/* Lakeside Nocturne — Base Foundation */

:root {
  /* Color Tokens */
  --color-lake-blue: #1A2E3B;
  --color-ivory: #F5F0E8;
  --color-copper: #B87333;
  --color-burgundy: #6B2D3C;
  --color-slate: #4A5B6A;
  --color-walnut: #3E2C1F;
  --color-mist: #D9E2E8;
  --color-silver: #A8B4BD;

  /* Functional Colors */
  --color-background: var(--color-lake-blue);
  --color-foreground: var(--color-ivory);
  --color-accent: var(--color-copper);
  --color-accent-hover: var(--color-burgundy);
  --color-surface: var(--color-slate);
  --color-surface-deep: var(--color-walnut);
  --color-surface-light: var(--color-mist);
  --color-text-muted: var(--color-silver);
  --color-border: rgba(168, 180, 189, 0.2);
  --color-border-strong: rgba(168, 180, 189, 0.4);
  --color-focus: var(--color-copper);
  --color-overlay: rgba(26, 46, 59, 0.8);

  /* Typography */
  --font-heading: 'Playfair Display', Georgia, serif;
  --font-body: 'Inter', 'Helvetica Neue', Arial, sans-serif;

  --font-size-display: clamp(2.5rem, 5vw, 4rem);
  --font-size-h1: clamp(2rem, 4vw, 3rem);
  --font-size-h2: clamp(1.75rem, 3vw, 2.25rem);
  --font-size-h3: clamp(1.375rem, 2.5vw, 1.75rem);
  --font-size-h4: clamp(1.125rem, 2vw, 1.375rem);
  --font-size-body-large: 1.25rem;
  --font-size-body: 1rem;
  --font-size-body-small: 0.875rem;
  --font-size-caption: 0.75rem;

  --line-height-display: 1.1;
  --line-height-h1: 1.15;
  --line-height-h2: 1.2;
  --line-height-h3: 1.3;
  --line-height-h4: 1.4;
  --line-height-body-large: 1.6;
  --line-height-body: 1.6;
  --line-height-body-small: 1.5;
  --line-height-caption: 1.4;

  --letter-spacing-display: -0.02em;
  --letter-spacing-h1: -0.01em;
  --letter-spacing-h2: 0;
  --letter-spacing-h3: 0;
  --letter-spacing-h4: 0.01em;
  --letter-spacing-body: 0.01em;
  --letter-spacing-caption: 0.02em;
  --letter-spacing-nav: 0.08em;

  /* Spacing Scale */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 16px;
  --space-4: 24px;
  --space-5: 32px;
  --space-6: 48px;
  --space-7: 64px;
  --space-8: 96px;
  --space-9: 128px;

  /* Containers */
  --container-max: 1200px;
  --container-wide: 1440px;
  --container-padding-mobile: 24px;
  --container-padding-tablet: 48px;
  --container-padding-desktop: 64px;
  --section-spacing-desktop: 96px;
  --section-spacing-mobile: 64px;

  /* Surfaces */
  --radius-button: 2px;
  --radius-card: 4px;
  --radius-image: 0px;
  --shadow-modal: 0 8px 24px rgba(0, 0, 0, 0.3);

  /* Transitions */
  --transition-fast: 200ms ease;
  --transition-medium: 300ms ease;
}

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

html {
  -webkit-text-size-adjust: 100%;
  -moz-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: var(--font-size-body);
  line-height: var(--line-height-body);
  letter-spacing: var(--letter-spacing-body);
  font-weight: 400;
  color: var(--color-foreground);
  background-color: var(--color-background);
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
  height: auto;
}

input,
button,
textarea,
select {
  font: inherit;
  letter-spacing: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  border: none;
  background: none;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-accent-hover);
}

ul,
ol {
  list-style-position: inside;
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  color: var(--color-foreground);
  line-height: 1.2;
}

h1 {
  font-size: var(--font-size-h1);
  line-height: var(--line-height-h1);
  letter-spacing: var(--letter-spacing-h1);
  margin-block-end: var(--space-4);
}

h2 {
  font-size: var(--font-size-h2);
  line-height: var(--line-height-h2);
  letter-spacing: var(--letter-spacing-h2);
  margin-block-end: var(--space-3);
}

h3 {
  font-size: var(--font-size-h3);
  line-height: var(--line-height-h3);
  letter-spacing: var(--letter-spacing-h3);
  margin-block-end: var(--space-3);
}

h4 {
  font-size: var(--font-size-h4);
  line-height: var(--line-height-h4);
  letter-spacing: var(--letter-spacing-h4);
  margin-block-end: var(--space-2);
}

h5,
h6 {
  font-size: var(--font-size-body);
  line-height: var(--line-height-body);
  letter-spacing: var(--letter-spacing-body);
  margin-block-end: var(--space-2);
}

p {
  font-size: var(--font-size-body);
  line-height: var(--line-height-body);
  letter-spacing: var(--letter-spacing-body);
  margin-block-end: var(--space-3);
}

blockquote {
  font-family: var(--font-heading);
  font-size: var(--font-size-body-large);
  line-height: var(--line-height-body-large);
  letter-spacing: var(--letter-spacing-body);
  margin-block-end: var(--space-4);
  padding-inline-start: var(--space-4);
  border-inline-start: 2px solid var(--color-accent);
}

ul,
ol {
  margin-block-end: var(--space-3);
  padding-inline-start: var(--space-4);
}

li {
  line-height: var(--line-height-body);
}

dl {
  margin-block-end: var(--space-3);
}

dt {
  font-weight: 700;
}

dd {
  margin-block-end: var(--space-2);
  margin-inline-start: var(--space-4);
}

figure {
  margin-block-end: var(--space-4);
}

figcaption {
  font-size: var(--font-size-caption);
  line-height: var(--line-height-caption);
  letter-spacing: var(--letter-spacing-caption);
  color: var(--color-text-muted);
  margin-block-start: var(--space-2);
}

hr {
  border: none;
  border-block-start: 1px solid var(--color-border);
  margin-block: var(--space-6);
}

small {
  font-size: var(--font-size-body-small);
  line-height: var(--line-height-body-small);
}

strong {
  font-weight: 700;
}

em {
  font-style: italic;
}

code,
kbd,
samp,
pre {
  font-family: 'SF Mono', 'Cascadia Code', 'Roboto Mono', Consolas, monospace;
  font-size: 0.9em;
}

pre {
  background-color: var(--color-surface);
  padding: var(--space-3);
  border-radius: var(--radius-card);
  overflow-x: auto;
  margin-block-end: var(--space-3);
}

/* Media */
img {
  border-radius: var(--radius-image);
}

/* Forms */
label {
  display: block;
  font-size: var(--font-size-caption);
  line-height: var(--line-height-caption);
  letter-spacing: var(--letter-spacing-nav);
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-block-end: var(--space-2);
}

input,
textarea,
select {
  display: block;
  width: 100%;
  padding: var(--space-3);
  font-size: var(--font-size-body);
  line-height: var(--line-height-body);
  letter-spacing: var(--letter-spacing-body);
  color: var(--color-ivory);
  background-color: var(--color-mist);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-card);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

input::placeholder,
textarea::placeholder {
  color: var(--color-slate);
}

input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--color-focus);
  box-shadow: 0 0 0 2px var(--color-focus);
  box-shadow: 0 0 0 2px var(--color-focus), 0 0 0 4px rgba(184, 115, 51, 0.2);
}

textarea {
  min-height: 120px;
  resize: vertical;
}

select {
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%23A8B4BD' stroke-width='2' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--space-3) center;
  padding-inline-end: var(--space-6);
}

fieldset {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: var(--space-4);
  margin-block-end: var(--space-4);
}

legend {
  font-size: var(--font-size-caption);
  line-height: var(--line-height-caption);
  letter-spacing: var(--letter-spacing-nav);
  text-transform: uppercase;
  color: var(--color-text-muted);
  padding-inline: var(--space-2);
}

/* Focus Styles */
:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

/* Containers */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-padding-mobile);
}

.container-wide {
  width: 100%;
  max-width: var(--container-wide);
  margin-inline: auto;
  padding-inline: var(--container-padding-mobile);
}

@media (min-width: 768px) {
  .container,
  .container-wide {
    padding-inline: var(--container-padding-tablet);
  }
}

@media (min-width: 1024px) {
  .container,
  .container-wide {
    padding-inline: var(--container-padding-desktop);
  }
}

/* Reusable Primitives */

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: var(--space-3) var(--space-5);
  font-family: var(--font-body);
  font-size: var(--font-size-body-small);
  font-weight: 700;
  letter-spacing: var(--letter-spacing-nav);
  text-transform: uppercase;
  border-radius: var(--radius-button);
  transition: background-color var(--transition-fast), color var(--transition-fast),
    border-color var(--transition-fast), transform var(--transition-fast);
  text-align: center;
  white-space: nowrap;
  user-select: none;
  -webkit-user-select: none;
  -moz-user-select: none;
}

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

.btn-primary {
  background-color: var(--color-accent);
  color: var(--color-ivory);
  border: 2px solid var(--color-accent);
}

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

.btn-secondary {
  background-color: transparent;
  color: var(--color-accent);
  border: 2px solid var(--color-accent);
}

.btn-secondary:hover {
  background-color: var(--color-accent);
  color: var(--color-ivory);
  border-color: var(--color-accent);
}

.btn-text {
  background-color: transparent;
  color: var(--color-accent);
  border: none;
  padding-inline: var(--space-2);
}

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

/* Cards */
.card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: var(--space-4);
}

.card > :last-child {
  margin-block-end: 0;
}

/* Surfaces */
.surface-light {
  background-color: var(--color-surface-light);
  color: var(--color-lake-blue);
}

.surface-light h1,
.surface-light h2,
.surface-light h3,
.surface-light h4,
.surface-light h5,
.surface-light h6 {
  color: var(--color-lake-blue);
}

.surface-light p,
.surface-light li,
.surface-light dd {
  color: var(--color-lake-blue);
}

.surface-light .card {
  background-color: var(--color-ivory);
  border-color: var(--color-border);
}

.surface-deep {
  background-color: var(--color-surface-deep);
  color: var(--color-ivory);
}

.surface-deep .card {
  background-color: var(--color-slate);
  border-color: var(--color-border);
}

/* Text Utilities */
.text-display {
  font-family: var(--font-heading);
  font-size: var(--font-size-display);
  line-height: var(--line-height-display);
  letter-spacing: var(--letter-spacing-display);
  font-weight: 700;
  margin-block-end: var(--space-4);
}

.text-body-large {
  font-size: var(--font-size-body-large);
  line-height: var(--line-height-body-large);
  letter-spacing: var(--letter-spacing-body);
}

.text-body-small {
  font-size: var(--font-size-body-small);
  line-height: var(--line-height-body-small);
  letter-spacing: var(--letter-spacing-body);
}

.text-caption {
  font-size: var(--font-size-caption);
  line-height: var(--line-height-caption);
  letter-spacing: var(--letter-spacing-caption);
}

.text-muted {
  color: var(--color-text-muted);
}

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

.text-uppercase {
  text-transform: uppercase;
  letter-spacing: var(--letter-spacing-nav);
}

/* Layout Utilities */
.flex {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  min-width: 0;
}

.flex > * {
  min-width: 0;
  flex-shrink: 1;
}

.flex-nowrap {
  flex-wrap: nowrap;
}

.flex-column {
  flex-direction: column;
}

.flex-center {
  align-items: center;
  justify-content: center;
}

.flex-between {
  align-items: center;
  justify-content: space-between;
}

.flex-start {
  align-items: flex-start;
  justify-content: flex-start;
}

.flex-end {
  align-items: flex-end;
  justify-content: flex-end;
}

.flex-1 {
  flex: 1 1 0%;
  min-width: 0;
}

.flex-auto {
  flex: 0 1 auto;
  min-width: 0;
}

.flex-none {
  flex: 0 0 auto;
}

/* Spacing Utilities */
.mt-1 { margin-block-start: var(--space-1); }
.mt-2 { margin-block-start: var(--space-2); }
.mt-3 { margin-block-start: var(--space-3); }
.mt-4 { margin-block-start: var(--space-4); }
.mt-5 { margin-block-start: var(--space-5); }
.mt-6 { margin-block-start: var(--space-6); }
.mt-7 { margin-block-start: var(--space-7); }
.mt-8 { margin-block-start: var(--space-8); }
.mt-9 { margin-block-start: var(--space-9); }

.mb-1 { margin-block-end: var(--space-1); }
.mb-2 { margin-block-end: var(--space-2); }
.mb-3 { margin-block-end: var(--space-3); }
.mb-4 { margin-block-end: var(--space-4); }
.mb-5 { margin-block-end: var(--space-5); }
.mb-6 { margin-block-end: var(--space-6); }
.mb-7 { margin-block-end: var(--space-7); }
.mb-8 { margin-block-end: var(--space-8); }
.mb-9 { margin-block-end: var(--space-9); }

.p-1 { padding: var(--space-1); }
.p-2 { padding: var(--space-2); }
.p-3 { padding: var(--space-3); }
.p-4 { padding: var(--space-4); }
.p-5 { padding: var(--space-5); }
.p-6 { padding: var(--space-6); }
.p-7 { padding: var(--space-7); }
.p-8 { padding: var(--space-8); }
.p-9 { padding: var(--space-9); }

/* Section Spacing */
.section {
  padding-block: var(--section-spacing-mobile);
}

@media (min-width: 768px) {
  .section {
    padding-block: var(--section-spacing-desktop);
  }
}

/* Safe Last-Child Handling */
.card > :last-child,
.surface-light > :last-child,
.surface-deep > :last-child,
.section > :last-child,
.container > :last-child,
.container-wide > :last-child,
article > :last-child,
aside > :last-child,
footer > :last-child,
header > :last-child,
main > :last-child,
nav > :last-child,
form > :last-child,
fieldset > :last-child,
blockquote > :last-child,
figure > :last-child,
li > :last-child,
dl > :last-child {
  margin-block-end: 0;
}

/* Content List Spacing — scoped to avoid affecting nav/flex lists */
.content-list {
  margin-block-end: var(--space-3);
  padding-inline-start: var(--space-4);
}

.content-list li {
  margin-block-end: var(--space-2);
}

.content-list li:last-child {
  margin-block-end: 0;
}

/* Responsive Typography Adjustments */
@media (max-width: 767px) {
  :root {
    --font-size-display: 2.5rem;
    --font-size-h1: 2rem;
    --font-size-h2: 1.75rem;
    --font-size-h3: 1.375rem;
    --font-size-h4: 1.125rem;
    --font-size-body-large: 1.125rem;
  }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}