/* --- Base & Theming --- */
:root {
    /* Light Mode Colors */
    --bg-light: #F4F7F5;
    --surface-light: #FFFFFF;
    --primary-light: #1F6F5B;
    --on-primary-light: #FFFFFF;
    --text-main-light: #1B2A27;
    --text-secondary-light: #5A6E69;
    --positive-light: #2F8A70;
    --negative-light: #D0453C;
    --accent-light: #E9EEEB;
    --border-light: #D1D9D5;

    /* Dark Mode Colors */
    --bg-dark: #0B1D1A;
    --surface-dark: #142B27;
    --primary-dark: #D4AF37;
    --on-primary-dark: #0B1D1A;
    --text-main-dark: #E3E8E5;
    --text-secondary-dark: #96A39F;
    --positive-dark: #3CB371;
    --negative-dark: #E57373;
    --accent-dark: #1F3A35;
    --border-dark: #2A4F47;
}

html[data-theme="dark"] {
    --bg: var(--bg-dark);
    --surface: var(--surface-dark);
    --primary: var(--primary-dark);
    --on-primary: var(--on-primary-dark);
    --text-main: var(--text-main-dark);
    --text-secondary: var(--text-secondary-dark);
    --positive: var(--positive-dark);
    --negative: var(--negative-dark);
    --accent: var(--accent-dark);
    --border: var(--border-dark);
    --primary-rgb: 212, 175, 55;
}

html[data-theme="light"] {
    --bg: var(--bg-light);
    --surface: var(--surface-light);
    --primary: var(--primary-light);
    --on-primary: var(--on-primary-light);
    --text-main: var(--text-main-light);
    --text-secondary: var(--text-secondary-light);
    --positive: var(--positive-light);
    --negative: var(--negative-light);
    --accent: var(--accent-light);
    --border: var(--border-light);
    --primary-rgb: 31, 111, 91;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg);
    color: var(--text-main);
    transition: background-color 0.3s ease, color 0.3s ease;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden; /* Prevents horizontal scrolling */
    margin: 0;
}

.container, .auth-container {
    background-color: var(--surface);
    color: var(--text-main);
    border-radius: 1rem;
    padding: clamp(1.5rem, 5vw, 2.5rem);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 1080px;
    margin: 1.5rem auto;
    border: 1px solid var(--border);
    box-sizing: border-box; /* Ensures padding is included in width */
}

.auth-body { display: flex; align-items: center; justify-content: center; min-height: 100vh; padding: 1.5rem; box-sizing: border-box; }
.auth-container { max-width: 760px; }

/* --- Typography & Utilities --- */
.text-secondary-text { color: var(--text-secondary); }
.text-positive { color: var(--positive); }
.text-negative { color: var(--negative); }
.hidden { display: none !important; }

/* --- Header & Navigation --- */
.header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 2rem; }
.logo-container { display: flex; align-items: center; gap: 0.75rem; }
.logo-container img { height: 2.25rem; width: 2.25rem; }
.logo-container h1 { font-size: 2rem; font-weight: 700; margin: 0; }

.hamburger-menu { display: none; flex-direction: column; justify-content: space-around; width: 28px; height: 24px; cursor: pointer; z-index: 20; }
.hamburger-menu span { display: block; width: 100%; height: 3px; background-color: var(--text-main); border-radius: 2px; transition: all 0.3s; }
.hamburger-menu.open span:nth-child(1) { transform: translateY(10px) rotate(45deg); }
.hamburger-menu.open span:nth-child(2) { opacity: 0; }
.hamburger-menu.open span:nth-child(3) { transform: translateY(-10px) rotate(-45deg); }
.tab-nav { display: flex; justify-content: center; margin-bottom: 2rem; background-color: var(--accent); border-radius: 0.75rem; padding: 0.5rem; gap: 0.5rem; }
.tab-button { flex-grow: 1; padding: 0.85rem 1rem; border-radius: 0.5rem; background-color: transparent; color: var(--text-secondary); border: none; cursor: pointer; font-weight: 600; transition: all 0.2s; font-size: 1rem; }
.tab-button.active { background-color: var(--primary); color: var(--on-primary); box-shadow: 0 4px 12px rgba(0,0,0,0.1); transform: translateY(-2px); }
.tab-button:not(.active):hover { background-color: rgba(var(--primary-rgb), 0.1); color: var(--text-main); }

/* --- Cards & General Layout --- */
.balance-card { background-color: var(--accent); padding: 2rem; border-radius: 1rem; text-align: center; margin-bottom: 2rem; }
.balance-amount { font-size: clamp(2.25rem, 8vw, 3rem); font-weight: 700; margin-top: 0.5rem; color: var(--primary); }
.summary-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; margin-bottom: 2rem; }
.summary-item { background-color: var(--accent); padding: 1.5rem; border-radius: 1rem; text-align: center; }
.summary-item .amount { font-size: clamp(1.5rem, 5vw, 1.75rem); font-weight: 600; margin-top: 0.25rem; }
.summary-item.income .amount { color: var(--positive); }
.summary-item.expenses .amount { color: var(--negative); }
.list-placeholder, .list-placeholder-small { text-align: center; padding: 3rem 1rem; color: var(--text-secondary); }
.list-placeholder-small { padding: 1.5rem; }
.action-buttons-container { margin-top: 2rem; margin-bottom: 1.5rem; }

/* --- Forms & Inputs --- */
.form-group { margin-bottom: 1.25rem; }
.form-group label { display: block; margin-bottom: 0.5rem; color: var(--text-secondary); font-weight: 500; }
input[type="text"], input[type="email"], input[type="password"], input[type="number"], input[type="date"], select {
    width: 100%;
    padding: 0.85rem;
    border-radius: 0.5rem;
    border: 1px solid var(--border);
    background-color: var(--accent);
    color: var(--text-main);
    transition: all 0.2s;
    box-sizing: border-box;
    font-size: 1rem;
}
input:focus, select:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(var(--primary-rgb), 0.3); }

/* --- Custom Radio Buttons --- */
.radio-group { display: flex; gap: 1rem; align-items: center; }
.radio-group label { display: flex; align-items: center; gap: 0.5rem; cursor: pointer; padding: 0.75rem 1.25rem; border-radius: 0.5rem; border: 2px solid var(--border); transition: all 0.2s; }
.radio-group input[type="radio"] { display: none; }
.radio-group input[type="radio"]:checked + span { color: var(--primary); font-weight: 600; }
.radio-group label:has(input:checked) { border-color: var(--primary); background-color: rgba(var(--primary-rgb), 0.1); }

.add-button { background-color: var(--primary); color: var(--on-primary); width: 100%; padding: 0.85rem; border-radius: 0.5rem; font-weight: 600; cursor: pointer; border: none; transition: all 0.2s; box-shadow: 0 4px 10px rgba(0,0,0,0.1); font-size: 1rem; }
.add-button:hover { transform: translateY(-2px); box-shadow: 0 6px 15px rgba(0,0,0,0.15); }
.delete-button { background: none; border: none; color: var(--text-secondary); cursor: pointer; font-size: 1.5rem; margin-left: 1rem; transition: all 0.2s; padding: 0.5rem; line-height: 1; }
.delete-button:hover { color: var(--negative); transform: scale(1.1); }

.delete-debt-button {
    background: none;
    border: none;
    color: var(--negative);
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 600;
    margin-top: 1.5rem;
    padding: 0.5rem 0;
    transition: all 0.2s;
    text-align: left;
    width: auto;
    display: block;
}
.delete-debt-button:hover { opacity: 0.8; }

.custom-select-wrapper { position: relative; }
.custom-select-wrapper::after { content: '▼'; font-size: 0.8rem; color: var(--text-secondary); position: absolute; right: 1rem; top: 50%; transform: translateY(-50%); pointer-events: none; }
select { appearance: none; -webkit-appearance: none; }

/* --- Transaction & Debt Lists --- */
.transaction-list, .debt-list { list-style: none; padding: 0; margin-top: 2rem; display: flex; flex-direction: column; gap: 1rem; }
.transaction-item { display: flex; justify-content: space-between; align-items: center; background-color: var(--accent); padding: 1rem 1.25rem; border-radius: 0.75rem; border-left: 5px solid; transition: all 0.2s; }
.transaction-item .description { display: flex; flex-direction: column; gap: 0.25rem; }
.transaction-item .tag-label { font-size: 0.8rem; color: var(--text-secondary); font-style: italic; }
.transaction-item .amount { font-weight: 600; font-size: 1.125rem; }
.transaction-item .amount.income { color: var(--positive); }
.transaction-item .amount.expense { color: var(--negative); }

/* --- Debt Tab Overhaul --- */
.debt-item { background-color: var(--accent); border-radius: 1rem; padding: 1.25rem; transition: all 0.2s; }
.debt-item-header { display: flex; justify-content: space-between; align-items: center; cursor: pointer; }
.debt-name { font-weight: 600; font-size: 1.25rem; word-break: break-all; margin-right: 1rem; }
.debt-amount-container { display: flex; align-items: center; gap: 0.75rem; }
.debt-amount { font-weight: 700; font-size: 1.25rem; color: var(--negative); }
.expand-button { background: none; border: none; color: var(--text-secondary); cursor: pointer; font-size: 1.2rem; transition: all 0.2s; }
.debt-details { margin-top: 1.25rem; padding-top: 1.25rem; border-top: 1px solid var(--border); display: none; }
.debt-details.expanded { display: block; }
.progress-bar-container { height: 10px; background-color: var(--border); border-radius: 5px; overflow: hidden; margin: 1rem 0 0.25rem; }
.progress-bar { height: 100%; background-color: var(--positive); border-radius: 5px; transition: width 0.5s ease; width: 0%; }
.debt-apr-display { font-size: 0.875rem; color: var(--text-secondary); margin-top: 0.25rem; }
.sub-heading { font-weight: 600; margin-top: 2rem; margin-bottom: 1rem; color: var(--primary); font-size: 1.125rem; }
.debt-transactions-list { list-style: none; padding: 0; margin-top: 0.5rem; font-size: 0.9rem; display: flex; flex-direction: column; gap: 0.75rem; }
.debt-transactions-list li { display: flex; justify-content: space-between; align-items: center; }
.debt-tx-info { display: flex; align-items: center; gap: 0.75rem; }
.tag-color-swatch-small { width: 0.85rem; height: 0.85rem; border-radius: 50%; flex-shrink: 0; }
.debt-transactions-list .payment { color: var(--positive); }
.debt-transactions-list .increase { color: var(--negative); }
.debt-transaction-delete-button { background: none; border: none; color: var(--text-secondary); cursor: pointer; font-size: 1.25rem; transition: all 0.2s; padding: 0.25rem; }
.debt-transaction-delete-button:hover { color: var(--negative); }

/* --- History Controls --- */
.history-controls { display: flex; justify-content: space-between; align-items: center; margin-top: 2.5rem; margin-bottom: 1.5rem; flex-wrap: wrap; gap: 1rem; }
.filter-buttons, .sort-buttons { display: flex; gap: 0.5rem; }
.filter-buttons button, .sort-buttons button { background-color: var(--accent); color: var(--text-secondary); padding: 0.6rem 1.1rem; border-radius: 0.5rem; border: 1px solid var(--border); cursor: pointer; transition: all 0.2s; font-size: 0.875rem; }
.filter-buttons button.active, .sort-buttons button.active { background-color: var(--primary); color: var(--on-primary); border-color: var(--primary); }

/* --- Settings & Tags --- */
.settings-option { margin-bottom: 2rem; padding-bottom: 2rem; border-bottom: 1px solid var(--border); }
.settings-option:last-child { border-bottom: none; }
.settings-option h3 { font-weight: 600; margin-bottom: 1rem; color: var(--primary); font-size: 1.25rem; }
.tag-list-container { display: flex; flex-direction: column; gap: 0.75rem; }
.tag-item { display: flex; justify-content: space-between; align-items: center; background-color: var(--accent); padding: 0.75rem 1rem; border-radius: 0.5rem; }
.tag-color-swatch { width: 1.5rem; height: 1.5rem; border-radius: 50%; margin-right: 0.75rem; border: 1px solid rgba(0,0,0,0.1); flex-shrink: 0; }
#add-tag-form .flex-grow { flex-grow: 1; }
#add-tag-form .flex { display: flex; align-items: flex-end; gap: 0.75rem; }

/* --- Recurring Options --- */
.checkbox-label { display: flex; align-items: center; gap: 0.75rem; cursor: pointer; font-weight: 500; color: var(--text-secondary); }
.recurring-options { padding: 1.25rem; margin-top: 1.25rem; border: 1px solid var(--border); border-radius: 0.75rem; background-color: var(--accent); }
#recurring-list-container { display: flex; flex-direction: column; gap: 0.75rem; }
.recurring-item-manage { display: flex; justify-content: space-between; align-items: center; background-color: var(--accent); padding: 1rem 1.25rem; border-radius: 0.75rem; }
.recurring-item-info { display: flex; flex-direction: column; gap: 0.25rem; }
.recurring-item-info .description { font-weight: 600; }
.recurring-item-info .details { font-size: 0.875rem; color: var(--text-secondary); }
.recurring-item-info .details .amount.income, .recurring-item-info .details .amount.payment { color: var(--positive); }
.recurring-item-info .details .amount.expense, .recurring-item-info .details .amount.increase { color: var(--negative); }

/* --- Insights & Charts --- */
.chart-container { background-color: var(--accent); padding: 1.5rem; border-radius: 1rem; margin-bottom: 1.5rem; }
.summary-bar { height: 2rem; border-radius: 0.35rem; background-color: var(--surface); position: relative; overflow: hidden; display: flex; justify-content: space-between; align-items: center; padding: 0 1rem; font-size: 0.875rem; font-weight: 600; margin-bottom: 0.5rem; }
.summary-bar::before { content: ''; position: absolute; top: 0; left: 0; height: 100%; width: var(--bar-width, 0%); border-radius: 0.35rem; transition: width 0.5s ease; z-index: 1; background-color: var(--bar-color, var(--primary)); }
.bar-label, .bar-amount { position: relative; z-index: 2; color: var(--text-main); text-shadow: 0 0 5px var(--bg); }

/* --- Modals --- */
.modal-overlay { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background-color: rgba(0,0,0,0.6); display: flex; justify-content: center; align-items: center; z-index: 100; opacity: 0; visibility: hidden; transition: all 0.3s; backdrop-filter: blur(5px); }
.modal-overlay.visible { opacity: 1; visibility: visible; }
.modal-content { background-color: var(--surface); padding: 2rem; border-radius: 1rem; box-shadow: 0 10px 30px rgba(0,0,0,0.2); max-width: 420px; width: 90%; text-align: center; transform: scale(0.95); transition: transform 0.3s; }
.modal-content.form-modal { text-align: left; }
.modal-content .modal-title { font-size: 1.5rem; font-weight: 700; margin-bottom: 1.5rem; color: var(--primary); text-align: center; }
.modal-overlay.visible .modal-content { transform: scale(1); }
.modal-content p { margin-bottom: 1.5rem; color: var(--text-main); line-height: 1.6; }
.modal-buttons { display: flex; flex-direction: column; justify-content: center; gap: 0.75rem; margin-top: 1.5rem; }
.modal-button { padding: 0.85rem 1.5rem; border-radius: 0.5rem; font-weight: 600; cursor: pointer; border: none; transition: all 0.2s; }
.modal-button.confirm { background-color: var(--primary); color: var(--on-primary); }
.modal-button.cancel { background-color: var(--accent); color: var(--text-main); }

/* --- Footer --- */
footer { text-align: center; color: var(--text-secondary); font-size: 0.875rem; margin-top: 4rem; }

/* --- Responsive Design --- */
@media (max-width: 768px) {
    .auth-body {
        padding: 0;
    }
    .container, .auth-container {
        margin: 0;
        border-radius: 0;
        min-height: 100vh;
        width: 100%;
        border: none;
        padding: 1.5rem;
        box-sizing: border-box;
        padding-bottom: 6rem; /* Ensure space for footer/nav */
    }
    .auth-container {
        margin: 0;
        border-radius: 0;
        min-height: 100vh;
        width: 100%;
        border: none;
        padding: 2rem 1.5rem;
        box-sizing: border-box;
        display: flex;
        flex-direction: column;
        justify-content: center;
    }
    .auth-container footer {
        margin-top: auto;
        padding-top: 2rem;
    }
    .hamburger-menu { display: flex; }
    .tab-nav {
        flex-direction: column;
        justify-content: center;
        align-items: center;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background-color: var(--surface);
        z-index: 10;
        transform: translateX(100%);
        transition: transform 0.3s ease-in-out;
        margin-bottom: 0;
        border-radius: 0;
        padding: 2rem;
        gap: 1.5rem;
    }
    .tab-nav.open { transform: translateX(0); }
    .tab-nav .tab-button {
        font-size: 1.5rem;
        padding: 1rem 2rem;
        width: 80%;
        max-width: 300px;
        text-align: center;
        flex-grow: 0;
    }
    .history-controls { flex-direction: column; align-items: stretch; gap: 1.5rem; }
    #add-tag-form .flex { flex-direction: column; align-items: stretch; gap: 1rem; }
    #add-tag-form .add-button { margin-top: 0; }
    .summary-grid { gap: 1rem; }
    .balance-card, .summary-item, .debt-item, .chart-container { padding: 1.5rem; }
}