/* Base Styles */
:root {
    /* Fluent Dark Theme (Default) */
    --bg-color: #202020;
    --sidebar-bg: #1a1a1a;
    --card-bg: #2d2d2d;
    --button-bg: #3b3b3b;
    --button-hover: #4a4a4a;
    --accent-color: #60cdff;
    --accent-hover: #7dd5ff;
    --text-color: #ffffff;
    --text-secondary: #a0a0a0;
    --border-color: #404040;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

[data-theme="fluent-light"] {
    --bg-color: #f3f3f3;
    --sidebar-bg: #e8e8e8;
    --card-bg: #ffffff;
    --button-bg: #f6f6f6;
    --button-hover: #e9e9e9;
    --accent-color: #0078d4;
    --accent-hover: #106ebe;
    --text-color: #1a1a1a;
    --text-secondary: #666666;
    --border-color: #e0e0e0;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

[data-theme="midnight-blue"] {
    --bg-color: #0a1628;
    --sidebar-bg: #081220;
    --card-bg: #12203a;
    --button-bg: #1a2d4d;
    --button-hover: #243b5c;
    --accent-color: #4dabf7;
    --accent-hover: #5ebaf8;
    --text-color: #e8f1ff;
    --text-secondary: #8b9dc3;
    --border-color: #1e3a5f;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
}

[data-theme="forest-green"] {
    --bg-color: #1a2e1a;
    --sidebar-bg: #142414;
    --card-bg: #243824;
    --button-bg: #2e452e;
    --button-hover: #3a553a;
    --accent-color: #69db7c;
    --accent-hover: #7de08f;
    --text-color: #e8f5e8;
    --text-secondary: #8baf8b;
    --border-color: #3a5a3a;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

[data-theme="sunset-orange"] {
    --bg-color: #2a1a14;
    --sidebar-bg: #221410;
    --card-bg: #3a2418;
    --button-bg: #4d3020;
    --button-hover: #5d3a28;
    --accent-color: #ff922b;
    --accent-hover: #ffa03c;
    --text-color: #fff3e6;
    --text-secondary: #c4956a;
    --border-color: #5a3a28;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

[data-theme="royal-purple"] {
    --bg-color: #1e1432;
    --sidebar-bg: #181028;
    --card-bg: #2a1e42;
    --button-bg: #3a2a55;
    --button-hover: #483568;
    --accent-color: #b197fc;
    --accent-hover: #c4a8fd;
    --text-color: #f0e6ff;
    --text-secondary: #9b8bb4;
    --border-color: #4a3568;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

[data-theme="rose-gold"] {
    --bg-color: #2a1e24;
    --sidebar-bg: #22181c;
    --card-bg: #3a2832;
    --button-bg: #4d3440;
    --button-hover: #5d3f4c;
    --accent-color: #f783ac;
    --accent-hover: #f993b8;
    --text-color: #ffe6f0;
    --text-secondary: #c495a8;
    --border-color: #5a3a48;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

[data-theme="arctic-white"] {
    --bg-color: #f8f9fa;
    --sidebar-bg: #e9ecef;
    --card-bg: #ffffff;
    --button-bg: #e9ecef;
    --button-hover: #dee2e6;
    --accent-color: #228be6;
    --accent-hover: #339af0;
    --text-color: #212529;
    --text-secondary: #868e96;
    --border-color: #ced4da;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

[data-theme="cyber-yellow"] {
    --bg-color: #1a180a;
    --sidebar-bg: #141208;
    --card-bg: #2a2610;
    --button-bg: #3d3818;
    --button-hover: #4d4620;
    --accent-color: #ffd43b;
    --accent-hover: #ffe05c;
    --text-color: #fff8e6;
    --text-secondary: #c4b86a;
    --border-color: #5a5228;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--bg-color);
    color: var(--text-color);
    min-height: 100vh;
    overflow: hidden;
}

.container {
    display: grid;
    grid-template-columns: 220px 1fr 220px;
    height: 100vh;
}

.container.memory-panel-hidden {
    grid-template-columns: 220px 1fr 0;
}

/* Sidebar */
.sidebar {
    background: var(--sidebar-bg);
    padding: 30px 20px;
    display: flex;
    flex-direction: column;
    border-right: 1px solid var(--border-color);
}

.app-title {
    font-size: 24px;
    font-weight: bold;
    margin-bottom: 20px;
    color: var(--text-color);
}

.separator {
    height: 1px;
    background: var(--border-color);
    margin: 10px 0;
}

.nav-buttons {
    display: flex;
    flex-direction: column;
    gap: 6px;
    flex: 1;
}

.nav-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 14px;
    background: transparent;
    border: none;
    border-radius: 8px;
    color: var(--text-color);
    font-size: 14px;
    cursor: pointer;
    transition: all 0.2s;
    text-align: left;
}

.nav-btn:hover {
    background: var(--button-hover);
}

.nav-btn.active {
    background: var(--accent-color);
    color: #000;
}

.nav-icon {
    font-size: 18px;
}

.theme-selector {
    margin-top: auto;
}

.theme-selector label {
    display: block;
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 5px;
}

.theme-selector select {
    width: 100%;
    padding: 8px;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    background: var(--button-bg);
    color: var(--text-color);
    font-size: 13px;
    cursor: pointer;
}

/* Content Area */
.content {
    background: var(--bg-color);
    padding: 20px;
    overflow-y: auto;
}

.mode-view {
    display: none;
    max-width: 800px;
    margin: 0 auto;
}

.mode-view.active {
    display: block;
}

.mode-title {
    text-align: center;
    font-size: 22px;
    font-weight: bold;
    margin-bottom: 20px;
    color: var(--text-color);
}

/* Display */
.display {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 20px;
    min-height: 140px;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    box-shadow: var(--shadow);
}

.display.minimalist {
    background: transparent;
    box-shadow: none;
    text-align: center;
}

.expression {
    font-size: 18px;
    color: var(--text-secondary);
    min-height: 24px;
    text-align: right;
    margin-bottom: 8px;
}

.result {
    font-size: 48px;
    font-weight: bold;
    color: var(--text-color);
    text-align: right;
}

.display.minimalist .result {
    font-size: 56px;
}

.display.minimalist .expression {
    font-size: 16px;
    margin-top: 8px;
}

/* Base Indicators (Programmer) */
.base-indicators {
    display: flex;
    gap: 16px;
    margin-top: 12px;
    font-size: 11px;
    color: var(--text-secondary);
}

/* Buttons Grid */
.buttons-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
}

.buttons-grid.scientific {
    grid-template-columns: repeat(5, 1fr);
}

.buttons-grid.programmer {
    grid-template-columns: repeat(5, 1fr);
}

.buttons-grid.minimalist {
    max-width: 400px;
    margin: 0 auto;
}

.btn, .mem-btn {
    padding: 16px;
    border: none;
    border-radius: 8px;
    font-size: 20px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.15s;
    background: var(--button-bg);
    color: var(--text-color);
}

.btn:hover, .mem-btn:hover {
    background: var(--button-hover);
    transform: translateY(-2px);
}

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

.btn.operator {
    background: var(--button-bg);
    color: var(--accent-color);
}

.btn.equals {
    background: var(--accent-color);
    color: #000;
}

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

.mem-btn {
    font-size: 14px;
    font-weight: normal;
    color: var(--text-secondary);
    background: transparent;
    padding: 8px;
}

.sci-btn {
    font-size: 14px;
}

.min-btn {
    padding: 20px;
    font-size: 24px;
    background: transparent;
    border: 1px solid var(--border-color);
}

.min-btn:hover {
    background: var(--button-hover);
    border-color: var(--accent-color);
}

.min-btn.operator {
    color: var(--accent-color);
}

.min-btn.equals {
    background: var(--accent-color);
    color: #000;
    border-color: var(--accent-color);
}

.prog-btn {
    font-size: 14px;
    background: var(--button-bg);
}

/* Currency Converter */
.currency-input-group {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.currency-input-group label {
    font-size: 14px;
    color: var(--text-secondary);
}

.currency-input-group input {
    flex: 1;
    padding: 10px 14px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background: var(--card-bg);
    color: var(--text-color);
    font-size: 16px;
}

.currency-selector {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
}

.currency-display {
    flex: 1;
    background: var(--button-bg);
    border-radius: 8px;
    padding: 12px;
    text-align: center;
    cursor: pointer;
}

.currency-code {
    font-size: 18px;
    font-weight: bold;
}

.swap-btn {
    background: var(--accent-color);
    border: none;
    border-radius: 8px;
    padding: 10px;
    font-size: 20px;
    cursor: pointer;
    color: #fff;
}

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

.currency-result {
    text-align: center;
    font-size: 28px;
    font-weight: bold;
    color: var(--accent-color);
    margin: 20px 0;
    white-space: pre-line;
}

.search-container {
    margin-bottom: 12px;
}

.search-container input {
    width: 100%;
    padding: 10px 14px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background: var(--card-bg);
    color: var(--text-color);
    font-size: 14px;
}

.currency-list {
    background: var(--bg-color);
    border-radius: 8px;
    max-height: 300px;
    overflow-y: auto;
    margin-bottom: 12px;
}

.currency-item {
    display: flex;
    align-items: center;
    padding: 8px 12px;
    gap: 12px;
    cursor: pointer;
    transition: background 0.15s;
}

.currency-item:hover {
    background: var(--button-bg);
}

.currency-item .currency-icon {
    width: 24px;
    text-align: center;
    font-weight: bold;
    color: var(--accent-color);
}

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

.currency-item .currency-name {
    font-size: 13px;
    font-weight: 500;
}

.currency-item .currency-rate {
    font-size: 12px;
    color: var(--text-secondary);
}

.currency-select-mode {
    display: flex;
    gap: 16px;
    justify-content: center;
}

.currency-select-mode label {
    font-size: 13px;
    color: var(--text-secondary);
    cursor: pointer;
}

/* Metric Converter */
.converter-type-selector {
    margin-bottom: 20px;
}

.converter-type-selector select {
    width: 100%;
    padding: 10px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background: var(--card-bg);
    color: var(--text-color);
    font-size: 14px;
}

.converter-container {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 16px;
    align-items: center;
    margin-bottom: 20px;
}

.converter-side {
    background: var(--card-bg);
    border-radius: 8px;
    padding: 16px;
    text-align: center;
}

.converter-side label {
    display: block;
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.converter-side input {
    width: 100%;
    padding: 8px;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    background: var(--bg-color);
    color: var(--text-color);
    font-size: 20px;
    text-align: center;
}

.unit-list-container {
    background: var(--bg-color);
    border-radius: 8px;
    max-height: 300px;
    overflow-y: auto;
}

.unit-item {
    padding: 10px 14px;
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
    transition: background 0.15s;
}

.unit-item:hover {
    background: var(--button-bg);
}

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

/* Temperature */
.temperature-container {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    max-width: 600px;
    margin: 0 auto;
}

.temp-input-group {
    background: var(--card-bg);
    border-radius: 8px;
    padding: 16px;
    text-align: center;
}

.temp-input-group label {
    display: block;
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.temp-input-group input {
    width: 100%;
    padding: 10px;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    background: var(--bg-color);
    color: var(--text-color);
    font-size: 20px;
    text-align: center;
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        grid-template-columns: 1fr;
    }

    .sidebar {
        display: none;
    }

    .buttons-grid.scientific,
    .buttons-grid.programmer {
        grid-template-columns: repeat(4, 1fr);
    }

    .temperature-container {
        grid-template-columns: 1fr;
    }
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-color);
}

::-webkit-scrollbar-thumb {
    background: var(--button-bg);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--button-hover);
}

/* Memory Panel */
.memory-panel {
    background: var(--sidebar-bg);
    border-left: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transition: all 0.2s ease;
}

.memory-panel-hidden .memory-panel {
    display: none;
}

.memory-panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 15px 0;
}

.memory-panel-title {
    font-size: 18px;
    font-weight: bold;
    color: var(--text-color);
    margin: 0;
}

.memory-close-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 14px;
    cursor: pointer;
    width: 24px;
    height: 24px;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.15s;
}

.memory-close-btn:hover {
    background: #ff4444;
    color: #fff;
}

.memory-list {
    flex: 1;
    overflow-y: auto;
    padding: 10px;
}

.memory-item {
    display: flex;
    align-items: center;
    padding: 8px 10px;
    border-radius: 6px;
    margin-bottom: 4px;
    cursor: pointer;
    transition: background 0.15s;
}

.memory-item:hover {
    background: var(--button-bg);
}

.memory-item .memory-index {
    font-size: 11px;
    font-weight: bold;
    color: var(--accent-color);
    width: 30px;
}

.memory-item .memory-value {
    flex: 1;
    font-size: 14px;
    color: var(--text-color);
    text-align: right;
}

.memory-item .memory-delete {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 12px;
    cursor: pointer;
    width: 24px;
    height: 24px;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-left: 8px;
}

.memory-item .memory-delete:hover {
    background: #ff4444;
    color: #fff;
}

.memory-empty {
    text-align: center;
    color: var(--text-secondary);
    font-size: 12px;
    padding: 40px 10px;
    line-height: 1.6;
}

.memory-clear-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 13px;
    cursor: pointer;
    padding: 10px;
    margin: 5px 15px 15px;
    border-radius: 6px;
    transition: background 0.15s;
}

.memory-clear-btn:hover {
    background: var(--button-hover);
}

/* Memory Toggle Button (sidebar bottom, matching desktop app) */
.theme-selector {
    margin-top: auto;
}

.theme-selector + .separator {
    margin-top: 8px;
    margin-bottom: 4px;
}

.memory-toggle-btn-sidebar {
    background: var(--button-bg);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 14px;
    cursor: pointer;
    width: 160px;
    height: 32px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: all 0.15s;
    margin: 0 10px 10px 10px;
}

.memory-toggle-btn-sidebar:hover {
    background: var(--button-hover);
    color: var(--accent-color);
    border-color: var(--accent-color);
}

.memory-toggle-btn-sidebar svg {
    width: 18px;
    height: 18px;
}

.memory-panel-hidden .memory-toggle-btn-sidebar {
    display: none;
}

/* Content relative for toggle button positioning */
.content {
    position: relative;
}