:root {
    --bg-color: oklch(15% 0.01 260); /* Deep Charcoal */
    --card-bg: oklch(20% 0.02 260);
    --text-primary: oklch(98% 0.01 260);
    --text-secondary: oklch(75% 0.01 260);
    --accent-color: oklch(85% 0.18 85); /* Signature PUBG Yellow */
    --accent-glow: oklch(85% 0.18 85 / 0.4);
    --danger-color: oklch(55% 0.22 25); /* Tactical Red */
    --danger-glow: oklch(55% 0.22 25 / 0.4);
    --info-color: oklch(70% 0.1 220); 
    --shadow-deep: 0 8px 32px -8px oklch(0% 0 0 / 0.7);
    --border-radius: 4px; /* More tactical, less rounded */
    --transition-base: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --btn-bg: oklch(30% 0.02 260);
    --canvas-bg: oklch(12% 0 0);
    --footer-bg: oklch(18% 0.02 260);
}

body.light-mode {
    --bg-color: oklch(92% 0.01 260);
    --card-bg: oklch(100% 0 0);
    --text-primary: oklch(15% 0.02 260);
    --text-secondary: oklch(40% 0.02 260);
    --accent-color: oklch(85% 0.18 85); /* Reverted to standard vibrant yellow */
    --accent-glow: oklch(85% 0.18 85 / 0.3);
    --danger-color: oklch(50% 0.2 25);
    --shadow-deep: 0 10px 30px -10px oklch(0% 0 0 / 0.15);
    --btn-bg: oklch(88% 0.02 260);
    --canvas-bg: oklch(98% 0 0);
    --footer-bg: oklch(85% 0.02 260);
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.4;
    display: flex;
    justify-content: center;
    padding: 0.5rem;
    min-height: 100vh;
    transition: background-color var(--transition-base), color var(--transition-base);
    overflow-x: hidden;
}

.app-container {
    max-width: 1200px;
    width: 100%;
    display: flex;
    flex-direction: row;
    gap: 1.5rem;
    min-height: 100vh;
    padding: 1rem;
}

.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    min-width: 0; /* Prevent flex overflow */
}

/* Sidebar Quotes & Ads */
.sidebar-quotes {
    width: 250px;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    padding-top: 7.8rem; /* Correctly aligned with control panel */
}

.ad-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.ad-disclosure {
    font-size: 0.65rem;
    color: var(--text-secondary);
    text-align: center;
    line-height: 1.2;
    padding: 0 0.5rem;
}

.mobile-ad {
    display: none; /* Hidden on desktop */
}

.quote-card {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-deep);
    border: 1px solid oklch(from var(--btn-bg) calc(l + 0.1) c h / 0.3);
    height: 110px; /* Force match with control panel height */
    display: flex;
    flex-direction: column;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.quote-card::before {
    content: '"';
    position: absolute;
    top: -5px;
    left: 8px;
    font-size: 4rem;
    opacity: 0.15;
    font-family: serif;
    color: var(--accent-color);
}

.quote-content {
    font-size: 0.9rem;
    font-weight: 600;
    line-height: 1.4;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
    transition: opacity 0.5s ease;
    z-index: 1;
}

.quote-author {
    font-size: 0.75rem;
    color: var(--accent-color);
    text-align: right;
    font-style: italic;
    transition: opacity 0.5s ease;
    z-index: 1;
}

.quote-fade-out {
    opacity: 0;
}

.top-utility-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 0.3rem;
    border-bottom: 1px solid oklch(from var(--btn-bg) calc(l + 0.05) c h / 0.3);
}

.lang-wrapper {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--card-bg);
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    box-shadow: var(--shadow-deep);
    border: 1px solid oklch(from var(--btn-bg) calc(l + 0.1) c h / 0.5);
}

.lang-icon {
    font-size: 0.9rem;
    opacity: 0.8;
}

.lang-select {
    padding: 0.2rem;
    font-size: 0.85rem;
    border: none !important;
    background: transparent !important;
    color: var(--text-primary);
    font-weight: 600;
    outline: none;
}

.lang-select option {
    background-color: var(--card-bg);
    color: var(--text-primary);
}

.utility-right {
    display: flex;
    align-items: center;
}

.btn-theme-mini {
    background: var(--card-bg);
    border: 1px solid oklch(from var(--btn-bg) calc(l + 0.1) c h / 0.5);
    border-radius: 20px;
    width: 38px;
    height: 38px;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    box-shadow: var(--shadow-deep);
    cursor: pointer;
}

header {
    text-align: center;
}

h1 {
    font-size: 2.8rem;
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: -0.05em;
    font-style: italic;
    color: var(--accent-color);
    text-shadow: 3px 3px 0px oklch(0% 0 0 / 0.5);
    margin-bottom: 0.2rem;
    line-height: 0.9;
}

.subtitle {
    color: var(--text-primary);
    font-size: 0.9rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    opacity: 0.8;
    border-left: 4px solid var(--accent-color);
    padding-left: 0.8rem;
    display: inline-block;
}

/* Controls */
.controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--card-bg);
    padding: 0.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-deep);
    flex-wrap: wrap;
    gap: 0.5rem;
    height: 110px; /* Fixed height for alignment */
}

.mode-selector {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.calibrate-group {
    display: flex;
    background: var(--btn-bg);
    border-radius: 8px;
    padding: 2px;
}

.calibrate-group .btn {
    background: transparent;
}

.calibrate-group .btn.active {
    background: var(--accent-color);
}

.dist-selector {
    display: flex;
    gap: 2px;
    padding-left: 2px;
    border-left: 1px solid oklch(from var(--btn-bg) calc(l + 0.1) c h);
}

.btn-dist {
    padding: 0.4rem 0.6rem;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.8rem;
    font-weight: 700;
    cursor: pointer;
    border-radius: 4px;
    transition: var(--transition-base);
}

.btn-dist:hover {
    color: var(--text-primary);
    background: oklch(from var(--btn-bg) calc(l + 0.05) c h);
}

.btn-dist.active {
    color: var(--accent-color);
    background: oklch(from var(--accent-color) calc(l) c h / 0.15);
}

body.light-mode .btn-dist.active {
    background: oklch(25% 0.02 260); /* Deep charcoal background */
    color: var(--accent-color); /* Bright yellow text */
    text-shadow: none;
    box-shadow: inset 0 2px 4px oklch(0% 0 0 / 0.3);
}

.btn {
    padding: 0.6rem 1.2rem;
    border: none;
    border-radius: var(--border-radius);
    background: var(--btn-bg);
    color: var(--text-primary);
    cursor: pointer;
    font-weight: 800;
    text-transform: uppercase;
    transition: var(--transition-base);
    border-bottom: 3px solid oklch(0% 0 0 / 0.3);
}

.btn:hover {
    background: oklch(from var(--btn-bg) calc(l + 0.05) c h);
    transform: translateY(-1px);
}

.btn.active {
    background: var(--accent-color);
    color: oklch(10% 0 0);
    box-shadow: 0 4px 15px var(--accent-glow);
    border-bottom-color: oklch(from var(--accent-color) calc(l - 0.2) c h);
}

.action-buttons {
    display: flex;
    gap: 0.5rem;
}

.btn-danger {
    background: oklch(30% 0.1 25);
    color: oklch(85% 0.1 25);
    border: 1px solid oklch(40% 0.1 25);
}

.btn-danger:hover {
    background: var(--danger-color);
    color: white;
    box-shadow: 0 0 15px var(--danger-glow);
}

body.light-mode .btn-danger {
    background: oklch(92% 0.05 25);
    color: var(--danger-color);
    border: 1px solid oklch(85% 0.1 25);
}

body.light-mode .btn-danger:hover {
    background: var(--danger-color);
    color: white;
}

/* Display Panel */
.display-panel {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 0.5rem;
}

.status-card, .result-card {
    background: var(--card-bg);
    padding: 0.8rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-deep);
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 0.3rem;
}

.result-card {
    flex-direction: row;
    justify-content: space-around;
    align-items: center;
}

.result-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.label {
    font-size: 0.7rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.value {
    font-size: 1rem;
    font-weight: 700;
}

.value.highlight {
    color: var(--accent-color);
    font-size: 1.2rem;
}

.status-on { color: var(--accent-color); }
.status-off { color: var(--danger-color); }
.status-warn { color: oklch(80% 0.15 80); }

/* Canvas Area */
.canvas-wrapper {
    position: relative;
    background: var(--canvas-bg);
    border-radius: var(--border-radius);
    border: 2px dashed oklch(from var(--canvas-bg) calc(l + 0.15) c h);
    flex: 1;
    min-height: 40vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    box-shadow: inset 0 0 20px oklch(0% 0 0 / 0.2);
    transition: background-color var(--transition-base);
    touch-action: none;
}

#mapCanvas {
    display: none;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.canvas-placeholder {
    color: var(--text-secondary);
    text-align: center;
    cursor: pointer;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    transition: var(--transition-base);
}

.placeholder-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.placeholder-icon {
    font-size: 3.5rem;
    filter: drop-shadow(0 0 10px var(--accent-glow));
    margin-bottom: 0.5rem;
}

.canvas-placeholder:hover {
    color: var(--text-primary);
    background: oklch(from var(--canvas-bg) calc(l + 0.03) c h);
}

.canvas-placeholder:active {
    transform: scale(0.98);
}

/* Manual & Guide */
.instructions {
    background: var(--footer-bg);
    padding: 1.2rem;
    border-radius: var(--border-radius);
    border: 1px solid oklch(from var(--btn-bg) calc(l + 0.1) c h / 0.5);
    position: relative;
}

.manual-title {
    font-size: 0.8rem;
    font-weight: 800;
    text-transform: uppercase;
    color: var(--accent-color);
    letter-spacing: 0.1em;
    margin-bottom: 1.2rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.manual-title::before {
    content: "SYSTEM::GUIDE";
    font-size: 0.6rem;
    padding: 0.2rem 0.4rem;
    background: var(--accent-color);
    color: var(--bg-color);
    border-radius: 2px;
}

.manual-flow {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

.manual-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    position: relative;
}

.manual-icon-box {
    width: 32px;
    height: 32px;
    background: var(--btn-bg);
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 0.9rem;
    color: var(--accent-color);
    border: 1px solid oklch(from var(--accent-color) calc(l) c h / 0.2);
}

.manual-num {
    font-weight: 900;
    font-family: monospace;
}

.manual-content h4 {
    font-size: 0.85rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 0.2rem;
    text-transform: uppercase;
}

.manual-content p {
    font-size: 0.75rem;
    color: var(--text-secondary);
    line-height: 1.6; /* Increased for readability */
}

.highlight-term {
    color: var(--accent-color);
    font-weight: 800;
    background: oklch(from var(--accent-color) calc(l) c h / 0.1);
    padding: 0.1rem 0.3rem;
    border-radius: 2px;
    border-bottom: 1px solid oklch(from var(--accent-color) calc(l) c h / 0.3);
}

body.light-mode .highlight-term {
    background: oklch(25% 0.02 260);
    color: var(--accent-color);
    border-bottom: none;
    padding: 0.15rem 0.4rem;
}

body.light-mode .manual-content p {
    color: oklch(25% 0.02 260); /* Much darker for light mode */
    font-weight: 500;
}

body.light-mode .instructions {
    background: oklch(93% 0.01 260); /* Slightly lighter but distinct */
    border-color: oklch(80% 0.02 260);
}

body.light-mode .manual-title {
    color: oklch(20% 0.02 260);
    font-weight: 900;
}

body.light-mode .manual-title::before {
    background: oklch(20% 0.02 260);
    color: var(--accent-color);
    font-weight: 900;
}

body.light-mode .manual-icon-box {
    background: oklch(20% 0.02 260);
    color: var(--accent-color);
    border: none;
    box-shadow: 0 2px 4px oklch(0% 0 0 / 0.1);
}

body.light-mode .manual-content h4 {
    color: oklch(10% 0.02 260);
    font-weight: 900;
}

.manual-separator {
    height: 1px;
    background: linear-gradient(to right, var(--accent-color) 0%, transparent 100%);
    opacity: 0.2;
    margin: 0.4rem 0;
}

.manual-item.utility {
    opacity: 0.8;
}

.manual-item.danger .manual-icon-box {
    color: var(--danger-color);
    border-color: oklch(from var(--danger-color) calc(l) c h / 0.3);
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
::-webkit-scrollbar-track {
    background: var(--bg-color);
}
::-webkit-scrollbar-thumb {
    background: oklch(40% 0.02 260);
    border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
    background: oklch(50% 0.02 260);
}

/* Blog Page Styles */
.blog-content {
    margin-top: 2rem;
    padding-bottom: 4rem;
}

.blog-section {
    margin-bottom: 2.5rem;
}

.blog-section h2 {
    font-size: 1.5rem;
    color: var(--accent-color);
    margin-bottom: 1rem;
    border-bottom: 2px solid oklch(from var(--accent-color) calc(l) c h / 0.2);
    padding-bottom: 0.5rem;
}

.blog-section h3 {
    font-size: 1.2rem;
    margin: 1.5rem 0 0.8rem 0;
    color: var(--text-primary);
}

.blog-section p {
    font-size: 1rem;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: 1.2rem;
}

.blog-section ul {
    margin-left: 1.5rem;
    margin-bottom: 1.2rem;
}

.blog-section li {
    margin-bottom: 0.8rem;
    line-height: 1.6;
    color: var(--text-secondary);
}

.faq-item {
    background: var(--card-bg);
    padding: 1rem;
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
    border-left: 4px solid var(--accent-color);
}

.faq-item p:last-child {
    margin-bottom: 0;
}

body.light-mode .blog-section p,
body.light-mode .blog-section li {
    color: oklch(25% 0.02 260);
}

@media (max-width: 900px) {
    .guide-grid { grid-template-columns: 1fr; }
    .app-container { 
        flex-direction: column; 
        height: auto;
        padding: 0.5rem;
    }
    .sidebar-quotes { 
        display: none; 
    }
    .mobile-ad {
        display: flex;
        width: 100%;
        margin-top: 1rem;
    }
    .mobile-ad iframe {
        max-width: 100%;
    }
    .controls { flex-direction: row; justify-content: space-between; height: auto; }
    .display-panel { grid-template-columns: 1fr; }
    .result-card { flex-direction: row; gap: 0.5rem; }
    .app-container { gap: 0.4rem; }
}

/* Blog Navigation Enhancement */
.blog-nav {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-top: 5rem;
    padding-top: 3rem;
    border-top: 1px solid var(--border-color);
}

.blog-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 3rem;
}

.blog-list-item {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    padding: 1.2rem;
    background: var(--card-bg);
    border: 1px solid oklch(from var(--btn-bg) calc(l + 0.1) c h / 0.3);
    border-radius: var(--border-radius);
    text-decoration: none;
    transition: all var(--transition-base);
}

.blog-list-item:hover {
    border-color: var(--accent-color);
    background: oklch(from var(--accent-color) calc(l) c h / 0.05);
    transform: translateX(10px);
}

.blog-list-item.active {
    border-left: 4px solid var(--accent-color);
    background: oklch(from var(--accent-color) calc(l) c h / 0.08);
}

.list-num {
    font-size: 1.5rem;
    font-weight: 900;
    color: var(--accent-color);
    opacity: 0.5;
    font-family: monospace;
}

.list-info h3 {
    font-size: 1.1rem;
    color: var(--text-primary);
    margin-bottom: 0.3rem;
}

.list-info p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0 !important;
}

.blog-nav-item {
    display: flex;
    flex-direction: column;
    padding: 1.5rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    text-decoration: none;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.blog-nav-item:hover {
    border-color: var(--accent-color);
    background: oklch(from var(--accent-color) calc(l + 0.05) c h / 0.05);
    transform: translateY(-4px);
    box-shadow: 0 10px 20px oklch(0% 0 0 / 0.1);
}

.blog-nav-label {
    font-size: 0.8rem;
    color: var(--accent-color);
    font-weight: 600;
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.blog-nav-title {
    font-size: 1.1rem;
    color: var(--text-color);
    font-weight: 500;
    line-height: 1.4;
}

.blog-nav-item.prev { text-align: left; }
.blog-nav-item.next { text-align: right; }

.blog-nav-item.next {
    grid-column: 2;
}

.blog-nav-item.prev::before {
    content: '←';
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.5rem;
    opacity: 0;
    transition: all var(--transition-base);
    color: var(--accent-color);
}

.blog-nav-item.next::after {
    content: '→';
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.5rem;
    opacity: 0;
    transition: all var(--transition-base);
    color: var(--accent-color);
}

.blog-nav-item.prev:hover { padding-left: 3rem; }
.blog-nav-item.next:hover { padding-right: 3rem; }

.blog-nav-item.prev:hover::before,
.blog-nav-item.next:hover::after {
    opacity: 1;
}

@media (max-width: 600px) {
    .blog-nav {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    .blog-nav-item.next {
        grid-column: 1;
    }
}