/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg-gradient-start: #0f172a;
    --bg-gradient-end: #1e293b;
    --glass-bg: rgba(30, 41, 59, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-color: #38bdf8;
    --accent-hover: #0ea5e9;
    --success-color: #4ade80;
    --danger-color: #f87171;
    --card-bg: rgba(15, 23, 42, 0.6);
}

body {
    font-family: 'Inter', 'Noto Sans KR', sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    min-height: 100vh;
    position: relative;
    overflow-x: hidden;
    font-weight: 400;
    background: linear-gradient(135deg, var(--bg-gradient-start), var(--bg-gradient-end));
}

/* Abstract Dynamic Background */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 10% 20%, rgba(56, 189, 248, 0.1) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(139, 92, 246, 0.1) 0%, transparent 40%);
    z-index: -2;
}

.background-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    backdrop-filter: blur(0px); /* Reduced global blur for performance */
    z-index: -1;
}

/* Header */
.header {
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
    padding: 1.5rem 0;
    margin-bottom: 2rem;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.8rem;
    letter-spacing: 1px;
}

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

.subtitle {
    font-size: 0.8rem;
    color: var(--text-secondary);
    display: none; /* Hidden on mobile, shown on desktop if needed */
}

@media (min-width: 768px) {
    .subtitle {
        display: block;
        margin-left: 1rem;
    }
    .header-content {
        justify-content: space-between;
    }
}

/* Exchange Rate Display */
.exchange-rate-display {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 0.2rem;
    background: rgba(255, 255, 255, 0.05);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    border: 1px solid var(--glass-border);
}

.rate-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.currency-change {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.refresh-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 0.8rem;
    padding: 0;
    transition: color 0.3s;
}

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

.rate-info {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.currency-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.currency-value {
    font-family: 'Inter', monospace;
    font-weight: 600;
    color: var(--accent-color);
    font-size: 1rem;
}

/* Main Container */
.main-container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 1.5rem 3rem;
}

/* Calculator Wrapper */
.calculator-wrapper {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border-radius: 16px;
    border: 1px solid var(--glass-border);
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

/* Settings Bar */
.settings-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--glass-border);
}

.input-item {
    position: relative;
    flex: 1;
    min-width: 200px;
}

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

.input-item input {
    width: 100%;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--glass-border);
    padding: 0.8rem 1rem 0.8rem 2.5rem;
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.input-item input:focus {
    outline: none;
    border-color: var(--accent-color);
}

.toggle-item {
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

.toggle-switch {
    position: relative;
    display: inline-block;
    width: 48px;
    height: 24px;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(255, 255, 255, 0.1);
    transition: .4s;
    border-radius: 24px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
}

input:checked + .slider {
    background-color: var(--accent-color);
}

input:checked + .slider:before {
    transform: translateX(24px);
}

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

/* Tabs */
.tabs {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
}

.tab-btn {
    flex: 1;
    background: transparent;
    border: 1px solid var(--glass-border);
    padding: 1rem;
    border-radius: 8px;
    color: var(--text-secondary);
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.tab-btn.active {
    background: rgba(56, 189, 248, 0.1);
    border-color: var(--accent-color);
    color: var(--accent-color);
    font-weight: 600;
}

.tab-btn:hover:not(.active) {
    background: rgba(255, 255, 255, 0.05);
}

/* Calculator Section */
.input-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.section-group {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: 12px;
    border: 1px solid var(--glass-border);
}

.section-group h3 {
    font-size: 1.1rem;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    border-bottom: 1px solid var(--glass-border);
    padding-bottom: 0.8rem;
}

.section-group h3 i {
    color: var(--accent-color);
}

.input-group {
    margin-bottom: 1.2rem;
}

.input-group label {
    display: block;
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-bottom: 0.5rem;
}

.input-group input {
    width: 100%;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--glass-border);
    padding: 0.8rem;
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 1.1rem;
    font-weight: 500;
    transition: all 0.3s;
}

.input-group input:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 2px rgba(56, 189, 248, 0.2);
}

/* Calc Mode Tabs */
.calc-mode-tabs {
    display: flex;
    margin-bottom: 1.2rem;
    background: rgba(0, 0, 0, 0.2);
    padding: 0.3rem;
    border-radius: 6px;
}

.mode-btn {
    flex: 1;
    background: transparent;
    border: none;
    padding: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.85rem;
    cursor: pointer;
    border-radius: 4px;
    transition: all 0.3s;
}

.mode-btn.active {
    background: var(--glass-bg);
    color: var(--text-primary);
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

.mode-content {
    display: none;
}

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

.input-group.highlight input {
    border-color: var(--accent-color);
    background: rgba(56, 189, 248, 0.05);
}

.help-text {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-top: 0.5rem;
    font-style: italic;
}

/* Advanced Options */
.advanced-options {
    margin-top: 1rem;
}

/* Action Buttons */
.action-buttons {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
}

.calculate-btn, .reset-btn {
    padding: 1rem 2rem;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.calculate-btn {
    flex: 2;
    background: var(--accent-color);
    color: #0f172a;
    border: none;
}

.calculate-btn:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
}

.reset-btn {
    flex: 1;
    background: transparent;
    border: 1px solid var(--glass-border);
    color: var(--text-secondary);
}

.reset-btn:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
}

/* Results Dashboard */
.results-section {
    animation: fadeIn 0.5s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.results-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.results-toolbar h2 {
    font-size: 1.5rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.save-btn {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid var(--glass-border);
    color: var(--text-primary);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.3s;
}

.save-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

.capture-container {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border-radius: 16px;
    border: 1px solid var(--glass-border);
    padding: 2rem;
    position: relative;
    overflow: hidden; /* For watermark */
}

/* 0. Target Action Card */
.target-action-card {
    background: linear-gradient(135deg, #0ea5e9 0%, #6366f1 100%);
    color: white;
    padding: 2rem;
    border-radius: 16px;
    margin-bottom: 2rem;
    display: flex;
    align-items: center;
    gap: 2rem;
    box-shadow: 0 10px 25px -5px rgba(99, 102, 241, 0.4);
    animation: pulseGlow 2s infinite alternate;
}

@keyframes pulseGlow {
    from { box-shadow: 0 10px 25px -5px rgba(99, 102, 241, 0.4); }
    to { box-shadow: 0 10px 35px 2px rgba(14, 165, 233, 0.6); }
}

.action-icon {
    width: 70px;
    height: 70px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    flex-shrink: 0;
}

.action-label {
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    opacity: 0.9;
    margin-bottom: 0.5rem;
}

.action-title {
    font-size: 1.5rem;
    line-height: 1.4;
    font-weight: 700;
}

.action-highlight {
    font-size: 2.5rem;
    color: #fff;
    text-shadow: 0 2px 10px rgba(0,0,0,0.2);
    text-decoration: underline;
    text-underline-offset: 8px;
    margin: 0 5px;
}

/* 1. Insight Banner */
.insight-banner {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.insight-item {
    flex: 1;
    background: rgba(0, 0, 0, 0.2);
    padding: 1.5rem;
    border-radius: 12px;
    border: 1px solid var(--glass-border);
    min-width: 250px;
}

.insight-label {
    display: block;
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.8rem;
}

.insight-value-group {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 1.4rem;
    font-weight: 600;
}

.old-value { color: var(--text-secondary); text-decoration: line-through; font-size: 1.1rem; }
.new-value { color: var(--accent-color); }

.insight-change.badge {
    display: inline-block;
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.8rem;
    margin-top: 0.5rem;
    font-weight: 600;
}

.badge.good { background: rgba(74, 222, 128, 0.2); color: var(--success-color); }
.badge.bad { background: rgba(248, 113, 113, 0.2); color: var(--danger-color); }

.main-value {
    display: block;
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-primary);
}

.sub-value {
    display: block;
    font-size: 1rem;
    color: var(--text-secondary);
    margin-top: 0.3rem;
}

/* 2. Charts */
.charts-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.chart-box {
    background: rgba(255, 255, 255, 0.03);
    padding: 1.5rem;
    border-radius: 12px;
    border: 1px solid var(--glass-border);
}

.chart-box h4 {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    font-weight: 500;
}

.chart-wrapper {
    height: 200px;
    position: relative;
}

/* 3. Data Grid */
.data-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.data-card {
    background: rgba(0, 0, 0, 0.2);
    border-radius: 12px;
    padding: 1.5rem;
}

.card-header {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--glass-border);
}

.row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.8rem;
}

.row span { color: var(--text-secondary); font-size: 0.9rem; }
.row strong { color: var(--text-primary); font-weight: 500; }
.row strong.highlight { color: var(--accent-color); }

/* 4. Scenario */
.scenario-box {
    background: linear-gradient(90deg, rgba(56, 189, 248, 0.1), rgba(30, 41, 59, 0.5));
    border-left: 4px solid var(--accent-color);
    padding: 1.5rem;
    border-radius: 8px;
}

.scenario-box h4 {
    color: var(--accent-color);
    margin-bottom: 0.5rem;
}

.scenario-box p {
    color: var(--text-primary);
    font-size: 1rem;
}

.watermark {
    position: absolute;
    bottom: 1rem;
    right: 1.5rem;
    color: rgba(255, 255, 255, 0.05);
    font-size: 1.5rem;
    font-weight: 800;
    pointer-events: none;
    text-transform: uppercase;
}

/* Footer */
.footer {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-top: 3rem;
}

/* Responsive */
@media (max-width: 768px) {
    .calculator-wrapper, .capture-container {
        padding: 1.5rem;
    }
    
    .insight-banner {
        flex-direction: column;
    }
}

/* Content Guide Section (SEO Optimized) */
.content-guide-section {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border-radius: 16px;
    border: 1px solid var(--glass-border);
    padding: 3rem 2rem;
    margin-bottom: 3rem;
    color: var(--text-secondary);
}

.guide-article h2 {
    color: var(--text-primary);
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid var(--glass-border);
    padding-bottom: 0.5rem;
}

.guide-article h3 {
    color: var(--text-primary);
    font-size: 1.2rem;
    margin-top: 2rem;
    margin-bottom: 1rem;
}

.guide-article p {
    margin-bottom: 1rem;
    line-height: 1.7;
}

.guide-article ul {
    list-style-type: disc;
    padding-left: 1.5rem;
    margin-bottom: 1.5rem;
}

.guide-article li {
    margin-bottom: 0.5rem;
}

.disclaimer-box {
    margin-top: 3rem;
    background: rgba(255, 255, 255, 0.03);
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    font-size: 0.85rem;
}

.disclaimer-box h4 {
    color: var(--danger-color);
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

/* Footer Links */
.footer-links {
    margin-top: 1rem;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
    transition: color 0.3s;
}

.footer-links a:hover {
    color: var(--text-primary);
    text-decoration: underline;
}