@import url('https://fonts.googleapis.com/css2?family=Jua&display=swap');

:link {
    color: #6f6;
}

:visited {
    color: #66f;
}

/* ============================================
   CSS CUSTOM PROPERTIES - THEME SYSTEM
   ============================================ */
:root {
    --brand: #ccffcc;
    --brand-dark: #99dd99;
    --brand-darker: #66bb66;
    --brand-rgb: 204, 255, 204;

    /* Light theme base */
    --bg: #f4fdf4;
    --surface: rgba(255, 255, 255, 0.7);
    --surface-solid: #ffffff;
    --surface-hover: rgba(255, 255, 255, 0.9);
    --glass: rgba(204, 255, 204, 0.18);
    --glass-border: rgba(204, 255, 204, 0.45);
    --glass-shadow: rgba(0, 80, 0, 0.08);

    --text-primary: #1a2e1a;
    --text-secondary: #3a5a3a;
    --text-muted: #6a8a6a;
    --text-inverse: #ffffff;

    --border: rgba(0, 100, 0, 0.12);
    --border-focus: var(--brand-darker);

    --input-bg: rgba(255, 255, 255, 0.8);
    --input-border: rgba(0, 100, 0, 0.2);

    --sidebar-bg: rgba(240, 255, 240, 0.85);
    --header-bg: rgba(240, 255, 240, 0.9);

    --btn-primary-bg: var(--brand-dark);
    --btn-primary-text: #1a2e1a;
    --btn-secondary-bg: rgba(204, 255, 204, 0.3);
    --btn-secondary-border: rgba(0, 100, 0, 0.25);

    --calc-btn-bg: rgba(255, 255, 255, 0.75);
    --calc-btn-border: rgba(0, 100, 0, 0.18);
    --calc-btn-hover: rgba(204, 255, 204, 0.6);
    --calc-btn-operator: rgba(153, 221, 153, 0.5);
    --calc-btn-operator-hover: rgba(153, 221, 153, 0.8);
    --calc-btn-equals: var(--brand-dark);
    --calc-btn-equals-hover: var(--brand-darker);

    --display-bg: rgba(240, 255, 240, 0.9);
    --display-border: rgba(0, 100, 0, 0.2);

    --tag-bg: rgba(204, 255, 204, 0.4);
    --tag-text: #2a5a2a;

    --modal-overlay: rgba(0, 20, 0, 0.45);
    --modal-bg: rgba(255, 255, 255, 0.95);

    --toast-bg: rgba(240, 255, 240, 0.97);
    --toast-border: var(--brand-dark);

    --scrollbar-thumb: rgba(153, 221, 153, 0.5);
    --scrollbar-track: transparent;

    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-xl: 28px;

    --shadow-sm: 0 2px 8px var(--glass-shadow);
    --shadow-md: 0 4px 20px var(--glass-shadow);
    --shadow-lg: 0 8px 40px var(--glass-shadow);
    --glass-blur: blur(16px);
    --glass-blur-sm: blur(8px);

    --transition: 0.2s ease;
    --transition-slow: 0.35s ease;

    --sidebar-width: 280px;
    --header-height: 64px;
}

/* === NOT GREEN 1 (#ffcccc) === */
[data-theme="ng1"] {
    --brand: #ffcccc;
    --brand-dark: #dd9999;
    --brand-darker: #bb6666;
    --brand-rgb: 255, 204, 204;
    --bg: #fff4f4;
    --glass: rgba(255, 204, 204, 0.18);
    --glass-border: rgba(255, 204, 204, 0.45);
    --glass-shadow: rgba(80, 0, 0, 0.08);
    --sidebar-bg: rgba(255, 240, 240, 0.85);
    --header-bg: rgba(255, 240, 240, 0.9);
    --tag-bg: rgba(255, 204, 204, 0.4);
    --tag-text: #5a2a2a;
    --btn-primary-bg: var(--brand-dark);
    --btn-primary-text: #2e1a1a;
    --text-primary: #2e1a1a;
    --text-secondary: #5a3a3a;
    --text-muted: #8a6a6a;
    --border: rgba(100, 0, 0, 0.12);
    --input-border: rgba(100, 0, 0, 0.2);
    --calc-btn-hover: rgba(255, 204, 204, 0.6);
    --calc-btn-operator: rgba(221, 153, 153, 0.5);
    --calc-btn-operator-hover: rgba(221, 153, 153, 0.8);
    --calc-btn-equals: var(--brand-dark);
    --calc-btn-equals-hover: var(--brand-darker);
    --display-bg: rgba(255, 240, 240, 0.9);
    --display-border: rgba(100, 0, 0, 0.2);
    --toast-border: var(--brand-dark);
    --scrollbar-thumb: rgba(221, 153, 153, 0.5);
    --border-focus: var(--brand-darker);
    --btn-secondary-bg: rgba(255, 204, 204, 0.3);
    --btn-secondary-border: rgba(100, 0, 0, 0.25);
    --surface: rgba(255, 255, 255, 0.7);
    --surface-hover: rgba(255, 255, 255, 0.9);
    --modal-overlay: rgba(20, 0, 0, 0.45);
    --modal-bg: rgba(255, 255, 255, 0.95);
    --toast-bg: rgba(255, 244, 244, 0.97);
}

/* === NOT GREEN 2 (#ccccff) === */
[data-theme="ng2"] {
    --brand: #ccccff;
    --brand-dark: #9999dd;
    --brand-darker: #6666bb;
    --brand-rgb: 204, 204, 255;
    --bg: #f4f4ff;
    --glass: rgba(204, 204, 255, 0.18);
    --glass-border: rgba(204, 204, 255, 0.45);
    --glass-shadow: rgba(0, 0, 80, 0.08);
    --sidebar-bg: rgba(240, 240, 255, 0.85);
    --header-bg: rgba(240, 240, 255, 0.9);
    --tag-bg: rgba(204, 204, 255, 0.4);
    --tag-text: #2a2a5a;
    --btn-primary-bg: var(--brand-dark);
    --btn-primary-text: #1a1a2e;
    --text-primary: #1a1a2e;
    --text-secondary: #3a3a5a;
    --text-muted: #6a6a8a;
    --border: rgba(0, 0, 100, 0.12);
    --input-border: rgba(0, 0, 100, 0.2);
    --calc-btn-hover: rgba(204, 204, 255, 0.6);
    --calc-btn-operator: rgba(153, 153, 221, 0.5);
    --calc-btn-operator-hover: rgba(153, 153, 221, 0.8);
    --calc-btn-equals: var(--brand-dark);
    --calc-btn-equals-hover: var(--brand-darker);
    --display-bg: rgba(240, 240, 255, 0.9);
    --display-border: rgba(0, 0, 100, 0.2);
    --toast-border: var(--brand-dark);
    --scrollbar-thumb: rgba(153, 153, 221, 0.5);
    --border-focus: var(--brand-darker);
    --btn-secondary-bg: rgba(204, 204, 255, 0.3);
    --btn-secondary-border: rgba(0, 0, 100, 0.25);
    --surface: rgba(255, 255, 255, 0.7);
    --surface-hover: rgba(255, 255, 255, 0.9);
    --modal-overlay: rgba(0, 0, 20, 0.45);
    --modal-bg: rgba(255, 255, 255, 0.95);
    --toast-bg: rgba(244, 244, 255, 0.97);
}

/* === NOT GREEN 3 (#ffffcc) === */
[data-theme="ng3"] {
    --brand: #ffffcc;
    --brand-dark: #dddd99;
    --brand-darker: #bbbb66;
    --brand-rgb: 255, 255, 204;
    --bg: #fffff4;
    --glass: rgba(255, 255, 204, 0.18);
    --glass-border: rgba(255, 255, 204, 0.45);
    --glass-shadow: rgba(60, 60, 0, 0.08);
    --sidebar-bg: rgba(255, 255, 240, 0.85);
    --header-bg: rgba(255, 255, 240, 0.9);
    --tag-bg: rgba(255, 255, 204, 0.4);
    --tag-text: #5a5a2a;
    --btn-primary-bg: var(--brand-dark);
    --btn-primary-text: #2e2e1a;
    --text-primary: #2e2e1a;
    --text-secondary: #5a5a3a;
    --text-muted: #8a8a6a;
    --border: rgba(80, 80, 0, 0.12);
    --input-border: rgba(80, 80, 0, 0.2);
    --calc-btn-hover: rgba(255, 255, 204, 0.6);
    --calc-btn-operator: rgba(221, 221, 153, 0.5);
    --calc-btn-operator-hover: rgba(221, 221, 153, 0.8);
    --calc-btn-equals: var(--brand-dark);
    --calc-btn-equals-hover: var(--brand-darker);
    --display-bg: rgba(255, 255, 240, 0.9);
    --display-border: rgba(80, 80, 0, 0.2);
    --toast-border: var(--brand-dark);
    --scrollbar-thumb: rgba(221, 221, 153, 0.5);
    --border-focus: var(--brand-darker);
    --btn-secondary-bg: rgba(255, 255, 204, 0.3);
    --btn-secondary-border: rgba(80, 80, 0, 0.25);
    --surface: rgba(255, 255, 255, 0.7);
    --surface-hover: rgba(255, 255, 255, 0.9);
    --modal-overlay: rgba(20, 20, 0, 0.45);
    --modal-bg: rgba(255, 255, 255, 0.95);
    --toast-bg: rgba(255, 255, 244, 0.97);
}

/* === NOT GREEN 4 (#ffccff) === */
[data-theme="ng4"] {
    --brand: #ffccff;
    --brand-dark: #dd99dd;
    --brand-darker: #bb66bb;
    --brand-rgb: 255, 204, 255;
    --bg: #fff4ff;
    --glass: rgba(255, 204, 255, 0.18);
    --glass-border: rgba(255, 204, 255, 0.45);
    --glass-shadow: rgba(80, 0, 80, 0.08);
    --sidebar-bg: rgba(255, 240, 255, 0.85);
    --header-bg: rgba(255, 240, 255, 0.9);
    --tag-bg: rgba(255, 204, 255, 0.4);
    --tag-text: #5a2a5a;
    --btn-primary-bg: var(--brand-dark);
    --btn-primary-text: #2e1a2e;
    --text-primary: #2e1a2e;
    --text-secondary: #5a3a5a;
    --text-muted: #8a6a8a;
    --border: rgba(100, 0, 100, 0.12);
    --input-border: rgba(100, 0, 100, 0.2);
    --calc-btn-hover: rgba(255, 204, 255, 0.6);
    --calc-btn-operator: rgba(221, 153, 221, 0.5);
    --calc-btn-operator-hover: rgba(221, 153, 221, 0.8);
    --calc-btn-equals: var(--brand-dark);
    --calc-btn-equals-hover: var(--brand-darker);
    --display-bg: rgba(255, 240, 255, 0.9);
    --display-border: rgba(100, 0, 100, 0.2);
    --toast-border: var(--brand-dark);
    --scrollbar-thumb: rgba(221, 153, 221, 0.5);
    --border-focus: var(--brand-darker);
    --btn-secondary-bg: rgba(255, 204, 255, 0.3);
    --btn-secondary-border: rgba(100, 0, 100, 0.25);
    --surface: rgba(255, 255, 255, 0.7);
    --surface-hover: rgba(255, 255, 255, 0.9);
    --modal-overlay: rgba(20, 0, 20, 0.45);
    --modal-bg: rgba(255, 255, 255, 0.95);
    --toast-bg: rgba(255, 244, 255, 0.97);
}

/* === NOT GREEN 5 (#ccffff) === */
[data-theme="ng5"] {
    --brand: #ccffff;
    --brand-dark: #99dddd;
    --brand-darker: #66bbbb;
    --brand-rgb: 204, 255, 255;
    --bg: #f4ffff;
    --glass: rgba(204, 255, 255, 0.18);
    --glass-border: rgba(204, 255, 255, 0.45);
    --glass-shadow: rgba(0, 60, 60, 0.08);
    --sidebar-bg: rgba(240, 255, 255, 0.85);
    --header-bg: rgba(240, 255, 255, 0.9);
    --tag-bg: rgba(204, 255, 255, 0.4);
    --tag-text: #2a5a5a;
    --btn-primary-bg: var(--brand-dark);
    --btn-primary-text: #1a2e2e;
    --text-primary: #1a2e2e;
    --text-secondary: #3a5a5a;
    --text-muted: #6a8a8a;
    --border: rgba(0, 80, 80, 0.12);
    --input-border: rgba(0, 80, 80, 0.2);
    --calc-btn-hover: rgba(204, 255, 255, 0.6);
    --calc-btn-operator: rgba(153, 221, 221, 0.5);
    --calc-btn-operator-hover: rgba(153, 221, 221, 0.8);
    --calc-btn-equals: var(--brand-dark);
    --calc-btn-equals-hover: var(--brand-darker);
    --display-bg: rgba(240, 255, 255, 0.9);
    --display-border: rgba(0, 80, 80, 0.2);
    --toast-border: var(--brand-dark);
    --scrollbar-thumb: rgba(153, 221, 221, 0.5);
    --border-focus: var(--brand-darker);
    --btn-secondary-bg: rgba(204, 255, 255, 0.3);
    --btn-secondary-border: rgba(0, 80, 80, 0.25);
    --surface: rgba(255, 255, 255, 0.7);
    --surface-hover: rgba(255, 255, 255, 0.9);
    --modal-overlay: rgba(0, 20, 20, 0.45);
    --modal-bg: rgba(255, 255, 255, 0.95);
    --toast-bg: rgba(244, 255, 255, 0.97);
}

/* === REALLY REALLY LIGHT GREEN (#ffffff) === */
[data-theme="white"] {
    --brand: #ffffff;
    --brand-dark: #e0e0e0;
    --brand-darker: #c0c0c0;
    --brand-rgb: 255, 255, 255;
    --bg: #fafafa;
    --glass: rgba(255, 255, 255, 0.3);
    --glass-border: rgba(200, 200, 200, 0.5);
    --glass-shadow: rgba(0, 0, 0, 0.06);
    --sidebar-bg: rgba(248, 248, 248, 0.9);
    --header-bg: rgba(248, 248, 248, 0.95);
    --tag-bg: rgba(240, 240, 240, 0.6);
    --tag-text: #444444;
    --btn-primary-bg: #dddddd;
    --btn-primary-text: #222222;
    --text-primary: #222222;
    --text-secondary: #555555;
    --text-muted: #888888;
    --border: rgba(0, 0, 0, 0.1);
    --input-border: rgba(0, 0, 0, 0.15);
    --calc-btn-hover: rgba(240, 240, 240, 0.9);
    --calc-btn-operator: rgba(220, 220, 220, 0.7);
    --calc-btn-operator-hover: rgba(200, 200, 200, 0.9);
    --calc-btn-equals: #cccccc;
    --calc-btn-equals-hover: #b0b0b0;
    --display-bg: rgba(245, 245, 245, 0.95);
    --display-border: rgba(0, 0, 0, 0.15);
    --toast-border: #cccccc;
    --scrollbar-thumb: rgba(180, 180, 180, 0.6);
    --border-focus: #999999;
    --btn-secondary-bg: rgba(240, 240, 240, 0.5);
    --btn-secondary-border: rgba(0, 0, 0, 0.15);
    --surface: rgba(255, 255, 255, 0.8);
    --surface-hover: rgba(255, 255, 255, 0.95);
    --modal-overlay: rgba(0, 0, 0, 0.3);
    --modal-bg: rgba(255, 255, 255, 0.98);
    --toast-bg: rgba(250, 250, 250, 0.99);
}

/* ============================================
   RESET & BASE
   ============================================ */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: 'Jua', sans-serif;
    background-color: var(--bg);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    transition: background-color var(--transition-slow), color var(--transition-slow);
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--scrollbar-thumb);
    border-radius: 3px;
}

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

a {
    color: inherit;
    text-decoration: none;
}

button {
    font-family: 'Jua', sans-serif;
    cursor: pointer;
    border: none;
    outline: none;
}

input,
select,
textarea {
    font-family: 'Jua', sans-serif;
}

svg {
    flex-shrink: 0;
}

/* Focus visible */
:focus-visible {
    outline: 2px solid var(--brand-darker);
    outline-offset: 2px;
}

/* ============================================
   GLASS UTILITY
   ============================================ */
.glass {
    background: var(--glass);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.glass-sm {
    background: var(--glass);
    backdrop-filter: var(--glass-blur-sm);
    -webkit-backdrop-filter: var(--glass-blur-sm);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

/* ============================================
   LAYOUT
   ============================================ */
.app-layout {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.main-container {
    display: flex;
    flex: 1;
    padding-top: var(--header-height);
}

/* ============================================
   HEADER
   ============================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    z-index: 100;
    background: var(--header-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid var(--glass-border);
    box-shadow: var(--shadow-sm);
    display: flex;
    align-items: center;
    padding: 0 20px;
    gap: 16px;
    transition: background var(--transition-slow);
}

.header-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.4rem;
    font-weight: 400;
    color: var(--text-primary);
    white-space: nowrap;
    text-decoration: none;
}

.header-logo svg {
    width: 32px;
    height: 32px;
}

.header-search {
    flex: 1;
    max-width: 520px;
    margin: 0 auto;
    position: relative;
}

.header-search input {
    width: 100%;
    padding: 10px 16px 10px 44px;
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: var(--radius-xl);
    font-size: 0.95rem;
    color: var(--text-primary);
    transition: border-color var(--transition), box-shadow var(--transition);
}

.header-search input:focus {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(var(--brand-rgb), 0.35);
    outline: none;
}

.header-search input::placeholder {
    color: var(--text-muted);
}

.header-search-icon {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    pointer-events: none;
}

.search-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    right: 0;
    background: var(--modal-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    max-height: 400px;
    overflow-y: auto;
    z-index: 200;
    display: none;
}

.search-dropdown.active {
    display: block;
}

.search-result-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    cursor: pointer;
    transition: background var(--transition);
    border-bottom: 1px solid var(--border);
}

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

.search-result-item:hover {
    background: var(--glass);
}

.search-result-item .result-name {
    font-size: 0.95rem;
    color: var(--text-primary);
}

.search-result-item .result-cat {
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-top: 1px;
}

.search-no-results {
    padding: 20px;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-left: auto;
}

.icon-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    background: var(--btn-secondary-bg);
    border: 1px solid var(--btn-secondary-border);
    color: var(--text-primary);
    transition: background var(--transition), transform var(--transition);
    font-size: 0;
}

.icon-btn:hover {
    background: var(--glass);
    transform: scale(1.05);
}

.coffee-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 14px;
    border-radius: var(--radius-md);
    background: var(--btn-secondary-bg);
    border: 1px solid var(--btn-secondary-border);
    color: var(--text-primary);
    font-size: 0.85rem;
    transition: background var(--transition), transform var(--transition);
    white-space: nowrap;
    text-decoration: none;
}

.coffee-btn:hover {
    background: var(--glass);
    transform: scale(1.03);
}

.hamburger-btn {
    display: none;
}

/* ============================================
   SIDEBAR
   ============================================ */
.sidebar {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: var(--sidebar-width);
    height: calc(100vh - var(--header-height));
    background: var(--sidebar-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-right: 1px solid var(--glass-border);
    overflow-y: auto;
    z-index: 50;
    transition: transform var(--transition-slow), background var(--transition-slow);
    padding: 16px 0;
}

.sidebar-section {
    margin-bottom: 4px;
}

.sidebar-section-header {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 20px;
    font-size: 0.78rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    cursor: pointer;
    transition: color var(--transition);
    user-select: none;
}

.sidebar-section-header:hover {
    color: var(--text-secondary);
}

.sidebar-section-header .section-chevron {
    margin-left: auto;
    transition: transform var(--transition);
}

.sidebar-section.collapsed .section-chevron {
    transform: rotate(-90deg);
}

.sidebar-section.collapsed .sidebar-section-items {
    display: none;
}

.sidebar-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 9px 20px 9px 32px;
    font-size: 0.88rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: background var(--transition), color var(--transition);
    border-left: 3px solid transparent;
    text-decoration: none;
}

.sidebar-item:hover {
    background: var(--glass);
    color: var(--text-primary);
}

.sidebar-item.active {
    background: rgba(var(--brand-rgb), 0.25);
    color: var(--text-primary);
    border-left-color: var(--brand-darker);
    font-weight: 700;
}

.sidebar-fav-star {
    margin-left: auto;
    opacity: 0;
    transition: opacity var(--transition);
    cursor: pointer;
    color: var(--brand-darker);
}

.sidebar-item:hover .sidebar-fav-star {
    opacity: 1;
}

.sidebar-fav-star.starred {
    opacity: 1;
    color: #f59e0b;
}

/* ============================================
   MAIN CONTENT
   ============================================ */
.main-content {
    margin-left: var(--sidebar-width);
    flex: 1;
    padding: 28px 32px;
    min-width: 0;
    transition: margin var(--transition-slow);
}

/* ============================================
   HOME PAGE - HERO CALCULATOR
   ============================================ */
.home-grid {
    display: grid;
    grid-template-columns: 380px 1fr;
    gap: 28px;
    align-items: start;
}

.calc-widget {
    position: sticky;
    top: calc(var(--header-height) + 20px);
    background: var(--surface);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

.calc-mode-tabs {
    display: flex;
    background: var(--glass);
    border-bottom: 1px solid var(--glass-border);
}

.calc-mode-tab {
    flex: 1;
    padding: 12px;
    font-size: 0.9rem;
    color: var(--text-muted);
    background: transparent;
    border: none;
    border-bottom: 2px solid transparent;
    transition: color var(--transition), border-color var(--transition), background var(--transition);
    cursor: pointer;
}

.calc-mode-tab.active {
    color: var(--text-primary);
    border-bottom-color: var(--brand-darker);
    background: rgba(var(--brand-rgb), 0.15);
}

.calc-display {
    background: var(--display-bg);
    border-bottom: 1px solid var(--display-border);
    padding: 16px 20px;
    text-align: right;
    min-height: 90px;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
}

.calc-expression {
    font-size: 0.85rem;
    color: var(--text-muted);
    min-height: 22px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    direction: rtl;
    unicode-bidi: plaintext;
}

.calc-result {
    font-size: 2.4rem;
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    direction: rtl;
    unicode-bidi: plaintext;
    line-height: 1.1;
}

.calc-btns {
    padding: 12px;
    display: grid;
    gap: 8px;
}

.calc-btns.basic-grid {
    grid-template-columns: repeat(4, 1fr);
}

.calc-btns.sci-grid {
    grid-template-columns: repeat(5, 1fr);
}

.cbtn {
    padding: 14px 8px;
    font-size: 1rem;
    border-radius: var(--radius-sm);
    background: var(--calc-btn-bg);
    border: 1px solid var(--calc-btn-border);
    color: var(--text-primary);
    transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    backdrop-filter: var(--glass-blur-sm);
    -webkit-backdrop-filter: var(--glass-blur-sm);
}

.cbtn:hover {
    background: var(--calc-btn-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.cbtn:active {
    transform: translateY(0);
    box-shadow: none;
}

.cbtn.op {
    background: var(--calc-btn-operator);
}

.cbtn.op:hover {
    background: var(--calc-btn-operator-hover);
}

.cbtn.eq {
    background: var(--calc-btn-equals);
    color: var(--btn-primary-text);
    font-size: 1.2rem;
}

.cbtn.eq:hover {
    background: var(--calc-btn-equals-hover);
}

.cbtn.span2 {
    grid-column: span 2;
}

.cbtn.fn {
    font-size: 0.78rem;
}

/* ============================================
   HOME PAGE - DISCOVER SECTION
   ============================================ */
.discover-section {
    min-width: 0;
}

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

.section-title {
    font-size: 1.25rem;
    color: var(--text-primary);
}

.section-badge {
    padding: 4px 10px;
    background: var(--tag-bg);
    color: var(--tag-text);
    border-radius: 20px;
    font-size: 0.78rem;
}

.category-tabs {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 20px;
}

.cat-tab {
    padding: 8px 16px;
    border-radius: var(--radius-xl);
    background: var(--btn-secondary-bg);
    border: 1px solid var(--btn-secondary-border);
    font-size: 0.85rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition);
}

.cat-tab.active,
.cat-tab:hover {
    background: var(--brand);
    color: var(--text-primary);
    border-color: var(--brand-dark);
}

.calc-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 14px;
}

.calc-card {
    background: var(--surface);
    backdrop-filter: var(--glass-blur-sm);
    -webkit-backdrop-filter: var(--glass-blur-sm);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 18px 16px;
    cursor: pointer;
    transition: all var(--transition);
    display: flex;
    flex-direction: column;
    gap: 8px;
    text-decoration: none;
    position: relative;
    overflow: hidden;
}

.calc-card:hover {
    background: var(--surface-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--brand-dark);
}

.calc-card-icon {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--glass);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
}

.calc-card-name {
    font-size: 0.9rem;
    color: var(--text-primary);
    line-height: 1.3;
}

.calc-card-cat {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.calc-card-fav {
    position: absolute;
    top: 10px;
    right: 10px;
    opacity: 0;
    transition: opacity var(--transition);
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 4px;
}

.calc-card-fav svg {
    fill: none;
    stroke: currentColor;
    stroke-width: 2;
}

.calc-card:hover .calc-card-fav {
    opacity: 1;
}

.calc-card-fav.starred {
    opacity: 1;
    color: #f59e0b;
}

.calc-card-fav.starred svg {
    fill: currentColor;
    stroke: none;
}

/* ============================================
   CALCULATOR PAGE
   ============================================ */
.calc-page {
    max-width: 900px;
}

.calc-page-header {
    margin-bottom: 28px;
}

.breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 12px;
}

.breadcrumb a {
    color: var(--brand-darker);
}

.breadcrumb a:hover {
    text-decoration: underline;
}

.breadcrumb svg {
    width: 14px;
    height: 14px;
}

.calc-page-title {
    font-size: 1.8rem;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.calc-page-desc {
    font-size: 0.92rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.calc-page-actions {
    display: flex;
    gap: 10px;
    margin-top: 16px;
    flex-wrap: wrap;
}

.fav-btn,
.history-btn-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 9px 16px;
    border-radius: var(--radius-md);
    background: var(--btn-secondary-bg);
    border: 1px solid var(--btn-secondary-border);
    font-size: 0.85rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition);
}

.fav-btn:hover,
.history-btn-header:hover {
    background: var(--glass);
    color: var(--text-primary);
}

.fav-btn.active {
    color: #f59e0b;
    border-color: #f59e0b;
    background: rgba(245, 158, 11, 0.1);
}

.calc-engine-container {
    background: var(--surface);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    padding: 28px;
    margin-bottom: 24px;
}

/* Form elements */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.form-input,
.form-select {
    width: 100%;
    padding: 11px 15px;
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    color: var(--text-primary);
    transition: border-color var(--transition), box-shadow var(--transition);
    appearance: none;
}

.form-input:focus,
.form-select:focus {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(var(--brand-rgb), 0.35);
    outline: none;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.form-row-3 {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 16px;
}

.input-group {
    position: relative;
    display: flex;
    align-items: center;
}

.input-prefix,
.input-suffix {
    position: absolute;
    color: var(--text-muted);
    font-size: 0.9rem;
    pointer-events: none;
}

.input-prefix {
    left: 12px;
}

.input-suffix {
    right: 12px;
}

.input-prefix~.form-input {
    padding-left: 26px;
}

.input-suffix~.form-input,
.form-input:has(~ .input-suffix) {
    padding-right: 36px;
}

.input-group .form-input {
    flex: 1;
}

.btn-primary {
    padding: 12px 28px;
    background: var(--btn-primary-bg);
    color: var(--btn-primary-text);
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    cursor: pointer;
    transition: all var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-primary:hover {
    opacity: 0.9;
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.btn-secondary {
    padding: 12px 24px;
    background: var(--btn-secondary-bg);
    color: var(--text-secondary);
    border: 1px solid var(--btn-secondary-border);
    border-radius: var(--radius-md);
    font-size: 1rem;
    cursor: pointer;
    transition: all var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-secondary:hover {
    background: var(--glass);
    color: var(--text-primary);
}

.result-card {
    background: rgba(var(--brand-rgb), 0.12);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 20px 24px;
    margin-top: 20px;
}

.result-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 0;
    border-bottom: 1px solid var(--border);
}

.result-row:last-child {
    border-bottom: none;
}

.result-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.result-value {
    font-size: 1rem;
    color: var(--text-primary);
    font-weight: 700;
}

.result-primary .result-value {
    font-size: 1.35rem;
    color: var(--brand-darker);
}

/* ============================================
   CALCULATOR ENGINE FIELDS & BUTTONS
   ============================================ */
.calc-field {
    margin-bottom: 16px;
}

.calc-field label {
    display: block;
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.calc-field input,
.calc-field select {
    width: 100%;
    padding: 11px 15px;
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    font-family: 'Jua', sans-serif;
    color: var(--text-primary);
    transition: border-color var(--transition), box-shadow var(--transition);
    appearance: none;
    -webkit-appearance: none;
}

.calc-field input:focus,
.calc-field select:focus {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(var(--brand-rgb), 0.35);
    outline: none;
}

.calc-field input::placeholder {
    color: var(--text-muted);
}

.calc-field select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%236a8a6a' stroke-width='2.5'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 36px;
    cursor: pointer;
}

.calc-actions {
    display: flex;
    gap: 10px;
    margin-top: 20px;
    margin-bottom: 20px;
}

.btn-calc {
    padding: 12px 28px;
    background: var(--btn-primary-bg);
    color: var(--btn-primary-text);
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-family: 'Jua', sans-serif;
    cursor: pointer;
    transition: all var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-calc:hover {
    opacity: 0.9;
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

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

.btn-reset {
    padding: 12px 24px;
    background: var(--btn-secondary-bg);
    color: var(--text-secondary);
    border: 1px solid var(--btn-secondary-border);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-family: 'Jua', sans-serif;
    cursor: pointer;
    transition: all var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-reset:hover {
    background: var(--glass);
    color: var(--text-primary);
}

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

.calc-result {
    background: rgba(var(--brand-rgb), 0.12);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 20px 24px;
    margin-top: 20px;
}

.calc-error {
    background: rgba(229, 62, 62, 0.08);
    border: 1px solid rgba(229, 62, 62, 0.3);
    border-radius: var(--radius-md);
    padding: 14px 18px;
    margin-top: 16px;
    color: #c53030;
    font-size: 0.9rem;
}

/* ============================================
   HISTORY PANEL
   ============================================ */
.history-panel {
    background: var(--surface);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    padding: 20px;
    margin-bottom: 20px;
    display: none;
}

.history-panel.open {
    display: block;
}

.history-panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
}

.history-panel-title {
    font-size: 1rem;
    color: var(--text-primary);
}

.history-clear-btn {
    font-size: 0.8rem;
    color: var(--text-muted);
    background: none;
    border: none;
    cursor: pointer;
    transition: color var(--transition);
}

.history-clear-btn:hover {
    color: #e53e3e;
}

.history-item {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    padding: 10px 0;
    border-bottom: 1px solid var(--border);
    font-size: 0.85rem;
    gap: 12px;
}

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

.history-item-inputs {
    color: var(--text-secondary);
    line-height: 1.5;
    flex: 1;
}

.history-item-result {
    color: var(--text-primary);
    font-weight: 700;
    text-align: right;
}

.history-item-time {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.history-empty {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.88rem;
    padding: 20px 0;
}

/* ============================================
   MODAL - THEME PICKER
   ============================================ */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: var(--modal-overlay);
    z-index: 300;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-slow);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}

.modal-overlay.open {
    opacity: 1;
    pointer-events: all;
}

.modal {
    background: var(--modal-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    padding: 28px;
    width: min(480px, calc(100vw - 32px));
    transform: scale(0.95);
    transition: transform var(--transition-slow);
}

.modal-overlay.open .modal {
    transform: scale(1);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
}

.modal-title {
    font-size: 1.15rem;
    color: var(--text-primary);
}

.modal-close {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
    background: var(--btn-secondary-bg);
    border: 1px solid var(--btn-secondary-border);
    color: var(--text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition);
}

.modal-close:hover {
    background: var(--glass);
    color: var(--text-primary);
}

.theme-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.theme-option {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 14px;
    border-radius: var(--radius-md);
    border: 2px solid var(--border);
    cursor: pointer;
    transition: all var(--transition);
    background: var(--surface);
}

.theme-option:hover {
    border-color: var(--brand-dark);
    background: var(--surface-hover);
}

.theme-option.selected {
    border-color: var(--brand-darker);
    background: rgba(var(--brand-rgb), 0.15);
}

.theme-swatch {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    border: 2px solid var(--border);
    flex-shrink: 0;
}

.theme-name {
    font-size: 0.88rem;
    color: var(--text-primary);
}

/* ============================================
   TOAST NOTIFICATIONS
   ============================================ */
.toast-container {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 400;
    display: flex;
    flex-direction: column;
    gap: 10px;
    pointer-events: none;
}

.toast {
    background: var(--toast-bg);
    border: 1px solid var(--toast-border);
    border-radius: var(--radius-md);
    padding: 12px 20px;
    font-size: 0.9rem;
    color: var(--text-primary);
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    gap: 10px;
    pointer-events: all;
    animation: slideInToast 0.25s ease forwards;
    backdrop-filter: var(--glass-blur-sm);
    -webkit-backdrop-filter: var(--glass-blur-sm);
}

.toast.removing {
    animation: slideOutToast 0.25s ease forwards;
}

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

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

@keyframes slideOutToast {
    from {
        opacity: 1;
        transform: translateX(0);
    }

    to {
        opacity: 0;
        transform: translateX(20px);
    }
}

/* ============================================
   SIDEBAR OVERLAY (MOBILE)
   ============================================ */
.sidebar-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    z-index: 49;
    display: none;
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 1024px) {
    .home-grid {
        grid-template-columns: 1fr;
    }

    .calc-widget {
        position: static;
        max-width: 420px;
    }
}

@media (max-width: 768px) {
    :root {
        --sidebar-width: 280px;
    }

    .sidebar {
        transform: translateX(-100%);
        z-index: 60;
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .sidebar-overlay.active {
        display: block;
    }

    .main-content {
        margin-left: 0;
        padding: 20px 16px;
    }

    .hamburger-btn {
        display: flex;
        align-items: center;
        justify-content: center;
        width: 40px;
        height: 40px;
        border-radius: var(--radius-md);
        background: var(--btn-secondary-bg);
        border: 1px solid var(--btn-secondary-border);
        color: var(--text-primary);
        cursor: pointer;
        transition: background var(--transition);
        flex-shrink: 0;
    }

    .header-logo span {
        display: none;
    }

    .coffee-btn span {
        display: none;
    }

    .coffee-btn {
        width: 40px;
        height: 40px;
        padding: 0;
        justify-content: center;
    }

    .form-row,
    .form-row-3 {
        grid-template-columns: 1fr;
    }

    .calc-btns.sci-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

@media (max-width: 480px) {
    .header {
        padding: 0 12px;
        gap: 8px;
    }

    .header-search {
        max-width: 100%;
    }

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

    .calc-grid {
        grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    }

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