/* ==========================================================================
   Relationship (사람) Official Marketing Website Design System
   Strictly aligned with Linear's Dark-Canvas Marketing System (website_desingMD)
   + Full Mobile-First Korean Typography & Responsive Optimization
   ========================================================================== */

:root {
    /* 1. Surface Ladder (Four-Step Dark Canvas Hierarchy) */
    --color-canvas: #010102;
    --color-surface-1: #090a0f;
    --color-surface-2: #11131a;
    --color-surface-3: #191b24;
    --color-surface-4: #222530;

    /* Inverse Surfaces */
    --color-inverse-canvas: #ffffff;
    --color-inverse-surface-1: #f4f5f8;
    --color-inverse-ink: #010102;

    /* Hairline Borders (Zero drop-shadow hierarchy) */
    --color-hairline: #23252a;
    --color-hairline-strong: #343741;
    --color-hairline-tertiary: #181a20;
    --edge-highlight: inset 0 1px 0 0 rgba(255, 255, 255, 0.06);

    /* 2. Single Chromatic Brand Accent (Linear Lavender-Blue) */
    --color-primary: #5e6ad2;
    --color-primary-hover: #828fff;
    --color-primary-focus: #5e69d1;
    --color-on-primary: #ffffff;

    /* 3. Semantic Color */
    --color-semantic-success: #27a644;
    --color-semantic-overlay: rgba(1, 1, 2, 0.82);

    /* 4. Typography Ink Hierarchy */
    --color-ink: #f7f8f8;
    --color-ink-muted: #d0d6e0;
    --color-ink-subtle: #8a8f98;
    --color-ink-tertiary: #62666d;

    /* 5. Font Families */
    --font-display: "Pretendard Variable", Pretendard, "Inter", -apple-system, BlinkMacSystemFont, "SF Pro Display", system-ui, sans-serif;
    --font-text: "Pretendard Variable", Pretendard, "Inter", -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
    --font-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;

    /* 6. Spacing System (Base unit: 4px) */
    --spacing-xxs: 4px;
    --spacing-xs: 8px;
    --spacing-sm: 12px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-xxl: 48px;
    --spacing-section: 96px;

    /* 7. Border Radius Scale */
    --rounded-xs: 4px;
    --rounded-sm: 6px;
    --rounded-md: 8px;
    --rounded-lg: 12px;
    --rounded-xl: 16px;
    --rounded-xxl: 24px;
    --rounded-pill: 9999px;
    --rounded-full: 9999px;
}

/* ==========================================================================
   Reset & Base Canvas
   ========================================================================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    background-color: var(--color-canvas);
    color: var(--color-ink);
    font-family: var(--font-text);
    font-size: 16px;
    line-height: 1.5;
    letter-spacing: -0.05px;
    scroll-behavior: smooth;
    word-break: keep-all;
    overflow-wrap: break-word;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    -webkit-text-size-adjust: 100%;
}

body {
    background-color: var(--color-canvas);
    color: var(--color-ink);
    overflow-x: hidden;
    width: 100%;
}

::selection {
    background: rgba(94, 106, 210, 0.35);
    color: var(--color-ink);
}

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

button, input {
    font-family: inherit;
    border: none;
    background: none;
    color: inherit;
}

/* ==========================================================================
   Typography Tokens
   ========================================================================== */
.t-display-xl {
    font-family: var(--font-display);
    font-size: clamp(2.1rem, 5vw, 4.35rem);
    font-weight: 600;
    line-height: 1.14;
    letter-spacing: -0.035em;
    color: var(--color-ink);
}

.t-display-lg {
    font-family: var(--font-display);
    font-size: clamp(1.65rem, 3.6vw, 3.1rem);
    font-weight: 600;
    line-height: 1.18;
    letter-spacing: -0.03em;
    color: var(--color-ink);
}

.t-display-md {
    font-family: var(--font-display);
    font-size: clamp(1.35rem, 2.6vw, 2.2rem);
    font-weight: 600;
    line-height: 1.24;
    letter-spacing: -0.025em;
    color: var(--color-ink);
}

.t-headline {
    font-family: var(--font-display);
    font-size: clamp(1.2rem, 2.1vw, 1.65rem);
    font-weight: 600;
    line-height: 1.3;
    letter-spacing: -0.5px;
    color: var(--color-ink);
}

.t-card-title {
    font-family: var(--font-display);
    font-size: 1.15rem;
    font-weight: 600;
    line-height: 1.35;
    letter-spacing: -0.3px;
    color: var(--color-ink);
}

.t-subhead {
    font-size: 1.125rem;
    font-weight: 400;
    line-height: 1.55;
    letter-spacing: -0.2px;
    color: var(--color-ink-muted);
}

.t-body-lg {
    font-size: 1.05rem;
    font-weight: 400;
    line-height: 1.62;
    letter-spacing: -0.1px;
    color: var(--color-ink-muted);
}

.t-body {
    font-size: 0.975rem;
    font-weight: 400;
    line-height: 1.6;
    letter-spacing: -0.05px;
    color: var(--color-ink-muted);
}

.t-body-sm {
    font-size: 0.875rem;
    font-weight: 400;
    line-height: 1.58;
    letter-spacing: 0;
    color: var(--color-ink-subtle);
}

.t-caption {
    font-size: 0.75rem;
    font-weight: 400;
    line-height: 1.45;
    letter-spacing: 0;
    color: var(--color-ink-subtle);
}

.t-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.75rem;
    font-weight: 600;
    line-height: 1.3;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    color: var(--color-primary-hover);
}

.t-eyebrow::before {
    content: "";
    display: inline-block;
    width: 6px;
    height: 6px;
    border-radius: var(--rounded-full);
    background-color: var(--color-primary);
    flex-shrink: 0;
}

.t-mono {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 400;
    line-height: 1.45;
    letter-spacing: 0;
}

/* ==========================================================================
   Layout & Grid Containers
   ========================================================================== */
.container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.section {
    padding: var(--spacing-section) 0;
    border-bottom: 1px solid var(--color-hairline-tertiary);
}

.section-header {
    max-width: 780px;
    margin-bottom: var(--spacing-xxl);
}

.section-header.center {
    margin-left: auto;
    margin-right: auto;
    text-align: center;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--spacing-lg);
}

.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--spacing-lg);
}

.compare-2col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.stat-3col {
    margin-top: 16px;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
}

/* ==========================================================================
   Buttons & Interactive Controls (Linear Compact Spec)
   ========================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-size: 0.875rem;
    font-weight: 500;
    line-height: 1.25;
    padding: 9px 16px;
    min-height: 40px;
    border-radius: var(--rounded-md);
    cursor: pointer;
    transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease, transform 0.1s ease;
    white-space: nowrap;
    user-select: none;
    text-align: center;
}

.btn:active {
    transform: scale(0.98);
}

.btn:focus-visible {
    outline: 2px solid rgba(94, 105, 209, 0.5);
    outline-offset: 2px;
}

.btn-lg {
    padding: 12px 22px;
    min-height: 46px;
    font-size: 0.9375rem;
}

.btn-primary {
    background-color: var(--color-primary);
    color: var(--color-on-primary);
    box-shadow: inset 0 1px 0 0 rgba(255, 255, 255, 0.18);
}

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

.btn-primary:active {
    background-color: var(--color-primary-focus);
}

.btn-secondary {
    background-color: var(--color-surface-1);
    color: var(--color-ink);
    border: 1px solid var(--color-hairline);
    box-shadow: var(--edge-highlight);
}

.btn-secondary:hover {
    background-color: var(--color-surface-2);
    border-color: var(--color-hairline-strong);
}

.btn-inverse {
    background-color: var(--color-inverse-canvas);
    color: var(--color-inverse-ink);
    font-weight: 600;
}

.btn-inverse:hover {
    background-color: var(--color-inverse-surface-1);
}

/* ==========================================================================
   Status Badges & Pills
   ========================================================================== */
.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background-color: var(--color-surface-2);
    border: 1px solid var(--color-hairline);
    color: var(--color-ink-muted);
    font-size: 0.75rem;
    font-weight: 500;
    padding: 5px 12px;
    border-radius: var(--rounded-pill);
    box-shadow: var(--edge-highlight);
    max-width: 100%;
}

.status-dot {
    width: 7px;
    height: 7px;
    border-radius: var(--rounded-full);
    background-color: var(--color-semantic-success);
    flex-shrink: 0;
}

/* ==========================================================================
   Cards & Surface Ladder Panels
   ========================================================================== */
.feature-card {
    background-color: var(--color-surface-1);
    border: 1px solid var(--color-hairline);
    border-radius: var(--rounded-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--edge-highlight);
    transition: background-color 0.2s ease, border-color 0.2s ease;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.feature-card:hover {
    background-color: var(--color-surface-2);
    border-color: var(--color-hairline-strong);
}

.product-screenshot-card {
    background-color: var(--color-surface-1);
    border: 1px solid var(--color-hairline);
    border-radius: var(--rounded-xl);
    padding: var(--spacing-lg);
    box-shadow: var(--edge-highlight);
    overflow: hidden;
}

/* ==========================================================================
   Sticky Top Navigation (top-nav)
   ========================================================================== */
.top-nav {
    position: sticky;
    top: 0;
    z-index: 100;
    height: 56px;
    background-color: rgba(1, 1, 2, 0.88);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--color-hairline);
}

.top-nav-inner {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-sm);
}

.brand-logo {
    display: inline-flex;
    align-items: center;
    gap: 9px;
    font-weight: 600;
    font-size: 0.95rem;
    letter-spacing: -0.3px;
    color: var(--color-ink);
    flex-shrink: 0;
}

.brand-logo-mark {
    width: 26px;
    height: 26px;
    border-radius: 6px;
    background-color: var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    box-shadow: inset 0 1px 0 rgba(255,255,255,0.25);
    flex-shrink: 0;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 24px;
}

.nav-link {
    font-size: 0.875rem;
    color: var(--color-ink-subtle);
    transition: color 0.15s ease;
}

.nav-link:hover {
    color: var(--color-ink);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.mobile-menu-toggle {
    display: none;
    width: 38px;
    height: 38px;
    border-radius: var(--rounded-md);
    border: 1px solid var(--color-hairline);
    background-color: var(--color-surface-1);
    align-items: center;
    justify-content: center;
    cursor: pointer;
    flex-shrink: 0;
}

/* ==========================================================================
   Hero Section & Protagonist Interactive App UI Mockup
   ========================================================================== */
.hero-section {
    padding: 64px 0 var(--spacing-section);
    border-bottom: 1px solid var(--color-hairline-tertiary);
}

.hero-copy {
    max-width: 920px;
    margin-bottom: var(--spacing-xxl);
}

.hero-badge-row {
    margin-bottom: var(--spacing-lg);
}

.hero-headline-accent {
    color: var(--color-primary-hover);
}

.hero-subhead {
    max-width: 720px;
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.hero-cta-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 12px;
}

.hero-meta-note {
    margin-top: var(--spacing-md);
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 12px 18px;
    font-size: 0.8125rem;
    color: var(--color-ink-subtle);
}

.hero-meta-item {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

/* Protagonist App Window Frame */
.app-window {
    background-color: var(--color-canvas);
    border: 1px solid var(--color-hairline);
    border-radius: var(--rounded-lg);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.app-window-topbar {
    min-height: 44px;
    background-color: var(--color-surface-1);
    border-bottom: 1px solid var(--color-hairline);
    padding: 8px 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.window-dots {
    display: flex;
    align-items: center;
    gap: 6px;
    flex-shrink: 0;
}

.window-dot {
    width: 10px;
    height: 10px;
    border-radius: var(--rounded-full);
    background-color: var(--color-surface-4);
    border: 1px solid var(--color-hairline-strong);
}

.app-window-body {
    display: grid;
    grid-template-columns: 330px minmax(0, 1fr);
    min-height: 520px;
}

/* Mockup Left Sidebar */
.mockup-sidebar {
    background-color: var(--color-surface-1);
    border-right: 1px solid var(--color-hairline);
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.mockup-sidebar-header {
    padding: 14px;
    border-bottom: 1px solid var(--color-hairline);
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.mockup-quick-add {
    display: flex;
    gap: 6px;
}

.mockup-input {
    flex: 1;
    min-width: 0;
    background-color: var(--color-surface-2);
    border: 1px solid var(--color-hairline);
    border-radius: var(--rounded-md);
    padding: 7px 10px;
    font-size: 0.78rem;
    color: var(--color-ink);
}

.mockup-input:focus {
    outline: 2px solid rgba(94, 105, 209, 0.5);
}

.mockup-filter-pills {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.mockup-pill {
    font-size: 0.74rem;
    font-weight: 500;
    padding: 5px 10px;
    border-radius: var(--rounded-sm);
    background-color: var(--color-surface-2);
    color: var(--color-ink-subtle);
    border: 1px solid transparent;
    cursor: pointer;
    transition: all 0.15s ease;
}

.mockup-pill.active {
    background-color: var(--color-surface-3);
    color: var(--color-ink);
    border-color: var(--color-hairline-strong);
}

.mockup-contact-list {
    flex: 1;
    padding: 10px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    overflow-y: auto;
}

.mockup-contact-card {
    padding: 12px;
    border-radius: var(--rounded-md);
    background-color: var(--color-surface-2);
    border: 1px solid var(--color-hairline);
    cursor: pointer;
    transition: all 0.15s ease;
    min-width: 0;
}

.mockup-contact-card:hover {
    background-color: var(--color-surface-3);
}

.mockup-contact-card.selected {
    background-color: var(--color-surface-3);
    border-color: var(--color-primary);
    box-shadow: 0 0 0 1px var(--color-primary);
}

.mockup-sidebar-footer {
    padding: 12px;
    border-top: 1px solid var(--color-hairline);
    background-color: var(--color-surface-1);
}

/* Mockup Right Detail & Timeline Workspace */
.mockup-workspace {
    background-color: var(--color-canvas);
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.mockup-profile-banner {
    padding: 20px 24px;
    background-color: var(--color-surface-1);
    border-bottom: 1px solid var(--color-hairline);
}

.mockup-profile-top {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
    flex-wrap: wrap;
}

.mockup-avatar {
    width: 44px;
    height: 44px;
    border-radius: var(--rounded-full);
    background-color: var(--color-surface-3);
    border: 1px solid var(--color-hairline-strong);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--color-primary-hover);
    flex-shrink: 0;
}

.mockup-tag {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 3px 8px;
    border-radius: var(--rounded-xs);
    font-size: 0.72rem;
    font-weight: 500;
    background-color: var(--color-surface-3);
    border: 1px solid var(--color-hairline-strong);
    color: var(--color-ink-muted);
    white-space: nowrap;
}

.mockup-tag.primary {
    border-color: rgba(94, 106, 210, 0.5);
    color: var(--color-primary-hover);
}

.mockup-profile-traits {
    margin-top: 12px;
    padding: 10px 14px;
    border-radius: var(--rounded-md);
    background-color: var(--color-surface-2);
    border: 1px solid var(--color-hairline);
    display: flex;
    flex-wrap: wrap;
    gap: 8px 16px;
    font-size: 0.78rem;
    color: var(--color-ink-muted);
}

.mockup-timeline-feed {
    padding: 20px 24px;
    display: flex;
    flex-direction: column;
    gap: 14px;
    flex: 1;
    min-width: 0;
}

.timeline-item {
    position: relative;
    padding: 16px;
    border-radius: var(--rounded-lg);
    background-color: var(--color-surface-1);
    border: 1px solid var(--color-hairline);
    box-shadow: var(--edge-highlight);
    min-width: 0;
}

.timeline-item.pinned {
    border-color: rgba(94, 106, 210, 0.45);
    background-color: var(--color-surface-2);
}

.timeline-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 8px;
    font-size: 0.75rem;
    color: var(--color-ink-subtle);
}

/* Simulated Audio Player in Timeline */
.audio-player-bar {
    margin-top: 10px;
    padding: 10px 12px;
    border-radius: var(--rounded-md);
    background-color: var(--color-surface-2);
    border: 1px solid var(--color-hairline-strong);
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: 0;
}

.audio-play-btn {
    width: 32px;
    height: 32px;
    border-radius: var(--rounded-full);
    background-color: var(--color-primary);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    flex-shrink: 0;
}

.audio-waveform {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 2px;
    height: 20px;
    min-width: 0;
    overflow: hidden;
}

.wave-bar {
    flex: 1;
    min-width: 2px;
    background-color: var(--color-hairline-strong);
    border-radius: 2px;
    transition: height 0.2s ease, background-color 0.2s ease;
}

.wave-bar.active {
    background-color: var(--color-primary-hover);
}

/* ==========================================================================
   6 Core Pillars Bento Section
   ========================================================================== */
.pillar-block {
    display: grid;
    grid-template-columns: 5fr 7fr;
    gap: var(--spacing-xl);
    align-items: center;
    padding: var(--spacing-xl);
    background-color: var(--color-surface-1);
    border: 1px solid var(--color-hairline);
    border-radius: var(--rounded-xl);
    box-shadow: var(--edge-highlight);
    margin-bottom: var(--spacing-lg);
}

.pillar-block.reverse {
    grid-template-columns: 7fr 5fr;
}

.pillar-number {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--color-primary-hover);
    padding: 3px 8px;
    border-radius: var(--rounded-xs);
    background-color: var(--color-surface-2);
    border: 1px solid var(--color-hairline);
    display: inline-block;
    margin-bottom: 12px;
}

.pillar-list {
    margin-top: 16px;
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.pillar-list li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    font-size: 0.9rem;
    line-height: 1.55;
    color: var(--color-ink-muted);
}

.pillar-check {
    color: var(--color-semantic-success);
    font-weight: 700;
    flex-shrink: 0;
    margin-top: 1px;
}

.pillar-ui-frame {
    background-color: var(--color-canvas);
    border: 1px solid var(--color-hairline);
    border-radius: var(--rounded-lg);
    padding: 20px;
    position: relative;
    min-width: 0;
}

/* Hybrid Image Slot Support */
.hybrid-visual-slot {
    position: relative;
    min-width: 0;
}

.custom-screenshot-img {
    width: 100%;
    height: auto;
    border-radius: var(--rounded-md);
    display: none;
    border: 1px solid var(--color-hairline);
}

.hybrid-visual-slot.has-custom-image .custom-screenshot-img {
    display: block;
}

.hybrid-visual-slot.has-custom-image .code-mockup-fallback {
    display: none;
}

/* ==========================================================================
   Synergy Diagram (Who x Timeline)
   ========================================================================== */
.synergy-grid {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 20px;
    align-items: stretch;
}

.synergy-operator {
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-mono);
    font-size: 1.5rem;
    color: var(--color-primary-hover);
    padding: 0 8px;
}

/* ==========================================================================
   Real-World Business Scenarios (Interactive Tabs + Hybrid Visuals)
   ========================================================================== */
.scenario-tabs {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 8px;
    margin-bottom: var(--spacing-xl);
    padding: 6px;
    background-color: var(--color-surface-1);
    border: 1px solid var(--color-hairline);
    border-radius: var(--rounded-lg);
}

.scenario-tab-btn {
    padding: 10px 14px;
    border-radius: var(--rounded-md);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-ink-subtle);
    cursor: pointer;
    transition: all 0.15s ease;
    text-align: left;
    border: 1px solid transparent;
}

.scenario-tab-btn:hover {
    color: var(--color-ink);
}

.scenario-tab-btn.active {
    background-color: var(--color-surface-2);
    color: var(--color-ink);
    border-color: var(--color-hairline-strong);
    box-shadow: var(--edge-highlight);
}

.scenario-panel {
    display: none;
    grid-template-columns: 5fr 7fr;
    gap: var(--spacing-xl);
    background-color: var(--color-surface-1);
    border: 1px solid var(--color-hairline);
    border-radius: var(--rounded-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--edge-highlight);
}

.scenario-panel.active {
    display: grid;
}

/* ==========================================================================
   Pricing Section (Linear Pricing Spec)
   ========================================================================== */
.pricing-toggle-wrap {
    display: inline-flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 4px;
    padding: 4px;
    background-color: var(--color-surface-1);
    border: 1px solid var(--color-hairline);
    border-radius: var(--rounded-pill);
    margin-bottom: var(--spacing-xl);
    max-width: 100%;
}

.pricing-tab {
    padding: 7px 14px;
    border-radius: var(--rounded-pill);
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--color-ink-subtle);
    cursor: pointer;
    transition: all 0.15s ease;
}

.pricing-tab.selected {
    background-color: var(--color-surface-2);
    color: var(--color-ink);
    box-shadow: var(--edge-highlight);
}

.pricing-card {
    background-color: var(--color-surface-1);
    border: 1px solid var(--color-hairline);
    border-radius: var(--rounded-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--edge-highlight);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.pricing-card.featured {
    background-color: var(--color-surface-2);
    border-color: var(--color-hairline-strong);
    position: relative;
}

.price-value {
    font-family: var(--font-display);
    font-size: 2.35rem;
    font-weight: 600;
    letter-spacing: -1.5px;
    color: var(--color-ink);
}

.pricing-features {
    list-style: none;
    margin: 24px 0 32px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.pricing-features li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    font-size: 0.9rem;
    color: var(--color-ink-muted);
}

/* ==========================================================================
   CTA Banner & Footer
   ========================================================================== */
.cta-banner {
    background-color: var(--color-surface-1);
    border: 1px solid var(--color-hairline);
    border-radius: var(--rounded-lg);
    padding: var(--spacing-xxl);
    box-shadow: var(--edge-highlight);
    text-align: center;
}

.site-footer {
    padding: 64px 0;
    background-color: var(--color-canvas);
    color: var(--color-ink-subtle);
    font-size: 0.8125rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--spacing-xl);
}

.footer-col h4 {
    color: var(--color-ink);
    font-size: 0.8125rem;
    font-weight: 600;
    margin-bottom: 14px;
}

.footer-col ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-col a:hover {
    color: var(--color-ink);
}

/* ==========================================================================
   Responsive Breakpoints (1024px Tablet / 768px Mobile-Lg / 480px Mobile)
   ========================================================================== */
@media (max-width: 1024px) {
    .grid-3 {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
    .app-window-body {
        grid-template-columns: 280px minmax(0, 1fr);
    }
    .pillar-block,
    .pillar-block.reverse,
    .scenario-panel.active {
        grid-template-columns: 1fr;
    }
    /* On tablet/mobile, always show copy BEFORE the visual mockup even on reverse blocks */
    .pillar-block.reverse > .pillar-ui-frame {
        order: 2;
    }
    .pillar-block.reverse > div:not(.pillar-ui-frame) {
        order: 1;
    }
    .scenario-tabs {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
    .synergy-grid {
        grid-template-columns: 1fr;
    }
    .synergy-operator {
        padding: 2px 0;
    }
}

@media (max-width: 768px) {
    :root {
        --spacing-section: 56px;
        --spacing-xxl: 32px;
        --spacing-xl: 20px;
        --spacing-lg: 16px;
    }

    .container {
        padding: 0 16px;
    }

    /* Hide forced desktop line breaks so Korean text flows naturally on narrow screens */
    .pc-br {
        display: none;
    }

    /* Typography mobile calibration */
    .t-display-xl {
        font-size: 1.85rem;
        line-height: 1.24;
        letter-spacing: -0.028em;
    }
    .t-display-lg {
        font-size: 1.48rem;
        line-height: 1.28;
        letter-spacing: -0.025em;
    }
    .t-display-md {
        font-size: 1.25rem;
        line-height: 1.32;
    }
    .t-subhead,
    .t-body-lg {
        font-size: 0.9375rem;
        line-height: 1.58;
    }

    /* Top Nav Mobile Clean Up */
    .nav-hide-mobile {
        display: none !important;
    }
    .nav-actions .btn-primary {
        padding: 7px 12px;
        min-height: 34px;
        font-size: 0.8125rem;
    }
    .nav-links {
        display: none;
        position: absolute;
        top: 56px;
        left: 0;
        right: 0;
        background-color: var(--color-surface-1);
        border-bottom: 1px solid var(--color-hairline-strong);
        flex-direction: column;
        padding: 18px 20px;
        gap: 16px;
        align-items: flex-start;
        box-shadow: 0 16px 32px rgba(0, 0, 0, 0.65);
    }
    .nav-links.open {
        display: flex;
    }
    .mobile-menu-toggle {
        display: inline-flex;
    }

    /* Hero Section Mobile */
    .hero-section {
        padding: 36px 0 52px;
    }
    .status-badge {
        font-size: 0.7rem;
        padding: 4px 10px;
    }
    .hero-cta-row {
        flex-direction: column;
        align-items: stretch;
    }
    .hero-cta-row .btn {
        width: 100%;
    }
    .hero-meta-note {
        font-size: 0.76rem;
        gap: 8px 14px;
    }

    /* Protagonist App Window Mobile Transformation */
    .product-screenshot-card {
        padding: 10px;
        border-radius: var(--rounded-lg);
    }
    .app-window-topbar {
        padding: 8px 12px;
    }
    .app-window-topbar .window-title-text {
        display: none;
    }
    .app-window-body {
        grid-template-columns: 1fr;
        min-height: auto;
    }
    .mockup-sidebar {
        border-right: none;
        border-bottom: 1px solid var(--color-hairline);
    }
    .mockup-sidebar-header {
        padding: 10px 12px;
    }
    /* Horizontal swipeable contact strip on mobile instead of tall vertical stack */
    .mockup-contact-list {
        flex-direction: row;
        overflow-x: auto;
        overflow-y: hidden;
        padding: 10px 12px;
        gap: 8px;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
    }
    .mockup-contact-list::-webkit-scrollbar {
        display: none;
    }
    .mockup-contact-card {
        min-width: 215px;
        max-width: 235px;
        flex-shrink: 0;
        padding: 10px;
    }
    .mockup-sidebar-footer {
        display: none;
    }
    .mockup-profile-banner {
        padding: 14px;
    }
    .mockup-timeline-feed {
        padding: 14px;
        gap: 10px;
    }
    .timeline-item {
        padding: 12px;
    }

    /* Grids & Cards Mobile */
    .grid-3,
    .grid-2,
    .compare-2col {
        grid-template-columns: 1fr;
    }
    .pillar-block,
    .scenario-panel.active {
        padding: 18px 16px;
        gap: 18px;
    }
    .pillar-ui-frame {
        padding: 14px;
    }
    .scenario-tabs {
        grid-template-columns: 1fr 1fr;
        gap: 6px;
    }
    .scenario-tab-btn {
        padding: 9px 10px;
        font-size: 0.78rem;
    }

    /* Pricing Mobile */
    .pricing-toggle-wrap {
        border-radius: var(--rounded-lg);
        width: 100%;
    }
    .pricing-tab {
        flex: 1;
        text-align: center;
        padding: 8px 10px;
        font-size: 0.76rem;
        border-radius: var(--rounded-md);
    }
    .pricing-card {
        padding: 20px 18px;
    }

    /* CTA & Footer Mobile */
    .cta-banner {
        padding: 28px 16px;
    }
    .cta-banner .btn {
        width: 100%;
    }
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 24px 16px;
    }
}

@media (max-width: 420px) {
    .stat-3col {
        grid-template-columns: 1fr;
    }
    .footer-grid {
        grid-template-columns: 1fr;
    }
}