:root {
    /* DEFAULT: LIGHT MODE */
    --bg-color-main: #F8FAFC;
    --bg-color-secondary: #FFFFFF;
    --text-primary: #0F172A;
    --text-secondary: #475569;
    --accent-color: #0284C7;
    --accent-hover: #0369A1;
    --border-color: rgba(0, 0, 0, 0.08);
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(0, 0, 0, 0.05);

    --h1-gradient-start: #0F172A;
    --h1-gradient-end: #334155;

    --transition-speed: 0.3s;
    --border-radius: 12px;
}

html.dark {
    /* DARK MODE */
    --bg-color-main: #0B0E14;
    --bg-color-secondary: #151A22;
    --text-primary: #E2E8F0;
    --text-secondary: #94A3B8;
    --accent-color: #38BDF8;
    --accent-hover: #0284C7;
    --border-color: rgba(255, 255, 255, 0.08);
    --glass-bg: rgba(21, 26, 34, 0.6);
    --glass-border: rgba(255, 255, 255, 0.05);

    --h1-gradient-start: #E2E8F0;
    --h1-gradient-end: #94A3B8;
}

.theme-toggle {
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 50%;
    color: var(--text-secondary);
    font-size: 1.1rem;
    cursor: pointer;
    width: 36px;
    height: 36px;
    min-width: 36px;
    min-height: 36px;
    padding: 0;
    transition: color var(--transition-speed), border-color var(--transition-speed), background-color var(--transition-speed);
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-toggle:hover {
    color: var(--accent-color);
    border-color: var(--accent-color);
    background-color: rgba(255, 255, 255, 0.03);
}

html.light .theme-toggle:hover {
    background-color: rgba(0, 0, 0, 0.03);
}

.theme-toggle .light-icon {
    display: none;
}

.theme-toggle .dark-icon {
    display: block;
}

html.dark .theme-toggle .light-icon {
    display: block;
}

html.dark .theme-toggle .dark-icon {
    display: none;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color-main);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Typography & Layout */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.text-center {
    text-align: center;
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    background: linear-gradient(90deg, var(--h1-gradient-start) 0%, var(--h1-gradient-end) 100%);
    background-clip: text;
    /* Standard property for compatibility */
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Navbar */
.navbar {
    background-color: var(--bg-color-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 1rem;
    width: auto;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo i {
    color: var(--accent-color);
}

.nav-right-area {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.nav-links {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    padding: 0.5rem 1.2rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    transition: all var(--transition-speed);
    background-color: transparent;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--text-primary);
    border-color: var(--accent-color);
    background-color: rgba(56, 189, 248, 0.1);
}

/* Header Sections */
.page-header {
    text-align: center;
    margin: 3rem 0 2rem 0;
    /* Reduced bottom margin to accommodate ads smoothly */
}

/* Subtly Glass Panels */
.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin-bottom: 2rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

/* Category Tabs */
.category-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    padding: 0.35rem;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.category-tab {
    flex: 1;
    padding: 0.7rem 1.2rem;
    border: 1px solid transparent;
    border-radius: 8px;
    background: transparent;
    color: var(--text-secondary);
    font-family: 'Inter', sans-serif;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-speed);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.category-tab:hover {
    color: var(--text-primary);
    background-color: rgba(255, 255, 255, 0.04);
}

.category-tab.active {
    color: var(--text-primary);
    background-color: rgba(56, 189, 248, 0.12);
    border-color: var(--accent-color);
    box-shadow: 0 0 12px rgba(56, 189, 248, 0.15);
}

.category-tab i {
    font-size: 0.85rem;
}

/* Controls & Filters (Index) */
.controls-section {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 1rem;
    align-items: center;
}

.search-box {
    position: relative;
    flex: 1;
    min-width: 300px;
}

.search-box i {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
}

.search-box input {
    width: 100%;
    padding: 0.8rem 1rem 0.8rem 2.8rem;
    background-color: var(--bg-color-main);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-family: 'Inter', sans-serif;
    outline: none;
    transition: border-color var(--transition-speed);
}

.search-box input:focus {
    border-color: var(--accent-color);
}

.filters {
    display: flex;
    gap: 1rem;
}

select,
input[type="number"] {
    padding: 0.8rem 1rem;
    background-color: var(--bg-color-main);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-family: 'Inter', sans-serif;
    outline: none;
    cursor: pointer;
    transition: border-color var(--transition-speed);
    appearance: none;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    background-size: 1em;
    padding-right: 2.5rem;
}

select:focus,
input[type="number"]:focus {
    border-color: var(--accent-color);
}

input[type="number"] {
    background-image: none;
    padding-right: 1rem;
    cursor: text;
}

/* Custom styled number input spin buttons */
input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button {
    -webkit-appearance: inner-spin-button;
    background-color: transparent;
    cursor: pointer;
    opacity: 0.5;
    transition: opacity var(--transition-speed);
}

input[type="number"]::-webkit-inner-spin-button:hover {
    opacity: 1;
}

input[type="number"] {
    -moz-appearance: number-input;
    appearance: auto;
}

/* Table Styles (Index) */
.table-container {
    width: 100%;
    padding: 0;
}

table {
    width: 100%;
    min-width: 100%;
    /* Let browser decide width on PC to prevent unnecessary scrolling */
    border-collapse: collapse;
    text-align: left;
}

th,
td {
    padding: 1rem 0.5rem;
    border-bottom: 1px solid var(--border-color);
    border-right: 1px solid rgba(128, 128, 128, 0.08);
}

th:last-child,
td:last-child {
    border-right: none;
}

th:first-child,
td:first-child {
    padding-left: 1.5rem;
}

th:last-child,
td:last-child {
    padding-right: 1.5rem;
}

th:nth-child(4),
td:nth-child(4) {
    width: 130px;
    /* Limit input col width */
}

th:nth-child(5),
td:nth-child(5) {
    width: 130px;
    /* Limit output col width */
}

th {
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    cursor: pointer;
    transition: color var(--transition-speed);
}

th:hover {
    color: var(--text-primary);
}

td {
    font-size: 0.95rem;
    vertical-align: middle;
}

tr:last-child td {
    border-bottom: none;
}

tr:hover td {
    background-color: rgba(255, 255, 255, 0.02);
}

/* Show More Button (Table Footer Variant) */
.show-more-wrapper {
    width: 100%;
    border-top: 1px solid var(--border-color);
    background-color: var(--bg-color-secondary);
    border-bottom-left-radius: var(--border-radius);
    border-bottom-right-radius: var(--border-radius);
    display: none;
    /* Controlled by app.js */
}

.btn-show-more {
    width: 100%;
    background: transparent;
    border: none;
    padding: 1rem;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-primary);
    cursor: pointer;
    transition: background-color var(--transition-speed), color var(--transition-speed);
    display: flex;
    justify-content: center;
    align-items: center;
    border-bottom-left-radius: var(--border-radius);
    border-bottom-right-radius: var(--border-radius);
}

.btn-show-more:hover {
    background-color: rgba(255, 255, 255, 0.03);
    color: var(--accent-color);
}

html.light .btn-show-more:hover {
    background-color: rgba(0, 0, 0, 0.03);
}

.tag {
    display: inline-block;
    padding: 0.25rem 0.6rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.tag.text {
    background-color: rgba(56, 189, 248, 0.1);
    color: var(--accent-color);
}

.tag.image {
    background-color: rgba(167, 139, 250, 0.1);
    color: #A78BFA;
}

.price-standard {
    color: #7dd3fc;
    /* Soft cyan/blue matching the UI accent */
}

.company-logo {
    width: 24px;
    height: 24px;
    border-radius: 4px;
    margin-right: 0.5rem;
    vertical-align: middle;
}

/* Calculator Panel */
.calculator-panel {
    max-width: 800px;
    margin: 0 auto 3rem auto;
}

.form-group {
    margin-bottom: 1.5rem;
    display: flex;
    flex-direction: column;
}

.form-group label {
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.form-group label small {
    display: block;
    color: var(--text-secondary);
    font-size: 0.8rem;
    font-weight: 400;
    margin-top: 0.2rem;
}

.form-row {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
    align-items: flex-end;
}

.half {
    flex: 1;
    min-width: 250px;
}

.col-40 {
    flex: 0 0 38%;
    min-width: 200px;
}

.col-60 {
    flex: 1;
    min-width: 250px;
}

.select-wrapper select,
.form-group input {
    width: 100%;
}

.hinttext {
    display: block;
    margin-top: 0.4rem;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

/* Result Box */
.result-box {
    margin-top: 2.5rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.result-title {
    color: var(--text-secondary);
    text-transform: uppercase;
    font-size: 0.9rem;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
}

.price-display {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 0.2rem;
    margin-bottom: 1.5rem;
}

.price-display .currency {
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.price-display .amount {
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--accent-color);
}

.cost-breakdown {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.breakdown-item {
    display: flex;
    flex-direction: column;
    background-color: rgba(255, 255, 255, 0.03);
    padding: 1rem;
    border-radius: 8px;
    min-width: 150px;
}

.breakdown-item span:first-child {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0.3rem;
}

.breakdown-item span:last-child {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* Footer */
footer {
    margin-top: auto;
    padding: 2rem 0;
    border-top: 1px solid var(--border-color);
    background-color: var(--bg-color-secondary);
}

footer p {
    font-size: 0.85rem;
    margin-bottom: 0.5rem;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.6rem 1.2rem;
    border-radius: 6px;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-speed);
    border: none;
    font-family: inherit;
    font-size: 0.9rem;
}

.btn-primary {
    background-color: var(--accent-color);
    color: var(--bg-color-main);
}

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

.btn-outline {
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.btn-outline:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
}

/* Utility / Responsive */
@media (max-width: 768px) {
    h1 {
        font-size: 2rem;
    }

    .navbar {
        padding: 0.75rem 0.5rem;
        position: static;
    }

    .nav-content {
        flex-direction: column;
        align-items: center;
        gap: 0.5rem;
    }

    .logo-area {
        width: auto;
        justify-content: center;
    }

    .logo {
        font-size: 1.3rem;
    }

    .nav-right-area {
        display: flex;
        flex-direction: row;
        align-items: center;
        justify-content: center;
        gap: 0.5rem;
        width: 100%;
    }

    .nav-links {
        display: flex;
        flex-wrap: nowrap;
        gap: 0.4rem;
    }

    .nav-links a {
        margin: 0;
        padding: 0.4rem 0.8rem;
        font-size: 0.8rem;
        white-space: nowrap;
    }

    .theme-toggle {
        margin-left: 0;
        flex-shrink: 0;
    }

    .controls-section {
        flex-direction: column;
        align-items: stretch;
    }

    .search-box {
        min-width: 100%;
    }

    .search-box input {
        font-size: 0.8rem;
    }

    .search-box input::placeholder {
        font-size: 0.72rem;
    }

    .filters {
        flex-direction: column;
        width: 100%;
    }

    .filters select {
        width: 100%;
    }

    /* Tab Wraps for small screens */
    .category-tabs {
        flex-wrap: wrap;
    }

    .category-tab {
        flex: 1 1 45%;
        /* Two per row on mobile */
        padding: 0.5rem;
        font-size: 0.85rem;
    }

    .form-row {
        flex-direction: column;
        gap: 0;
    }

    .cost-breakdown {
        gap: 1rem;
        flex-direction: column;
        align-items: center;
    }

    .breakdown-item {
        width: 100%;
        max-width: 300px;
        text-align: center;
    }

    th,
    td {
        padding: 0.8rem 0.4rem;
        font-size: 0.85rem;
    }

    .table-container {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }

    table {
        min-width: 700px;
        /* Force table layout on small screens for swipe scroll */
    }

    .table-container::after {
        content: '← Swipe horizontally to view more →';
        display: block;
        text-align: center;
        font-size: 0.75rem;
        color: var(--text-secondary);
        padding: 0.5rem;
        margin-top: 0.5rem;
        opacity: 0.7;
    }
}