/* CentralOps — dashboard-style personal hub */
:root {
  --font-sans: "DM Sans", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;
  --bg-base: #f0f2f5;
  --bg-elevated: #ffffff;
  --bg-grid: rgba(15, 20, 25, 0.04);
  --text: #1a1f26;
  --text-muted: #5c6570;
  --border: rgba(15, 20, 25, 0.08);
  --shadow: 0 1px 2px rgba(15, 20, 25, 0.06), 0 8px 24px rgba(15, 20, 25, 0.06);
  --shadow-hover: 0 4px 12px rgba(15, 20, 25, 0.1), 0 16px 40px rgba(15, 20, 25, 0.08);
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --header-glow: linear-gradient(120deg, #3d9eff 0%, #7c5cff 40%, #00c9a7 100%);
  --btn-ease: cubic-bezier(0.34, 1.56, 0.64, 1);
  --btn-ease-soft: cubic-bezier(0.22, 1, 0.36, 1);
}

body.dark {
  --bg-base: #0f1419;
  --bg-elevated: #171c24;
  --bg-grid: rgba(255, 255, 255, 0.03);
  --text: #e8eaed;
  --text-muted: #9aa3ad;
  --border: rgba(255, 255, 255, 0.08);
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.35), 0 8px 28px rgba(0, 0, 0, 0.35);
  --shadow-hover: 0 8px 24px rgba(0, 0, 0, 0.45);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  section {
    opacity: 1 !important;
    transform: none !important;
  }
  section.visible .button-container > * {
    animation: none !important;
    opacity: 1 !important;
    transform: none !important;
  }
  .dropdown-content {
    transition-duration: 0.01ms !important;
  }
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.55;
  color: var(--text);
  background-color: var(--bg-base);
  background-image:
    radial-gradient(ellipse 120% 80% at 50% -20%, rgba(61, 158, 255, 0.12), transparent 50%),
    linear-gradient(var(--bg-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--bg-grid) 1px, transparent 1px);
  background-size: 100% 100%, 32px 32px, 32px 32px;
  transition: background-color 0.35s ease, color 0.25s ease;
}

/* Theme toggle */
.toggle-btn {
  position: fixed;
  top: 1.25rem;
  right: 1.25rem;
  z-index: 10000;
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: var(--bg-elevated);
  box-shadow: var(--shadow);
  cursor: pointer;
  animation: toggleIn 0.55s cubic-bezier(0.34, 1.56, 0.64, 1) 0.15s both;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.toggle-btn:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-hover);
}

.toggle-btn:focus-visible {
  outline: 2px solid #3d9eff;
  outline-offset: 2px;
}

.toggle-btn img {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: block;
}

/* Hero header */
.site-header {
  position: relative;
  padding: clamp(3rem, 8vw, 5rem) 1.5rem 2.5rem;
  text-align: center;
  border-bottom: 1px solid var(--border);
  background: var(--bg-elevated);
  overflow: hidden;
}

.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 60% at 50% 0%, rgba(61, 158, 255, 0.15), transparent 55%);
  pointer-events: none;
}

.site-header__inner {
  position: relative;
  max-width: 40rem;
  margin: 0 auto;
}

@keyframes headerLineIn {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.site-header__eyebrow {
  margin: 0 0 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
  animation: headerLineIn 0.7s cubic-bezier(0.22, 1, 0.36, 1) backwards;
}

.animated-title {
  margin: 0;
  font-size: clamp(2rem, 5vw, 2.75rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.15;
  background: var(--header-glow);
  background-size: 200% 200%;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: headerLineIn 0.75s cubic-bezier(0.22, 1, 0.36, 1) 0.08s backwards,
    gradientMove 10s ease infinite;
}

@keyframes gradientMove {
  0%,
  100% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
}

.site-header__tagline {
  margin: 1rem 0 0;
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 36ch;
  margin-left: auto;
  margin-right: auto;
  animation: headerLineIn 0.75s cubic-bezier(0.22, 1, 0.36, 1) 0.2s backwards;
}

.page-main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1.25rem 1rem 3rem;
}

/* Sections */
@keyframes sectionIn {
  from {
    opacity: 0;
    transform: translateY(22px) scale(0.992);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes sectionHeadIn {
  from {
    opacity: 0;
    transform: translateX(-8px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes tileIn {
  from {
    opacity: 0;
    transform: translateY(14px) scale(0.97);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes dropdownLinkIn {
  from {
    opacity: 0;
    transform: translateX(-8px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes footerIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes toggleIn {
  from {
    opacity: 0;
    transform: scale(0.85) rotate(-12deg);
  }
  to {
    opacity: 1;
    transform: scale(1) rotate(0deg);
  }
}

section {
  margin-bottom: 1.25rem;
  padding: 1.35rem 1.35rem 1.5rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  opacity: 0;
  transform: translateY(22px) scale(0.992);
  transition: box-shadow 0.25s ease;
}

section.visible {
  opacity: 1;
  transform: translateY(0);
  animation: sectionIn 0.7s cubic-bezier(0.22, 1, 0.36, 1) both;
}

section.visible h2 {
  animation: sectionHeadIn 0.55s cubic-bezier(0.22, 1, 0.36, 1) 0.05s both;
}

/* Staggered link tiles (--stagger set in script.js) */
section.visible .button-container > * {
  animation: tileIn 0.48s cubic-bezier(0.22, 1, 0.36, 1) both;
  animation-delay: calc(var(--stagger, 0) * 38ms);
}

section:hover {
  box-shadow: var(--shadow-hover);
}

section h2 {
  margin: 0 0 1.1rem;
  padding-bottom: 0.65rem;
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--text);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Accent stripes per area */
.Server-Setup {
  border-left: 4px solid #4a9d3f;
}
.Server-Hardening {
  border-left: 4px solid #c94a3d;
}
.Database-Setup {
  border-left: 4px solid #7c5cff;
}
.Error-Problem-Solutions {
  border-left: 4px solid #4d6bff;
}
.DEVOPS {
  border-left: 4px solid #c17a45;
}
.AWS {
  border-left: 4px solid #6b7280;
}

/* Link grid */
.button-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 0.75rem;
  align-items: stretch;
}

@media (min-width: 900px) {
  .button-container {
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  }
}

.dropdown {
  position: relative;
  display: block;
  width: 100%;
  min-height: 88px;
  z-index: 1;
}

/* Open dropdown stacks above plain link tiles (see .button-container > a.btn) */
.dropdown.dropdown--open {
  z-index: 40;
}

/* Plain link tiles stay clickable (above closed neighbours’ empty overlay boxes) */
.button-container > a.btn {
  position: relative;
  z-index: 2;
}

.dropdown > .btn {
  all: unset;
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  min-height: 88px;
  width: 100%;
  padding: 0.75rem 0.65rem;
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.9rem;
  line-height: 1.25;
  cursor: pointer;
  box-sizing: border-box;
  transition: transform 0.32s var(--btn-ease), box-shadow 0.32s ease, filter 0.22s ease;
}

.dropdown > .btn::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(125deg, rgba(255, 255, 255, 0.35) 0%, transparent 45%, transparent 100%);
  opacity: 0;
  transition: opacity 0.35s ease;
  pointer-events: none;
}

.dropdown > .btn:hover::after {
  opacity: 1;
}

/*
 * Popover: avoid display:none so open/close transitions run.
 * When closed, collapse height (max-height: 0) so huge menus (e.g. VPC) don’t
 * leave an invisible layer over other tiles — that was blocking hover/clicks
 * on EC2, IAM, etc. which appear earlier in the grid.
 */
.dropdown-content {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 0.35rem;
  position: absolute;
  z-index: 2000;
  top: calc(100% + 6px);
  left: 0;
  right: 0;
  min-width: min(100%, 280px);
  max-width: min(92vw, 820px);
  /* Collapsed when closed — no invisible hit-box over the page */
  max-height: 0;
  min-height: 0;
  padding: 0;
  margin: 0;
  overflow: hidden;
  border: 0 solid transparent;
  border-radius: var(--radius-md);
  background: var(--bg-elevated);
  box-shadow: none;
  -webkit-overflow-scrolling: touch;
  transform-origin: top center;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(-10px) scale(0.96);
  transition:
    max-height 0.32s var(--btn-ease-soft),
    opacity 0.22s var(--btn-ease-soft),
    transform 0.28s var(--btn-ease),
    visibility 0s linear 0.32s,
    padding 0.28s ease,
    box-shadow 0.25s ease;
}

.dropdown-content.show {
  max-height: min(70vh, 520px);
  padding: 0.5rem;
  overflow-x: hidden;
  overflow-y: auto;
  border-width: 1px;
  border-style: solid;
  border-color: var(--border);
  box-shadow: var(--shadow-hover);
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateY(0) scale(1);
  transition:
    max-height 0.38s var(--btn-ease-soft),
    opacity 0.26s var(--btn-ease-soft),
    transform 0.32s var(--btn-ease),
    visibility 0s,
    padding 0.28s ease,
    border-width 0s,
    box-shadow 0.25s ease;
}

.dropdown-content.show a {
  animation: dropdownLinkIn 0.32s var(--btn-ease-soft) backwards;
}

.dropdown-content.show a:nth-child(1) {
  animation-delay: 0.02s;
}
.dropdown-content.show a:nth-child(2) {
  animation-delay: 0.05s;
}
.dropdown-content.show a:nth-child(3) {
  animation-delay: 0.08s;
}
.dropdown-content.show a:nth-child(4) {
  animation-delay: 0.11s;
}
.dropdown-content.show a:nth-child(5) {
  animation-delay: 0.14s;
}
.dropdown-content.show a:nth-child(6) {
  animation-delay: 0.17s;
}
.dropdown-content.show a:nth-child(7) {
  animation-delay: 0.2s;
}
.dropdown-content.show a:nth-child(8) {
  animation-delay: 0.23s;
}
.dropdown-content.show a:nth-child(9) {
  animation-delay: 0.26s;
}
.dropdown-content.show a:nth-child(10) {
  animation-delay: 0.29s;
}
.dropdown-content.show a:nth-child(n + 11) {
  animation-delay: 0.32s;
}

.dropdown-content a {
  display: block;
  padding: 0.55rem 0.65rem;
  border-radius: var(--radius-sm);
  text-decoration: none;
  color: var(--text);
  font-size: 0.85rem;
  line-height: 1.35;
  transition: background 0.18s ease, transform 0.2s var(--btn-ease-soft), box-shadow 0.2s ease;
}

.dropdown-content a:hover {
  background: var(--bg-base);
  transform: translateX(5px);
  box-shadow: inset 3px 0 0 rgba(61, 158, 255, 0.55);
}

body.dark .dropdown-content a:hover {
  box-shadow: inset 3px 0 0 rgba(96, 165, 250, 0.7);
}

/* Primary tiles */
.btn {
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  min-height: 88px;
  padding: 0.75rem 0.65rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.9rem;
  line-height: 1.25;
  text-decoration: none;
  color: #fff;
  box-shadow: 0 2px 0 rgba(0, 0, 0, 0.12), 0 4px 14px rgba(0, 0, 0, 0.08);
  transition: transform 0.32s var(--btn-ease), box-shadow 0.32s ease, filter 0.22s ease;
}

.btn::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(125deg, rgba(255, 255, 255, 0.38) 0%, transparent 42%, transparent 100%);
  opacity: 0;
  transition: opacity 0.35s ease;
  pointer-events: none;
}

.btn:hover::after {
  opacity: 1;
}

.btn:hover {
  transform: translateY(-6px) scale(1.03);
  box-shadow: 0 14px 32px rgba(0, 0, 0, 0.2), 0 0 0 1px rgba(255, 255, 255, 0.12) inset;
  filter: brightness(1.06) saturate(1.06);
}

.btn:active {
  transform: translateY(-2px) scale(0.98);
  transition-duration: 0.12s;
  filter: brightness(0.96);
}

.dropdown > .btn:hover {
  transform: translateY(-6px) scale(1.03);
  box-shadow: 0 14px 32px rgba(0, 0, 0, 0.2), 0 0 0 1px rgba(255, 255, 255, 0.1) inset;
  filter: brightness(1.06) saturate(1.05);
}

.dropdown > .btn:active {
  transform: translateY(-2px) scale(0.98);
  transition-duration: 0.12s;
}

.btn:focus-visible {
  outline: 2px solid #fff;
  outline-offset: 2px;
}

/* Section color tokens */
.Server-Setup .btn,
.Server-Setup .dropdown > .btn {
  background: linear-gradient(145deg, #5cb84a 0%, #3d8a32 100%);
  color: #fff;
}
.Server-Setup .btn:hover,
.Server-Setup .dropdown > .btn:hover {
  filter: brightness(1.08);
}

.Server-Hardening .btn,
.Server-Hardening .dropdown > .btn {
  background: linear-gradient(145deg, #e06354 0%, #b83d30 100%);
  color: #fff;
}

.Database-Setup .btn,
.Database-Setup .dropdown > .btn {
  background: linear-gradient(145deg, #8b6bff 0%, #6542e0 100%);
  color: #fff;
}

.Error-Problem-Solutions .btn,
.Error-Problem-Solutions .dropdown > .btn {
  background: linear-gradient(145deg, #6b7fff 0%, #4a5de0 100%);
  color: #fff;
}

.DEVOPS .btn,
.DEVOPS .dropdown > .btn {
  background: linear-gradient(145deg, #d4894f 0%, #a86a38 100%);
  color: #fff;
}

.AWS .btn,
.AWS .dropdown > .btn {
  background: linear-gradient(145deg, #6b7280 0%, #4b5563 100%);
  color: #fff;
}

.btn-red {
  background: linear-gradient(145deg, #e06354 0%, #b83d30 100%) !important;
}

body.dark .Server-Setup .btn,
body.dark .Server-Setup .dropdown > .btn {
  background: linear-gradient(145deg, #5aad4e 0%, #3f8c35 100%);
}
body.dark .Database-Setup .btn,
body.dark .Database-Setup .dropdown > .btn {
  background: linear-gradient(145deg, #9b7fff 0%, #6e4fd9 100%);
}
body.dark .Error-Problem-Solutions .btn,
body.dark .Error-Problem-Solutions .dropdown > .btn {
  background: linear-gradient(145deg, #7d8fff 0%, #5568e8 100%);
}
body.dark .DEVOPS .btn,
body.dark .DEVOPS .dropdown > .btn {
  background: linear-gradient(145deg, #e49a5c 0%, #b87a42 100%);
}
body.dark .AWS .btn,
body.dark .AWS .dropdown > .btn {
  background: linear-gradient(145deg, #7a828f 0%, #525a66 100%);
}

body.dark .dropdown-content {
  background: #1c222c;
  border-color: var(--border);
}

body.dark .dropdown-content a:hover {
  background: #252d3a;
}

/* Footer */
.site-footer {
  text-align: center;
  padding: 1.5rem 1rem 2rem;
  font-size: 0.9rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
  background: var(--bg-elevated);
  animation: footerIn 0.65s cubic-bezier(0.22, 1, 0.36, 1) 0.35s both;
}

.site-footer a {
  color: var(--text);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease;
}

.site-footer a:hover {
  border-bottom-color: currentColor;
}