/**
 * Base Resets, Layout & Subtle Tactile Surfaces
 */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  color-scheme: dark;
}

[data-theme="light"] {
  color-scheme: light;
}

body {
  min-height: 100vh;
  min-height: 100dvh;
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.5;
  overscroll-behavior-y: none;
  overflow-x: hidden;
  transition: background-color var(--duration-dim) var(--ease-smooth),
              color var(--duration-dim) var(--ease-smooth);
  position: relative;
  user-select: none;
  -webkit-user-select: none;
}

/* Subtle peaceful grain texture overlay */
.bg-grain {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
  transition: opacity var(--duration-slow) var(--ease-smooth);
}

body.is-dimmed .bg-grain {
  opacity: 0;
}

/* App Shell Container */
#app {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  min-height: 100dvh;
  padding-top: max(16px, var(--sat));
  padding-bottom: max(16px, var(--sab));
  padding-left: max(16px, var(--sal));
  padding-right: max(16px, var(--sar));
  max-width: var(--max-content-width);
  margin: 0 auto;
}

/* Header & Navigation */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  padding: 0 8px;
  transition: opacity var(--duration-base) var(--ease-smooth),
              transform var(--duration-base) var(--ease-smooth);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-serif);
  font-size: 1.15rem;
  letter-spacing: 0.03em;
  color: var(--color-text);
  font-weight: 500;
}

.brand-icon {
  width: 22px;
  height: 22px;
  stroke: var(--color-accent);
  fill: none;
  stroke-width: 1.75;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}

/* General Button Styles */
button {
  background: transparent;
  border: none;
  color: inherit;
  font: inherit;
  cursor: pointer;
  outline: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all var(--duration-fast) var(--ease-smooth);
  touch-action: manipulation;
}

button:focus-visible,
a:focus-visible,
input:focus-visible {
  outline: 2px solid var(--color-border-focus);
  outline-offset: 2px;
}

.btn-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  color: var(--color-text-secondary);
  border: 1px solid transparent;
}

.btn-icon:hover {
  color: var(--color-text);
  background-color: var(--color-surface);
  border-color: var(--color-border-subtle);
}

.btn-icon:active {
  background-color: var(--color-surface-active);
  transform: scale(0.96);
}

.btn-icon.is-active {
  color: var(--color-accent);
  background-color: var(--color-accent-subtle);
}

.btn-icon svg {
  width: 20px;
  height: 20px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.75;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* Primary Action Buttons */
.btn-primary {
  height: 52px;
  padding: 0 32px;
  border-radius: var(--radius-full);
  background-color: var(--color-accent);
  color: #0e0f11;
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: 0.04em;
  box-shadow: 0 4px 20px var(--color-accent-glow);
  transition: transform var(--duration-fast) var(--ease-spring),
              box-shadow var(--duration-fast) var(--ease-smooth),
              background-color var(--duration-fast) var(--ease-smooth);
}

.btn-primary:hover {
  background-color: var(--color-accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 6px 24px var(--color-accent-glow);
}

.btn-primary:active {
  transform: translateY(1px) scale(0.98);
  box-shadow: 0 2px 10px var(--color-accent-glow);
}

.btn-secondary {
  height: 46px;
  padding: 0 22px;
  border-radius: var(--radius-full);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--color-text);
  font-size: 0.95rem;
}

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

.btn-secondary:active {
  transform: scale(0.97);
}

.btn-ghost {
  height: 40px;
  padding: 0 16px;
  border-radius: var(--radius-full);
  color: var(--color-text-secondary);
  font-size: 0.9rem;
}

.btn-ghost:hover {
  color: var(--color-text);
  background-color: var(--color-surface);
}

/* Nav Tabs */
.mode-tabs {
  display: inline-flex;
  align-items: center;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: 4px;
  border-radius: var(--radius-full);
  gap: 2px;
  margin: 0 auto;
}

.mode-tab {
  padding: 6px 16px;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--color-text-secondary);
  transition: all var(--duration-fast) var(--ease-smooth);
}

.mode-tab:hover {
  color: var(--color-text);
}

.mode-tab.is-active {
  background-color: var(--color-accent-subtle);
  color: var(--color-accent);
  font-weight: 600;
}

/* Modal Overlay & Card System */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  background-color: rgba(5, 6, 7, 0.75);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--duration-base) var(--ease-smooth);
}

.modal-overlay.is-open {
  opacity: 1;
  pointer-events: auto;
}

.modal-dialog {
  background-color: var(--color-bg-subtle);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 520px;
  max-height: calc(100dvh - 48px);
  overflow-y: auto;
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.5);
  display: flex;
  flex-direction: column;
  transform: translateY(12px) scale(0.98);
  transition: transform var(--duration-base) var(--ease-spring);
}

.modal-overlay.is-open .modal-dialog {
  transform: translateY(0) scale(1);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px 16px;
  border-bottom: 1px solid var(--color-border-subtle);
}

.modal-title {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 500;
  color: var(--color-text);
}

.modal-body {
  padding: 20px 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.modal-footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 12px;
  padding: 16px 24px 20px;
  border-top: 1px solid var(--color-border-subtle);
}

/* Silent Mode Flash Overlay (Safe Gentle Bloom) */
.silent-flash-overlay {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 999;
  background-color: #f7f3ec;
  opacity: 0;
}

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