/* ==========================================================================
   TERRICON VALLEY // 2026 - CALM PRESENTATION SYSTEM
   Designed for Gennadiy Zakharov Presentation Landing Page
   Theme: Minimalist Industrial Slate & Amber-Copper
   ========================================================================== */

/* --- CSS Variables & Design Tokens --- */
:root {
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-display: 'Montserrat', system-ui, -apple-system, sans-serif;
  --font-mono: 'Fira Code', monospace;

  /* Colors */
  --bg-color: #0c0d10;
  --bg-card: #13161c;
  --bg-panel: #181b22;
  
  --text-primary: #ffffff;
  --text-secondary: #d1d5db;
  --text-muted: #9ca3af;
  --text-dark: #4b5563;
  
  /* Brand Accents */
  --accent-orange: #ff7a00;
  --accent-orange-hover: #e66b00;
  --accent-green: #10b981;
  --accent-red: #ef4444;
  
  --border-light: rgba(255, 255, 255, 0.06);
  --border-focus: rgba(255, 122, 0, 0.3);
  
  --header-height: 70px;
  --sidebar-width: 280px;
  
  --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.6;
  overflow: hidden; /* Lock main viewport, scroller is custom container */
}

/* Scrollbars */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: rgba(0, 0, 0, 0.1);
}
::-webkit-scrollbar-thumb {
  background: var(--text-dark);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--accent-orange);
}

/* --- Typography & Global Utilities --- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.25;
}

strong {
  color: var(--text-primary);
  font-weight: 600;
}

.accent-orange {
  color: var(--accent-orange);
}

.text-orange {
  color: var(--accent-orange);
}

.text-red {
  color: var(--accent-red) !important;
}

.fira-code {
  font-family: var(--font-mono);
}

/* --- App Layout Construction --- */
.app-container {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  grid-template-rows: var(--header-height) 1fr;
  grid-template-areas: 
    "header header"
    "sidebar scroller";
  height: 100vh;
  width: 100vw;
  position: relative;
  background-color: var(--bg-color);
}

/* --- Top Sticky Header --- */
.app-header {
  grid-area: header;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 40px;
  background-color: #111317;
  border-bottom: 1px solid var(--border-light);
  position: relative;
  z-index: 100;
}

.header-left .logo {
  text-decoration: none;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.1rem;
  letter-spacing: 1.5px;
  display: flex;
  align-items: center;
  gap: 8px;
}

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

.logo-sep {
  color: var(--text-dark);
  font-weight: 300;
}

.logo-title {
  color: var(--text-primary);
  font-size: 0.95rem;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 20px;
}

.vibe-coding-pill {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--accent-orange);
  background-color: rgba(255, 122, 0, 0.08);
  border: 1px solid rgba(255, 122, 0, 0.15);
  padding: 6px 14px;
  border-radius: 20px;
  letter-spacing: 0.5px;
}

.btn-pdf-download {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 10px 18px;
  border-radius: 6px;
  background-color: var(--accent-orange);
  color: #000000;
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.btn-pdf-download:hover {
  background-color: var(--accent-orange-hover);
  transform: translateY(-1px);
}

.icon-dl {
  width: 16px;
  height: 16px;
}

/* Scroll progress bar */
.scroll-progress-line {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background-color: var(--accent-orange);
  transition: width 0.1s ease-out;
}

/* --- Sidebar Navigation (Table of Contents) --- */
.app-sidebar {
  grid-area: sidebar;
  background-color: #101216;
  border-right: 1px solid var(--border-light);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 40px 30px;
  z-index: 50;
}

.sidebar-title {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 2px;
  margin-bottom: 24px;
  padding-left: 10px;
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  padding: 12px 14px;
  border-radius: 6px;
  color: var(--text-muted);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.8rem;
  transition: all var(--transition-fast);
  border-left: 2px solid transparent;
}

.nav-item:hover {
  color: var(--text-primary);
  background-color: rgba(255, 255, 255, 0.02);
}

.nav-item.active {
  color: var(--text-primary);
  background-color: rgba(255, 122, 0, 0.05);
  border-left-color: var(--accent-orange);
}

.nav-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--text-dark);
  transition: background-color var(--transition-fast);
}

.nav-item.active .nav-dot {
  background-color: var(--accent-orange);
  box-shadow: 0 0 8px var(--accent-orange);
}

.sidebar-footer {
  border-top: 1px solid var(--border-light);
  padding-top: 24px;
}

.speaker-lbl, .event-lbl {
  font-size: 0.65rem;
  color: var(--text-dark);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.speaker-val {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-secondary);
  margin: 3px 0 6px 0;
}

/* --- Main Slides Container --- */
.slides-scroller {
  grid-area: scroller;
  overflow-y: scroll;
  scroll-behavior: smooth;
  scroll-snap-type: y proximity;
  height: calc(100vh - var(--header-height));
  width: 100%;
}

.slides-list {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 80px 40px;
  gap: 120px;
}

/* --- Presentation Slide Card --- */
.slide-card {
  scroll-snap-align: center;
  scroll-margin-top: 40px;
  width: 100%;
  max-width: 900px;
  min-height: 520px;
  background-color: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: 12px;
  padding: 48px;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.25);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: border-color var(--transition-normal);
}

.slide-card:hover {
  border-color: rgba(255, 122, 0, 0.15);
}

.slide-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  padding-bottom: 16px;
  margin-bottom: 28px;
}

.slide-num {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent-orange);
}

.slide-cat {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 2px;
}

.slide-body {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.slide-title {
  font-family: var(--font-display);
  font-size: 2.1rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 24px;
  line-height: 1.25;
}

/* Base Body Text / Lists inside cards */
.slide-body p {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.slide-body ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.slide-body li {
  position: relative;
  padding-left: 24px;
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.slide-body li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--accent-orange);
  font-weight: 700;
}

/* --- Layout 1: Title Slide --- */
.title-slide-layout {
  justify-content: space-between;
  height: 100%;
}

.title-slide-main {
  margin: auto 0;
}

.title-slide-main .main-title {
  font-size: 3.4rem;
  line-height: 1.15;
  font-weight: 800;
}

.title-slide-main .main-subtitle {
  font-size: 1.35rem;
  color: var(--text-muted);
  margin-top: 15px;
}

.title-details {
  display: flex;
  gap: 12px;
  margin-top: 32px;
}

.detail-tag {
  background-color: rgba(255, 122, 0, 0.08);
  border: 1px solid rgba(255, 122, 0, 0.15);
  color: var(--accent-orange);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 6px 16px;
  border-radius: 30px;
}

.title-slide-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--border-light);
  padding-top: 24px;
  margin-top: 40px;
}

.speaker-name-large {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
}

.event-name {
  font-size: 0.95rem;
  color: var(--text-muted);
}

/* --- Layout 2: Speaker Intro --- */
.speaker-intro-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 40px;
  align-items: start;
}

.speaker-tags-panel {
  background-color: var(--bg-panel);
  border: 1px solid var(--border-light);
  border-radius: 8px;
  padding: 24px;
}

.tags-title {
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 1px;
  margin-bottom: 16px;
}

.tags-container {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.solid-tag {
  font-size: 0.78rem;
  color: var(--text-secondary);
  background-color: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-light);
  padding: 6px 12px;
  border-radius: 4px;
}

.solid-tag.accent {
  background-color: rgba(255, 122, 0, 0.08);
  border: 1px solid rgba(255, 122, 0, 0.2);
  color: var(--accent-orange);
  font-weight: 600;
}

.clean-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--accent-orange);
  text-decoration: none;
  font-weight: 600;
  border-bottom: 1px dashed rgba(255, 122, 0, 0.3);
  transition: all var(--transition-fast);
}

.clean-link:hover {
  border-bottom-color: var(--accent-orange);
  color: var(--text-primary);
}

.link-icon {
  width: 14px;
  height: 14px;
}

/* --- Layout 3: Metrics Block --- */
.slide-lead {
  font-size: 1.25rem;
  color: var(--accent-orange);
  font-weight: 500;
  margin-bottom: 24px;
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 10px;
}

.metric-box {
  background-color: var(--bg-panel);
  border: 1px solid var(--border-light);
  border-radius: 8px;
  padding: 24px 16px;
  text-align: center;
  transition: all var(--transition-normal);
}

.metric-box:hover {
  border-color: rgba(255, 122, 0, 0.2);
  transform: translateY(-2px);
}

.metric-val {
  font-family: var(--font-display);
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.1;
}

.metric-val.text-accent {
  color: var(--accent-orange);
}

.metric-lbl {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 8px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* --- Layout 4: Highlighting Info Card --- */
.info-highlight-card {
  background-color: var(--bg-panel);
  border: 1px solid var(--border-light);
  border-radius: 8px;
  padding: 32px;
}

.info-highlight-card .divider {
  height: 1px;
  background-color: var(--border-light);
  margin: 20px 0;
}

.pay-as-you-go-highlight {
  display: flex;
  align-items: center;
  gap: 16px;
  line-height: 1.5;
}

.tag-payg {
  font-family: var(--font-display);
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  background-color: var(--accent-orange);
  color: #000000;
  padding: 4px 8px;
  border-radius: 4px;
  letter-spacing: 0.5px;
  flex-shrink: 0;
}

/* --- Layout 5: Role Grid --- */
.role-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 40px;
  align-items: center;
}

.role-header-box {
  background-color: var(--bg-panel);
  border: 1px solid var(--border-light);
  border-radius: 8px;
  padding: 30px;
}

.role-title-tag {
  font-family: var(--font-display);
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 1px;
  margin-bottom: 4px;
}

.role-title-name {
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--accent-orange);
  margin-bottom: 8px;
}

.role-team-size {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

/* --- Layout 6: Center/Quote Content --- */
.center-content-layout {
  text-align: center;
  align-items: center;
  justify-content: center;
  min-height: 340px;
}

.huge-topic-text {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.25;
  margin-bottom: 12px;
}

.tagline-sub {
  font-size: 1.25rem;
  color: var(--text-muted);
  max-width: 680px;
  margin: 0 auto;
}

.tagline-sub.text-orange {
  color: var(--accent-orange);
  font-weight: 600;
}

.simple-quote-box {
  font-size: 1.35rem;
  font-style: italic;
  color: var(--accent-orange);
  background-color: rgba(255, 122, 0, 0.03);
  border-left: 4px solid var(--accent-orange);
  padding: 20px 30px;
  border-radius: 0 8px 8px 0;
  margin-top: 30px;
  text-align: left;
  max-width: 640px;
}

/* --- Layout 7: Pre-requisites List --- */
.pre-req-list-calm {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.pre-req-item-calm {
  background-color: var(--bg-panel);
  border: 1px solid var(--border-light);
  border-radius: 8px;
  padding: 20px;
  display: flex;
  gap: 16px;
  align-items: start;
}

.num-badge-calm {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent-orange);
  background-color: rgba(255, 122, 0, 0.08);
  border: 1px solid rgba(255, 122, 0, 0.15);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.pre-req-item-calm h4 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.pre-req-item-calm p {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.45;
}

/* --- Layout 8: Classic Boxes (What Worked / What Failed) --- */
.classic-content-box {
  background-color: rgba(255, 255, 255, 0.01);
  border-left: 4px solid var(--accent-orange);
  padding: 24px 30px;
  border-radius: 0 8px 8px 0;
  margin-top: 10px;
}

/* Specific Style for Successful Slides (Slide 8-12) via CSS overrides */
#slide-8 .classic-content-box,
#slide-9 .classic-content-box,
#slide-10 .classic-content-box,
#slide-11 .classic-content-box,
#slide-12 .classic-content-box {
  border-left-color: var(--accent-green);
  background-color: rgba(16, 185, 129, 0.015);
}

#slide-8 .slide-body li::before,
#slide-9 .slide-body li::before,
#slide-10 .slide-body li::before,
#slide-11 .slide-body li::before,
#slide-12 .slide-body li::before {
  color: var(--accent-green);
}

.result-highlight-item {
  display: flex;
  align-items: start;
  gap: 12px;
  background-color: rgba(16, 185, 129, 0.05);
  border: 1px solid rgba(16, 185, 129, 0.15);
  padding: 16px 20px;
  border-radius: 6px;
  margin-top: 20px;
}

.result-highlight-item span {
  font-size: 0.95rem;
  line-height: 1.5;
}

.result-badge-green {
  font-family: var(--font-display);
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  background-color: var(--accent-green);
  color: #000000;
  padding: 3px 8px;
  border-radius: 4px;
  letter-spacing: 0.5px;
  flex-shrink: 0;
}

/* Style for Failed Slides (Slide 13-16) */
.classic-content-box.failed-box {
  border-left-color: var(--accent-red);
  background-color: rgba(239, 68, 68, 0.015);
}

.classic-content-box.failed-box li::before {
  color: var(--accent-red);
}

.lesson-bullet, .solution-bullet, .insight-bullet {
  background-color: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-light);
  border-radius: 6px;
  padding: 14px 20px 14px 44px !important;
  margin-top: 15px;
}

.lesson-bullet::before, .solution-bullet::before, .insight-bullet::before {
  content: "💡" !important;
  position: absolute;
  left: 16px;
  top: 14px;
  font-size: 1.1rem;
}

.solution-bullet::before {
  content: "✅" !important;
}

.insight-bullet::before {
  content: "✨" !important;
}

.emphasis-bullet {
  border-left: 2px solid var(--accent-orange);
  background-color: rgba(255, 122, 0, 0.02);
  padding-left: 35px !important;
}

.emphasis-bullet::before {
  content: "👉" !important;
  left: 12px !important;
}

/* --- Layout 9: Trends (Slide 18) --- */
.trends-bullets-calm {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.trend-item-calm {
  background-color: var(--bg-panel);
  border: 1px solid var(--border-light);
  border-radius: 8px;
  padding: 20px 24px;
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 24px;
  align-items: center;
}

.trend-item-calm strong {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--accent-orange);
}

.trend-item-calm span {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* --- Layout 10: Scenarios Grid (Slide 19) --- */
.scenarios-grid-calm {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 10px;
}

.scenario-card-calm {
  background-color: var(--bg-panel);
  border: 1px solid var(--border-light);
  border-radius: 8px;
  padding: 24px;
  text-align: center;
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 110px;
  transition: all var(--transition-normal);
}

.scenario-card-calm:hover {
  border-color: rgba(255, 122, 0, 0.2);
  transform: translateY(-2px);
  color: var(--text-primary);
}

/* Center odd item on bottom row */
.scenarios-grid-calm .scenario-card-calm:nth-child(4) {
  grid-column: 1 / 2;
}

/* --- Layout 11: Tools Directory (Slide 25) --- */
.tools-directory-calm {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.tool-calm-item {
  background-color: var(--bg-panel);
  border: 1px solid var(--border-light);
  border-radius: 8px;
  padding: 20px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 120px;
  transition: border-color var(--transition-normal);
}

.tool-calm-item:hover {
  border-color: rgba(255, 122, 0, 0.15);
}

.tool-calm-item.featured-gemini {
  border-color: rgba(255, 122, 0, 0.3);
  background-color: rgba(255, 122, 0, 0.02);
}

.tool-calm-name {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--accent-orange);
}

.tool-calm-val {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin-top: 8px;
}

.badge-internal-calm {
  font-size: 0.65rem;
  font-weight: 700;
  background-color: var(--accent-orange);
  color: #000000;
  padding: 2px 6px;
  border-radius: 4px;
  text-transform: uppercase;
  margin-left: 8px;
  letter-spacing: 0.5px;
  vertical-align: middle;
}

/* --- Layout 12: Video Resource List (Slide 26) --- */
.videos-list-calm {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.video-item-calm {
  background-color: var(--bg-panel);
  border: 1px solid var(--border-light);
  border-radius: 8px;
  padding: 20px 24px;
  display: flex;
  align-items: center;
  gap: 20px;
  text-decoration: none;
  transition: all var(--transition-normal);
}

.video-item-calm:hover {
  border-color: rgba(255, 122, 0, 0.2);
  transform: translateY(-2px);
}

.vid-icon {
  font-size: 1.3rem;
  color: var(--accent-orange);
  background-color: rgba(255, 122, 0, 0.08);
  border: 1px solid rgba(255, 122, 0, 0.15);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.vid-details h4 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 3px;
}

.vid-url {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-dark);
}

/* --- Layout 13: Contacts Slide --- */
.contacts-slide-layout {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 40px;
  align-items: center;
}

.contacts-left-box {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.contacts-title {
  font-family: var(--font-display);
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 4px;
}

.contacts-speaker-name {
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--accent-orange);
}

.contacts-description {
  color: var(--text-muted);
  font-size: 0.98rem;
  line-height: 1.5;
  margin-bottom: 12px;
}

.contacts-email-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.mail-ic {
  font-size: 1.1rem;
}

.mail-lnk {
  font-family: var(--font-display);
  color: var(--text-primary);
  text-decoration: none;
  font-size: 1.1rem;
  font-weight: 700;
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
  transition: all var(--transition-fast);
}

.mail-lnk:hover {
  color: var(--accent-orange);
  border-bottom-color: var(--accent-orange);
}

.contacts-right-box {
  background-color: var(--bg-panel);
  border: 1px solid var(--border-light);
  border-radius: 8px;
  padding: 30px;
}

.socials-label-calm {
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 1px;
  margin-bottom: 18px;
}

.socials-grid-calm {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.soc-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 12px;
  border-radius: 6px;
  text-decoration: none;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.9rem;
  color: #ffffff;
  transition: transform var(--transition-fast), filter var(--transition-fast);
}

.soc-btn:hover {
  transform: translateY(-1px);
  filter: brightness(1.1);
}

.soc-btn.tg {
  background-color: #0088cc;
}

.soc-btn.ig {
  background: linear-gradient(45deg, #f09433 0%, #e6683c 25%, #dc2743 50%, #cc2366 75%, #bc1888 100%);
}

.soc-btn.fb {
  background-color: #3b5998;
}

.case-card-label-calm {
  font-size: 0.85rem;
  color: var(--text-dark);
  font-weight: 500;
}

/* ==========================================================================
   RESPONSIVE DESIGN SYSTEM (MOBILE COMPATIBILITY)
   ========================================================================== */
@media (max-width: 1024px) {
  /* Collapse Sidebar navigation completely, linear flow on mobile */
  .app-container {
    grid-template-columns: 1fr;
    grid-template-areas: 
      "header"
      "scroller";
    height: auto;
    overflow: visible;
  }
  
  body {
    overflow: visible;
  }
  
  .app-sidebar {
    display: none;
  }
  
  .slides-scroller {
    height: auto;
    overflow-y: visible;
  }
  
  .slides-list {
    padding: 40px 20px;
    gap: 60px;
  }
  
  .slide-card {
    min-height: auto;
    padding: 30px 24px;
  }
  
  .title-slide-main .main-title {
    font-size: 2.2rem;
  }
  
  .speaker-intro-grid,
  .role-grid,
  .contacts-slide-layout {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  
  .metrics-grid,
  .pre-req-list-calm,
  .scenarios-grid-calm,
  .tools-directory-calm {
    grid-template-columns: 1fr;
    gap: 15px;
  }
  
  .trend-item-calm {
    grid-template-columns: 1fr;
    gap: 8px;
  }
  
  .app-header {
    padding: 0 20px;
  }
  
  .logo-title {
    font-size: 0.85rem;
  }
  
  .vibe-coding-pill {
    display: none;
  }
}