;
    border-radius: 16px;
    font-size: 17px;
    font-weight: 600;
    margin-top: 20px;
    cursor: pointer;
}

.secondary-btn {
    width: 100%;
    padding: 14px;
    background-color: var(--secondary-bg);
    color: var(--text-color);
    border: none;
    border-radius: 12px;
    margin-bottom: 12px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
}

.danger-btn {
    width: 100%;
    padding: 14px;
    background-color: transparent;
    color: var(--expense-color);
    border: none;
    border-radius: 12px;
    margin-top: 20px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
}

/* List */
.list-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 4px;
    border-bottom: 0.5px solid var(--border-color);
}

.list-item:active {
    background-color: var(--secondary-bg);
    border-radius: 10px;
}

.list-item .info {
    flex: 1;
}

.list-item .category {
    font-weight: 600;
    font-size: 17px;
    margin-bottom: 2px;
}

.list-item .note {
    font-size: 14px;
    color: var(--muted-text);
}

.list-item .date {
    font-size: 13px;
    color: var(--muted-text);
    margin-top: 2px;
}

.list-item .amount {
    font-weight: 700;
    font-size: 18px;
}

.amount.income { color: var(--success-color); }
.amount.expense { color: var(--text-color); }

/* Switch Toggle */
.switch {
    position: relative;
    display: inline-block;
    width: 51px;
    height: 31px;
}

.switch input { display: none; }

.slider {
    position: absolute;
    cursor: pointer;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: #E9E9EB;
    transition: .3s;
}

.slider:before {
    position: absolute;
    content: "";
    height: 27px; width: 27px;
    left: 2px; bottom: 2px;
    background-color: white;
    box-shadow: 0 3px 8px rgba(0,0,0,0.15);
    transition: .3s;
}

input:checked + .slider { background-color: var(--success-color); }
input:checked + .slider:before { transform: translateX(20px); }
.slider.round { border-radius: 31px; }
.slider.round:before { border-radius: 50%; }

/* Settings */
.settings-list {
    background-color: var(--secondary-bg);
    border-radius: 12px;
    padding: 0 16px;
}

.settings-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 0;
    border-bottom: 0.5px solid var(--border-color);
}

.settings-item:last-child {
    border-bottom: none;
}

.close-btn {
    background: var(--secondary-bg);
    border: none;
    font-size: 18px;
    color: var(--text-color);
    cursor: pointer;
    width: 32px;
    height: 32px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.chart-container {
    background-color: var(--secondary-bg);
    padding: 20px;
    border-radius: 20px;
    margin-top: 20px;
}

/* Search */
.search-bar {
    margin-bottom: 20px;
}

.search-bar input {
    background-color: var(--secondary-bg);
    border-radius: 10px;
    padding: 10px 16px;
}