/* ============================================
   CSILLA AI AKADÉMIA — STYLES
   Vitality Gym arculat
   ============================================ */

/* ---------- Design Tokens ---------- */
:root {
  /* Brand colors */
  --vg-blue: #2563eb;
  --vg-blue-light: #3b82f6;
  --vg-red: #dc2626;
  --vg-red-light: #ef4444;
  --vg-gold: #f59e0b;
  --vg-gold-dark: #c47d00;
  --vg-gold-light: #fbbf24;

  /* Backgrounds */
  --vg-bg-black: #000000;
  --vg-bg-900: #0a0a0a;
  --vg-bg-800: #111827;
  --vg-bg-card: rgba(255, 255, 255, 0.05);
  --vg-bg-card-hover: rgba(255, 255, 255, 0.08);
  --vg-bg-prompt: #0a0a0a;

  /* Text */
  --vg-text: #ffffff;
  --vg-text-normal: #e5e7eb;
  --vg-text-muted: #9ca3af;
  --vg-text-subtle: #6b7280;

  /* Borders */
  --vg-border: rgba(255, 255, 255, 0.1);
  --vg-border-strong: rgba(255, 255, 255, 0.2);

  /* Fonts */
  --font-display: 'Orbitron', sans-serif;
  --font-heading: 'Oxanium', sans-serif;
  --font-body: 'Outfit', sans-serif;
  --font-mono: 'JetBrains Mono', 'Menlo', monospace;

  /* Spacing */
  --s-1: 0.25rem;
  --s-2: 0.5rem;
  --s-3: 0.75rem;
  --s-4: 1rem;
  --s-5: 1.25rem;
  --s-6: 1.5rem;
  --s-8: 2rem;
  --s-10: 2.5rem;
  --s-12: 3rem;
  --s-16: 4rem;

  /* Radius */
  --r-sm: 4px;
  --r-md: 8px;
  --r-lg: 12px;
  --r-xl: 16px;

  /* Transitions */
  --t-fast: 150ms ease-out;
  --t-base: 250ms ease-out;
  --t-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Layout */
  --max-content: 820px;
  --nav-height: 112px;
  --nav-height-compact: 72px;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: var(--nav-height);
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--vg-text-normal);
  background: var(--vg-bg-black);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* Hide visible scrollbars everywhere — keep scroll functionality */
html, body, .modal-card, .prompt-body, .lesson-body {
  scrollbar-width: none;        /* Firefox */
  -ms-overflow-style: none;     /* IE / legacy Edge */
}
html::-webkit-scrollbar,
body::-webkit-scrollbar,
.modal-card::-webkit-scrollbar,
.prompt-body::-webkit-scrollbar,
.lesson-body::-webkit-scrollbar {
  width: 0;
  height: 0;
  display: none;                /* Chrome, Safari, modern Edge */
}

/* Side stripes — Vitality mandatory element */
body::before,
body::after {
  content: '';
  position: fixed;
  top: 0;
  width: 10px;
  height: 100vh;
  z-index: 9999;
  pointer-events: none;
}
body::before { left: 0; background: var(--vg-blue); }
body::after  { right: 0; background: var(--vg-red); }

img { max-width: 100%; height: auto; display: block; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }
h1, h2, h3, h4, h5, h6 { font-family: var(--font-heading); color: var(--vg-text); line-height: 1.25; }
a { color: var(--vg-gold); text-decoration: none; }
a:hover { text-decoration: underline; }

code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: rgba(245, 158, 11, 0.1);
  color: var(--vg-gold-light);
  padding: 2px 6px;
  border-radius: var(--r-sm);
}

/* ---------- Header ---------- */
.site-header {
  padding: var(--s-10) var(--s-6) var(--s-8);
  max-width: var(--max-content);
  margin: 0 auto;
  text-align: center;
}

.brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--s-4);
  margin-bottom: var(--s-6);
  flex-wrap: wrap;
}

.brand-logo {
  width: 64px;
  height: 64px;
  object-fit: contain;
}

.brand-text {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  line-height: 1;
}

.brand-wordmark {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.5rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.brand-wordmark sup { font-size: 0.55em; vertical-align: super; }

.vg-blue { color: var(--vg-blue); }
.vg-red { color: var(--vg-red); }
.vg-gold { color: var(--vg-gold); }

.brand-sub {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.7rem;
  letter-spacing: 0.3em;
  color: var(--vg-gold);
  margin-top: 4px;
}

.site-title {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  color: var(--vg-text);
  margin-bottom: var(--s-3);
  letter-spacing: -0.02em;
}

.site-tagline {
  font-size: clamp(1rem, 2vw, 1.125rem);
  color: var(--vg-text-muted);
  font-weight: 400;
  max-width: 560px;
  margin: 0 auto var(--s-8);
}

.tricolor-bar {
  height: 3px;
  max-width: 400px;
  margin: 0 auto;
  background: linear-gradient(90deg, var(--vg-blue), var(--vg-gold), var(--vg-red));
  border-radius: 2px;
}

/* ---------- Sticky Phase Navigation ---------- */
.phase-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--vg-border);
  padding: var(--s-4) var(--s-6);
  transition: padding var(--t-base);
}

.phase-nav.compact { padding: var(--s-2) var(--s-6); }

.phase-nav-inner {
  max-width: var(--max-content);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--s-3);
}

.phase-dots {
  display: flex;
  justify-content: center;
  gap: var(--s-3);
  list-style: none;
}

.phase-dot {
  position: relative;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 2px solid var(--vg-border-strong);
  background: transparent;
  cursor: pointer;
  transition: all var(--t-base);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--vg-text-muted);
}

.phase-nav.compact .phase-dot {
  width: 24px;
  height: 24px;
  font-size: 0.625rem;
}

.phase-dot:hover {
  border-color: var(--vg-gold);
  color: var(--vg-gold);
  transform: scale(1.08);
}

.phase-dot.active {
  border-color: var(--vg-gold);
  color: var(--vg-gold);
  animation: dot-pulse 2s infinite;
}

.phase-dot.completed {
  background: var(--vg-gold);
  border-color: var(--vg-gold);
  color: #000;
}

.phase-dot.completed::after {
  content: '✓';
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  color: #000;
  font-weight: 900;
}

.phase-dot.completed span { display: none; }

@keyframes dot-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(245, 158, 11, 0.5); }
  50%      { box-shadow: 0 0 0 8px rgba(245, 158, 11, 0); }
}

.phase-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.875rem;
  gap: var(--s-4);
  flex-wrap: wrap;
}

.phase-meta-name {
  font-family: var(--font-heading);
  font-weight: 700;
  color: var(--vg-text);
}

.phase-meta-progress {
  color: var(--vg-gold);
  font-weight: 600;
}

.phase-nav.compact .phase-meta { display: none; }

.phase-progress-track {
  height: 3px;
  background: var(--vg-border);
  border-radius: 2px;
  overflow: hidden;
}

.phase-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--vg-gold), var(--vg-gold-light));
  width: 0;
  transition: width var(--t-slow);
  box-shadow: 0 0 10px rgba(245, 158, 11, 0.6);
}

/* ---------- Main Content ---------- */
.content {
  max-width: var(--max-content);
  margin: 0 auto;
  padding: var(--s-10) var(--s-6) var(--s-16);
}

/* ---------- Phase Section ---------- */
.phase {
  margin-bottom: var(--s-16);
  scroll-margin-top: calc(var(--nav-height) + 20px);
}

.phase-header {
  margin-bottom: var(--s-8);
  text-align: center;
}

.phase-number {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 900;
  letter-spacing: 0.2em;
  color: var(--vg-gold);
  text-transform: uppercase;
  margin-bottom: var(--s-2);
}

.phase-title {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 800;
  margin-bottom: var(--s-2);
}

.phase-subtitle {
  font-size: 0.9rem;
  color: var(--vg-text-muted);
  margin-bottom: var(--s-5);
}

.phase-divider {
  height: 3px;
  max-width: 200px;
  margin: 0 auto;
  background: linear-gradient(90deg, var(--vg-blue), var(--vg-gold), var(--vg-red));
  border-radius: 2px;
}

/* ---------- Lesson Card ---------- */
.lessons {
  display: flex;
  flex-direction: column;
  gap: var(--s-4);
}

.lesson {
  background: var(--vg-bg-card);
  border: 1px solid var(--vg-border);
  border-radius: var(--r-lg);
  overflow: hidden;
  transition: all var(--t-base);
}

.lesson:hover {
  border-color: var(--vg-border-strong);
  background: var(--vg-bg-card-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.lesson.completed {
  border-color: rgba(245, 158, 11, 0.4);
}

.lesson.completed:hover {
  box-shadow: 0 8px 24px rgba(245, 158, 11, 0.15);
}

.lesson-header {
  display: flex;
  align-items: center;
  gap: var(--s-4);
  padding: var(--s-5) var(--s-6);
  cursor: pointer;
  user-select: none;
  width: 100%;
  text-align: left;
}

.lesson-header:focus-visible {
  outline: 2px solid var(--vg-gold);
  outline-offset: -2px;
}

/* Custom Checkbox */
.lesson-checkbox {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 2px solid var(--vg-border-strong);
  background: transparent;
  position: relative;
  transition: all var(--t-base);
  display: flex;
  align-items: center;
  justify-content: center;
}

.lesson-checkbox:hover {
  border-color: var(--vg-gold);
  transform: scale(1.08);
}

.lesson-checkbox svg {
  width: 18px;
  height: 18px;
  opacity: 0;
  transform: scale(0.5);
  transition: all var(--t-base) 100ms;
}

.lesson.completed .lesson-checkbox {
  background: var(--vg-gold);
  border-color: var(--vg-gold);
  box-shadow: 0 0 16px rgba(245, 158, 11, 0.4);
}

.lesson.completed .lesson-checkbox svg {
  opacity: 1;
  transform: scale(1);
}

.lesson-checkbox.just-checked {
  animation: check-bounce 0.5s ease;
}

@keyframes check-bounce {
  0%   { transform: scale(1); }
  40%  { transform: scale(1.3); }
  70%  { transform: scale(0.95); }
  100% { transform: scale(1); }
}

/* Lesson meta */
.lesson-meta {
  flex-grow: 1;
  min-width: 0;
}

.lesson-title-row {
  display: flex;
  align-items: baseline;
  gap: var(--s-3);
  margin-bottom: var(--s-1);
  flex-wrap: wrap;
}

.lesson-number {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--vg-gold);
  letter-spacing: 0.1em;
}

.lesson-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--vg-text);
  line-height: 1.3;
}

.lesson-tagline {
  font-size: 0.875rem;
  color: var(--vg-text-muted);
  margin-bottom: var(--s-2);
}

.lesson-badges {
  display: flex;
  gap: var(--s-2);
  flex-wrap: wrap;
}

.badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 9999px;
  background: rgba(255, 255, 255, 0.06);
  color: var(--vg-text-muted);
  border: 1px solid var(--vg-border);
}

.badge-difficulty-easy { color: #22c55e; border-color: rgba(34, 197, 94, 0.3); }
.badge-difficulty-medium { color: var(--vg-gold); border-color: rgba(245, 158, 11, 0.3); }
.badge-difficulty-hard { color: var(--vg-red-light); border-color: rgba(220, 38, 38, 0.3); }

.lesson-arrow {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--vg-text-muted);
  font-size: 1.25rem;
  transition: transform var(--t-base);
}

.lesson.expanded .lesson-arrow {
  transform: rotate(180deg);
  color: var(--vg-gold);
}

/* Lesson Body (accordion content) */
.lesson-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--t-slow);
}

.lesson.expanded .lesson-body {
  max-height: 3000px;
}

.lesson-body-inner {
  padding: 0 var(--s-6) var(--s-6);
  border-top: 1px solid var(--vg-border);
  padding-top: var(--s-5);
}

.block {
  margin-bottom: var(--s-5);
  padding-left: var(--s-4);
  border-left: 3px solid var(--vg-border-strong);
}

.block-what   { border-left-color: var(--vg-blue); }
.block-how    { border-left-color: var(--vg-red); }
.block-why    { border-left-color: var(--vg-gold); }
.block-example { border-left-color: #ffffff; }

.block-label {
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: var(--s-2);
  display: flex;
  align-items: center;
  gap: 6px;
}

.block-what .block-label   { color: var(--vg-blue-light); }
.block-how .block-label    { color: var(--vg-red-light); }
.block-why .block-label    { color: var(--vg-gold); }
.block-example .block-label { color: var(--vg-text); }

.block-content {
  color: var(--vg-text-normal);
  font-size: 0.98rem;
  line-height: 1.65;
}

.block-content strong { color: var(--vg-text); }

/* Prompt block */
.prompt-block {
  margin-top: var(--s-6);
  border-radius: var(--r-md);
  background: var(--vg-bg-prompt);
  border: 1px solid var(--vg-border);
  border-left: 4px solid var(--vg-gold);
  overflow: hidden;
}

.prompt-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--s-3) var(--s-4);
  background: rgba(245, 158, 11, 0.08);
  border-bottom: 1px solid var(--vg-border);
}

.prompt-header-label {
  font-family: var(--font-heading);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--vg-gold);
  text-transform: uppercase;
}

.prompt-copy {
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--vg-gold);
  padding: 6px 12px;
  border: 1px solid rgba(245, 158, 11, 0.4);
  border-radius: var(--r-sm);
  transition: all var(--t-fast);
  white-space: nowrap;
}

.prompt-copy:hover {
  background: var(--vg-gold);
  color: #000;
  box-shadow: 0 0 16px rgba(245, 158, 11, 0.4);
}

.prompt-copy.copied {
  background: #22c55e;
  color: #000;
  border-color: #22c55e;
}

.prompt-body {
  padding: var(--s-4);
  overflow-x: hidden;
  min-width: 0;
}

.prompt-body pre,
.prompt-body code,
.prompt-box pre,
.prompt-box code {
  margin: 0;
  padding: 0;
  background: transparent;
  border-radius: 0;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--vg-text-normal);
  white-space: pre-wrap;
  word-break: break-word;
  overflow-wrap: anywhere;
  max-width: 100%;
  display: block;
}

/* Modal stuck-modal prompt-box (different markup than lesson .prompt-block) */
.prompt-box {
  position: relative;
  background: var(--vg-bg-prompt);
  border: 1px solid var(--vg-border);
  border-left: 4px solid var(--vg-gold);
  border-radius: var(--r-md);
  padding: var(--s-4);
  margin-top: var(--s-2);
  overflow: hidden;
}

.prompt-box pre {
  font-size: 0.85rem;
}

.prompt-box .prompt-copy {
  margin-top: var(--s-3);
  display: inline-block;
}

.prompt-none {
  color: var(--vg-text-subtle);
  font-style: italic;
  padding: var(--s-3);
  text-align: center;
}

/* Lesson footer */
.lesson-footer {
  display: flex;
  justify-content: flex-end;
  padding-top: var(--s-4);
  border-top: 1px solid var(--vg-border);
  margin-top: var(--s-5);
}

.lesson-done-btn {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.875rem;
  padding: var(--s-3) var(--s-5);
  background: var(--vg-gold);
  color: #000;
  border-radius: var(--r-md);
  transition: all var(--t-fast);
}

.lesson-done-btn:hover {
  background: var(--vg-gold-light);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(245, 158, 11, 0.5);
}

.lesson.completed .lesson-done-btn {
  background: transparent;
  color: var(--vg-text-muted);
  border: 1px solid var(--vg-border-strong);
}

/* ---------- Footer ---------- */
.site-footer {
  max-width: var(--max-content);
  margin: 0 auto;
  padding: var(--s-8) var(--s-6) var(--s-10);
  text-align: center;
  border-top: 1px solid var(--vg-border);
}

.footer-actions {
  display: flex;
  justify-content: center;
  gap: var(--s-3);
  margin-bottom: var(--s-5);
  flex-wrap: wrap;
}

.footer-btn {
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 600;
  padding: var(--s-2) var(--s-4);
  color: var(--vg-text-muted);
  border: 1px solid var(--vg-border);
  border-radius: var(--r-md);
  transition: all var(--t-fast);
}

.footer-btn:hover {
  color: var(--vg-gold);
  border-color: var(--vg-gold);
}

.footer-copy {
  font-size: 0.8rem;
  color: var(--vg-text-subtle);
}

/* ---------- FAB ---------- */
.fab-stuck {
  position: fixed;
  bottom: var(--s-6);
  right: var(--s-8);
  z-index: 90;
  display: flex;
  align-items: center;
  gap: var(--s-2);
  padding: var(--s-3) var(--s-5);
  background: linear-gradient(90deg, var(--vg-gold), var(--vg-gold-dark));
  color: #000;
  border-radius: 9999px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.875rem;
  box-shadow: 0 4px 20px rgba(245, 158, 11, 0.5);
  transition: all var(--t-base);
  animation: fab-pulse 3s infinite;
}

.fab-stuck:hover {
  transform: translateY(-3px) scale(1.05);
  box-shadow: 0 8px 28px rgba(245, 158, 11, 0.7);
  animation-play-state: paused;
}

.fab-icon { font-size: 1.2rem; }

@keyframes fab-pulse {
  0%, 100% { box-shadow: 0 4px 20px rgba(245, 158, 11, 0.4); }
  50%      { box-shadow: 0 4px 28px rgba(245, 158, 11, 0.8); }
}

/* ---------- Modals ---------- */
.modal {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--s-6);
}

.modal[hidden] { display: none; }

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  animation: fade-in 200ms ease;
}

.modal-card {
  position: relative;
  max-width: 640px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  background: var(--vg-bg-900);
  border: 1px solid var(--vg-border-strong);
  border-radius: var(--r-xl);
  padding: var(--s-8) var(--s-6);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.8), 0 0 0 1px rgba(245, 158, 11, 0.2);
  animation: modal-pop 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes fade-in {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes modal-pop {
  from { opacity: 0; transform: scale(0.92) translateY(20px); }
  to   { opacity: 1; transform: scale(1) translateY(0); }
}

.modal-close {
  position: absolute;
  top: var(--s-4);
  right: var(--s-4);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.06);
  color: var(--vg-text-muted);
  font-size: 1.5rem;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--t-fast);
}

.modal-close:hover {
  background: var(--vg-gold);
  color: #000;
}

.modal-title {
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: var(--s-3);
  padding-right: var(--s-10);
}

.modal-lead {
  color: var(--vg-text-muted);
  margin-bottom: var(--s-6);
}

.stuck-option {
  margin-bottom: var(--s-5);
  padding-bottom: var(--s-5);
  border-bottom: 1px solid var(--vg-border);
}
.stuck-option:last-child { border-bottom: none; }

.stuck-option h3 {
  font-size: 1rem;
  margin-bottom: var(--s-3);
  color: var(--vg-gold);
}

.stuck-option .prompt-block {
  margin-top: var(--s-2);
}

.stuck-howto {
  font-size: 0.875rem;
  color: var(--vg-text-normal);
  background: var(--vg-bg-card);
  border-left: 3px solid var(--vg-blue);
  padding: var(--s-3) var(--s-4);
  border-radius: var(--r-sm);
  margin-bottom: var(--s-3);
}

/* Welcome Modal */
.welcome-card {
  text-align: center;
  padding: var(--s-10) var(--s-8) var(--s-8);
}

.welcome-emoji {
  font-size: 4rem;
  margin-bottom: var(--s-4);
  animation: wave 1s ease infinite alternate;
}

@keyframes wave {
  from { transform: rotate(-10deg); }
  to   { transform: rotate(10deg); }
}

.welcome-card h2 {
  font-size: 2rem;
  margin-bottom: var(--s-4);
}

.welcome-lead {
  font-size: 1.05rem;
  color: var(--vg-text-normal);
  margin-bottom: var(--s-6);
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}

.welcome-stats {
  display: flex;
  justify-content: center;
  gap: var(--s-8);
  margin-bottom: var(--s-6);
}

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

.stat-number {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 900;
  color: var(--vg-gold);
}

.stat-label {
  font-size: 0.8rem;
  color: var(--vg-text-muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.welcome-instructions {
  font-size: 0.9rem;
  color: var(--vg-text-muted);
  margin-bottom: var(--s-6);
}

/* CTA Button */
.cta-button {
  display: inline-block;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1rem;
  padding: var(--s-4) var(--s-8);
  background: linear-gradient(90deg, var(--vg-gold), var(--vg-gold-dark));
  color: #000;
  border-radius: var(--r-md);
  transition: all var(--t-base);
  box-shadow: 0 4px 20px rgba(245, 158, 11, 0.4);
  letter-spacing: 0.05em;
}

.cta-button:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 28px rgba(245, 158, 11, 0.7);
}

/* ---------- Phase Complete Overlay ---------- */
.phase-complete-overlay {
  position: fixed;
  inset: 0;
  z-index: 300;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.9);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  animation: fade-in 400ms ease;
}

.phase-complete-overlay[hidden] { display: none; }

.phase-complete-content {
  text-align: center;
  padding: var(--s-8);
  animation: modal-pop 500ms cubic-bezier(0.4, 0, 0.2, 1);
}

.phase-complete-checkmark {
  margin-bottom: var(--s-6);
  display: flex;
  justify-content: center;
  animation: check-zoom 600ms cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes check-zoom {
  from { transform: scale(0) rotate(-45deg); opacity: 0; }
  to   { transform: scale(1) rotate(0); opacity: 1; }
}

.phase-complete-title {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 900;
  color: var(--vg-text);
  margin-bottom: var(--s-3);
}

.phase-complete-sub {
  font-size: 1.125rem;
  color: var(--vg-text-muted);
  margin-bottom: var(--s-8);
  max-width: 480px;
}

/* ---------- Toast ---------- */
.toast-container {
  position: fixed;
  bottom: var(--s-16);
  left: 50%;
  transform: translateX(-50%);
  z-index: 400;
  display: flex;
  flex-direction: column;
  gap: var(--s-2);
  pointer-events: none;
}

.toast {
  padding: var(--s-3) var(--s-5);
  background: var(--vg-bg-800);
  color: var(--vg-text);
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--r-md);
  border-left: 3px solid var(--vg-gold);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.6);
  animation: toast-in 300ms ease;
  white-space: nowrap;
}

.toast.fade-out {
  animation: toast-out 300ms ease forwards;
}

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

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

/* ---------- Confetti ---------- */
.confetti-layer {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 500;
  overflow: hidden;
}

.confetti-particle {
  position: absolute;
  width: 10px;
  height: 10px;
  border-radius: 2px;
  pointer-events: none;
  will-change: transform, opacity;
}

@keyframes confetti-fall {
  0% {
    transform: translate(0, 0) rotate(0deg);
    opacity: 1;
  }
  100% {
    transform: translate(var(--x), var(--y)) rotate(var(--r));
    opacity: 0;
  }
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  body::before, body::after { width: 6px; }

  .site-header { padding: var(--s-6) var(--s-4) var(--s-5); }
  .content { padding: var(--s-6) var(--s-4) var(--s-12); }

  .phase-nav { padding: var(--s-3) var(--s-4); }
  .phase-dots { gap: var(--s-2); }
  .phase-dot { width: 28px; height: 28px; font-size: 0.65rem; }

  .lesson-header { padding: var(--s-4); gap: var(--s-3); }
  .lesson-checkbox { width: 28px; height: 28px; }
  .lesson-title { font-size: 1rem; }

  .lesson-body-inner { padding: 0 var(--s-4) var(--s-4); padding-top: var(--s-4); }

  .fab-stuck {
    right: var(--s-4);
    bottom: var(--s-4);
    padding: var(--s-3);
  }
  .fab-label { display: none; }

  /* Modal — fully responsive on mobile */
  .modal { padding: var(--s-3); align-items: flex-start; }
  .modal-card {
    max-height: calc(100dvh - var(--s-6));
    max-width: 100%;
    padding: var(--s-6) var(--s-4);
    border-radius: var(--r-md);
    -webkit-overflow-scrolling: touch;
  }
  .modal-title { font-size: 1.2rem; padding-right: var(--s-10); line-height: 1.3; }
  .modal-lead { font-size: 0.9rem; margin-bottom: var(--s-5); }
  .modal-close {
    width: 44px;
    height: 44px;
    top: var(--s-2);
    right: var(--s-2);
  }

  /* SOS modal: prompt blocks must wrap, never overflow */
  .modal .stuck-option { margin-bottom: var(--s-4); padding-bottom: var(--s-4); }
  .modal .stuck-option h3 { font-size: 0.95rem; line-height: 1.35; }
  .modal .stuck-howto { font-size: 0.82rem; padding: var(--s-3); }
  .modal .stuck-howto code { font-size: 0.75rem; word-break: break-word; }
  .modal .prompt-block { margin-top: var(--s-2); }
  .modal .prompt-header { padding: var(--s-2) var(--s-3); flex-wrap: wrap; gap: var(--s-2); }
  .modal .prompt-header-label { font-size: 0.65rem; }
  .modal .prompt-copy { font-size: 0.7rem; padding: 5px 10px; }
  .modal .prompt-body { padding: var(--s-3); }
  .modal .prompt-body pre,
  .modal .prompt-body code {
    font-size: 0.78rem;
    line-height: 1.55;
  }

  .welcome-stats { gap: var(--s-4); }
  .stat-number { font-size: 1.5rem; }
  .welcome-card { padding: var(--s-8) var(--s-4) var(--s-6); }
  .welcome-card h2 { font-size: 1.6rem; }
  .welcome-lead { font-size: 0.95rem; }
  .welcome-emoji { font-size: 3rem; }
}

@media (max-width: 480px) {
  .brand-logo { width: 48px; height: 48px; }
  .brand-wordmark { font-size: 1.125rem; }
  .phase-dot { width: 24px; height: 24px; font-size: 0.55rem; }
  .phase-meta { font-size: 0.75rem; }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  html { scroll-behavior: auto; }
  .confetti-layer { display: none; }
}