/* ==========================================================================
   CSS Custom Properties (Design Tokens)
   ========================================================================== */

:root {
  /* --- Colors --- */
  --color-bg:             #f8f6f1;
  --color-surface:        #ffffff;
  --color-surface-alt:    #f1efe9;
  --color-border:         #e2dfd6;
  --color-border-hover:   #ccc8bc;

  --color-text-primary:   #1a1a2e;
  --color-text-secondary: #6b6b80;
  --color-text-muted:     #9a9aad;

  --color-accent:         #2d6a4f;
  --color-accent-hover:   #1b4332;
  --color-accent-light:   #e6f0eb;

  --color-dice-bg:        #ffffff;
  --color-dice-border:    #e2dfd6;
  --color-dice-dot:       #1a1a2e;
  --color-dice-number:    #1a1a2e;

  --color-result-bg:      #e6f0eb;
  --color-result-text:    #2d6a4f;

  /* --- Typography --- */
  --font-heading:         'Figtree', 'Inter', system-ui, sans-serif;
  --font-body:            'Inter', system-ui, sans-serif;

  --text-xs:              0.75rem;
  --text-sm:              0.875rem;
  --text-base:            1rem;
  --text-lg:              1.125rem;
  --text-xl:              1.25rem;
  --text-2xl:             1.5rem;
  --text-3xl:             2rem;
  --text-4xl:             2.5rem;

  --weight-normal:        400;
  --weight-medium:        500;
  --weight-semi:          600;
  --weight-bold:          700;

  --leading-tight:        1.2;
  --leading-normal:       1.5;

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

  /* --- Border Radius --- */
  --radius-sm:            0.5rem;
  --radius-md:            0.75rem;
  --radius-lg:            1rem;
  --radius-xl:            1.25rem;
  --radius-2xl:           1.5rem;
  --radius-full:          9999px;

  /* --- Shadows --- */
  --shadow-sm:            0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md:            0 2px 8px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-lg:            0 4px 16px rgba(0, 0, 0, 0.08), 0 2px 4px rgba(0, 0, 0, 0.04);
  --shadow-xl:            0 8px 32px rgba(0, 0, 0, 0.1), 0 2px 8px rgba(0, 0, 0, 0.04);

  /* --- Transitions --- */
  --transition-fast:      150ms ease;
  --transition-base:      250ms ease;
  --transition-slow:      400ms ease;

  /* --- Dice sizes --- */
  --dice-size:            140px;
  --dice-dot-size:        22px;
  --dice-gap:             var(--space-4);
}


/* ==========================================================================
   Reset & Base
   ========================================================================== */

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

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-normal);
  line-height: var(--leading-normal);
  color: var(--color-text-primary);
  background-color: var(--color-bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}


/* ==========================================================================
   Navigation
   ========================================================================== */

.nav {
  width: 100%;
  display: flex;
  justify-content: center;
  padding: var(--space-5) var(--space-6);
}

.nav-logo {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
}

.nav-logo-icon {
  display: block;
}

.nav-logo-text {
  font-family: var(--font-heading);
  font-size: var(--text-3xl);
  font-weight: var(--weight-bold);
  color: var(--color-text-primary);
  letter-spacing: -0.02em;
}


/* ==========================================================================
   App Container
   ========================================================================== */

.app {
  width: 100%;
  max-width: 640px;
  padding: var(--space-16) var(--space-6) var(--space-10);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-8);
}


/* ==========================================================================
   Header
   ========================================================================== */

.header {
  text-align: center;
}

.title {
  font-family: var(--font-heading);
  font-size: var(--text-4xl);
  font-weight: var(--weight-bold);
  color: var(--color-text-primary);
  line-height: var(--leading-tight);
  letter-spacing: -0.03em;
}

.subtitle {
  margin-top: var(--space-3);
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  font-weight: var(--weight-normal);
}


/* ==========================================================================
   Controls Card
   ========================================================================== */

.controls-card {
  width: 100%;
  display: flex;
  align-items: center;
  gap: var(--space-6);
  background: transparent;
  padding: 0;
  border: none;
  box-shadow: none;
}

.control-group {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.control-label {
  font-size: var(--text-xs);
  font-weight: var(--weight-semi);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.control-select {
  font-family: var(--font-body);
  font-size: var(--text-lg);
  font-weight: var(--weight-semi);
  color: var(--color-text-primary);
  background: var(--color-surface);
  border: 1px solid var(--color-text-primary);
  border-radius: var(--radius-md);
  height: 48px;
  padding: 0 var(--space-8) 0 var(--space-3);
  cursor: pointer;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' fill='none'%3E%3Cpath d='M1 1.5l5 5 5-5' stroke='%231a1a2e' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
}

.control-select:hover {
  border-color: var(--color-border-hover);
}

.control-select:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-light);
}

.control-divider {
  display: none;
}


/* ==========================================================================
   Modifier Button
   ========================================================================== */

.modifier-btn {
  flex-shrink: 0;
  align-self: flex-end;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-semi);
  color: var(--color-text-primary);
  background: var(--color-surface);
  border: 1px solid var(--color-text-primary);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: border-color var(--transition-fast), color var(--transition-fast), background var(--transition-fast);
  padding: 0;
  line-height: 1;
  white-space: nowrap;
}

.modifier-btn:hover {
  background: var(--color-surface-alt);
}

.modifier-btn--active {
  color: var(--color-text-primary);
  background: var(--color-surface);
  border-color: var(--color-text-primary);
  min-width: 40px;
}


/* ==========================================================================
   Modifier Modal
   ========================================================================== */

.modifier-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.3);
  z-index: 1000;
  align-items: center;
  justify-content: center;
}

.modifier-overlay--visible {
  display: flex;
}

.modifier-modal {
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  padding: var(--space-6);
  width: 280px;
  max-width: calc(100vw - 2rem);
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
  animation: resultFadeIn var(--transition-base) ease forwards;
}

.modifier-modal-title {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-bold);
  color: var(--color-text-primary);
  text-align: center;
}

.modifier-stepper {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
}

.modifier-stepper-btn {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-bold);
  color: var(--color-text-primary);
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: border-color var(--transition-fast), background var(--transition-fast);
  user-select: none;
  line-height: 1;
}

.modifier-stepper-btn:hover {
  border-color: var(--color-border-hover);
  background: var(--color-border);
}

.modifier-stepper-input {
  width: 72px;
  text-align: center;
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: var(--weight-bold);
  color: var(--color-text-primary);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-2);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  -moz-appearance: textfield;
  appearance: textfield;
}

.modifier-stepper-input::-webkit-outer-spin-button,
.modifier-stepper-input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.modifier-stepper-input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-light);
}

.modifier-apply-btn {
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-semi);
  color: #ffffff;
  background: var(--color-accent);
  border: none;
  border-radius: var(--radius-full);
  padding: var(--space-3) var(--space-6);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.modifier-apply-btn:hover {
  background: var(--color-accent-hover);
}


/* ==========================================================================
   Dice Area
   ========================================================================== */

.dice-area {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--dice-gap);
  min-height: var(--dice-size);
  align-items: center;
  margin-top: var(--space-4);
}


/* ==========================================================================
   Individual Die
   ========================================================================== */

.die {
  width: var(--dice-size);
  height: var(--dice-size);
  background: var(--color-dice-bg);
  border: 1px solid var(--color-text-primary);
  border-radius: var(--radius-lg);
  display: grid;
  grid-template-rows: 1fr 1fr 1fr;
  grid-template-columns: 1fr 1fr 1fr;
  padding: var(--space-3);
  position: relative;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

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

.die-number-text {
  font-family: var(--font-heading);
  font-size: var(--text-4xl);
  font-weight: var(--weight-bold);
  color: var(--color-dice-number);
  line-height: 1;
  user-select: none;
}

/* --- Dot --- */

.die-dot {
  width: var(--dice-dot-size);
  height: var(--dice-dot-size);
  background-color: var(--color-dice-dot);
  border-radius: var(--radius-full);
  align-self: center;
  justify-self: center;
}

/* Dot positioning using grid areas (row / col) */

/* Center dot (used in 1, 3, 5) */
.die-dot--center       { grid-row: 2; grid-column: 2; }

/* Top-left & bottom-right (used in 2, 3, 4, 5, 6) */
.die-dot--top-left     { grid-row: 1; grid-column: 1; }
.die-dot--bottom-right { grid-row: 3; grid-column: 3; }

/* Top-right & bottom-left (used in 4, 5, 6) */
.die-dot--top-right    { grid-row: 1; grid-column: 3; }
.die-dot--bottom-left  { grid-row: 3; grid-column: 1; }

/* Middle-left & middle-right (used in 6) */
.die-dot--mid-left     { grid-row: 2; grid-column: 1; }
.die-dot--mid-right    { grid-row: 2; grid-column: 3; }


/* ==========================================================================
   Rolling Animation
   ========================================================================== */

.die--rolling {
  animation: diceRoll 0.6s ease-in-out;
}

@keyframes diceRoll {
  0%   { transform: rotate(0deg) scale(1); }
  15%  { transform: rotate(15deg) scale(0.92); }
  30%  { transform: rotate(-12deg) scale(1.04); }
  45%  { transform: rotate(10deg) scale(0.96); }
  60%  { transform: rotate(-8deg) scale(1.02); }
  75%  { transform: rotate(4deg) scale(0.98); }
  90%  { transform: rotate(-2deg) scale(1.01); }
  100% { transform: rotate(0deg) scale(1); }
}

/* Randomize animation appearance per die */
.die--rolling:nth-child(2) { animation-delay: 50ms; }
.die--rolling:nth-child(3) { animation-delay: 100ms; }
.die--rolling:nth-child(4) { animation-delay: 60ms; }
.die--rolling:nth-child(5) { animation-delay: 120ms; }
.die--rolling:nth-child(6) { animation-delay: 80ms; }

/* Landing pop for final result */
.die--landed {
  animation: dieLand 0.3s ease-out;
}

@keyframes dieLand {
  0%   { transform: scale(0.9); opacity: 0.7; }
  60%  { transform: scale(1.05); opacity: 1; }
  100% { transform: scale(1); opacity: 1; }
}


/* ==========================================================================
   Result Container (prompt + result share the same slot)
   ========================================================================== */

.result-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-1);
  min-height: 3rem;
}

.roll-prompt {
  font-size: var(--text-base);
  font-weight: var(--weight-medium);
  color: var(--color-text-secondary);
  text-align: center;
  letter-spacing: 0.02em;
}

.roll-prompt--hidden {
  display: none;
}

.result-display {
  display: none;
  flex-direction: column;
  align-items: center;
  gap: var(--space-1);
  animation: resultFadeIn var(--transition-base) ease forwards;
}

.result-display--visible {
  display: flex;
}

/* Equation result (3 + 2 = 5) */
.result-display--multi {
  flex-direction: column;
  gap: var(--space-1);
}

.result-equation {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-heading);
  line-height: var(--leading-tight);
}

.result-equation-part {
  font-size: var(--text-xl);
  font-weight: var(--weight-semi);
  color: var(--color-text-secondary);
}

.result-equation-equals {
  color: var(--color-text-muted);
  font-weight: var(--weight-normal);
  padding: 0 var(--space-1);
}

.result-equation-total {
  font-family: var(--font-heading);
  font-size: var(--text-3xl);
  font-weight: var(--weight-bold);
  color: var(--color-text-primary);
  background: var(--color-surface);
  border: 1px solid var(--color-text-primary);
  padding: var(--space-1) var(--space-6);
  border-radius: var(--radius-full);
  line-height: var(--leading-tight);
  min-width: 80px;
  text-align: center;
}

@keyframes resultFadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to   { opacity: 1; transform: translateY(0); }
}

.result-label {
  font-size: var(--text-xs);
  font-weight: var(--weight-semi);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.result-value {
  font-family: var(--font-heading);
  font-size: var(--text-3xl);
  font-weight: var(--weight-bold);
  color: var(--color-text-primary);
  background: var(--color-surface);
  border: 1px solid var(--color-text-primary);
  padding: var(--space-1) var(--space-6);
  border-radius: var(--radius-full);
  line-height: var(--leading-tight);
  min-width: 80px;
  text-align: center;
  transition: opacity var(--transition-fast);
}

.result-value--shuffling {
  opacity: 0.4;
}


/* ==========================================================================
   Roll Button
   ========================================================================== */

.roll-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-body);
  font-size: var(--text-lg);
  font-weight: var(--weight-semi);
  color: #ffffff;
  background: var(--color-accent);
  border: none;
  border-radius: var(--radius-full);
  padding: var(--space-4) var(--space-10);
  cursor: pointer;
  box-shadow: var(--shadow-lg);
  transition: background var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
  user-select: none;
}

.roll-btn:hover {
  background: var(--color-accent-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-xl);
}

.roll-btn:active {
  transform: translateY(0);
  box-shadow: var(--shadow-md);
}

.roll-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
  box-shadow: var(--shadow-sm);
}

.roll-btn-icon {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
}

.roll-hint {
  display: none;
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-align: center;
}

@media (hover: hover) {
  .roll-hint {
    display: block;
  }
}


/* ==========================================================================
   Roll History
   ========================================================================== */

.roll-history-section {
  width: 100%;
  max-width: 640px;
  margin: 0 auto;
  padding: var(--space-8) var(--space-6) 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.roll-history-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.roll-history-heading {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: var(--weight-bold);
  color: var(--color-text-primary);
  line-height: var(--leading-tight);
  letter-spacing: -0.02em;
}

.roll-history-clear {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: var(--weight-semi);
  color: #ffffff;
  background: #d94040;
  border: none;
  cursor: pointer;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  transition: background var(--transition-fast);
}

.roll-history-clear:hover {
  background: #b83232;
}

.roll-history-table {
  width: 100%;
  display: flex;
  flex-direction: column;
}

.roll-history-header {
  display: flex;
  align-items: center;
  padding: var(--space-2) var(--space-3);
  border-bottom: 1px solid var(--color-text-primary);
  font-size: var(--text-xs);
  font-weight: var(--weight-semi);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.roll-history-row {
  display: flex;
  align-items: center;
  padding: var(--space-2) var(--space-3);
  border-bottom: 1px solid var(--color-border);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  font-variant-numeric: tabular-nums;
}

.roll-history-row:last-child {
  border-bottom: none;
}

.roll-history-row--latest {
  color: var(--color-text-primary);
  font-weight: var(--weight-medium);
}

.roll-history-col-no,
.roll-history-col-roll,
.roll-history-col-mod,
.roll-history-col-total {
  flex: 1;
}

.roll-history-col-mod {
  text-align: center;
}

.roll-history-col-total {
  text-align: right;
  font-weight: var(--weight-semi);
}


/* ==========================================================================
   SEO Content Sections
   ========================================================================== */

.content {
  width: 100%;
  max-width: 640px;
  margin: 0 auto;
  padding: var(--space-8) var(--space-6) var(--space-16);
  display: flex;
  flex-direction: column;
  gap: var(--space-12);
}

.content-section {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.content-heading {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: var(--weight-bold);
  color: var(--color-text-primary);
  line-height: var(--leading-tight);
  letter-spacing: -0.02em;
}

.content-section p {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.content-section a {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-color: var(--color-border-hover);
  text-underline-offset: 2px;
  transition: text-decoration-color var(--transition-fast);
}

.content-section a:hover {
  text-decoration-color: var(--color-accent);
}

.content-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding-left: var(--space-5);
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.content-list strong {
  color: var(--color-text-primary);
  font-weight: var(--weight-semi);
}


/* ==========================================================================
   Content Table (probability tables etc.)
   ========================================================================== */

.content-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.content-table th {
  font-size: var(--text-xs);
  font-weight: var(--weight-semi);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  text-align: left;
  padding: var(--space-2) var(--space-3);
  border-bottom: 1px solid var(--color-border);
}

.content-table td {
  padding: var(--space-2) var(--space-3);
  border-bottom: 1px solid var(--color-border);
}

.content-table tbody tr:last-child td {
  border-bottom: none;
}

.content-table td:first-child {
  font-weight: var(--weight-semi);
  color: var(--color-text-primary);
}


/* ==========================================================================
   Popular Rolls (internal link grid on roll pages)
   ========================================================================== */

.popular-rolls {
  width: 100%;
  max-width: 640px;
  margin: 0 auto;
  padding: var(--space-8) var(--space-6) var(--space-16);
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.popular-rolls-heading {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-bold);
  color: var(--color-text-primary);
  letter-spacing: -0.02em;
}

.popular-rolls-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.popular-rolls-grid a {
  display: inline-flex;
  align-items: center;
  padding: var(--space-2) var(--space-4);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-accent);
  background: var(--color-accent-light);
  border-radius: var(--radius-full);
  text-decoration: none;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.popular-rolls-grid a:hover {
  background: var(--color-accent);
  color: #ffffff;
}


/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
  width: 100%;
  max-width: 640px;
  margin: 0 auto;
  padding: var(--space-8) var(--space-6);
  text-align: center;
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}


/* ==========================================================================
   Responsive
   ========================================================================== */

@media (max-width: 480px) {
  :root {
    --dice-size: 85px;
    --dice-dot-size: 14px;
  }

  .app {
    padding: var(--space-6) var(--space-4);
    gap: var(--space-6);
  }

  .title {
    font-size: 1.625rem;
  }

  .controls-card {
    background: transparent;
    border: none;
    box-shadow: none;
    gap: var(--space-3);
    padding: 0;
  }

  .control-select {
    height: 44px;
    font-size: var(--text-base);
  }

  .control-divider {
    display: none;
  }

  .roll-btn {
    width: 100%;
    justify-content: center;
  }

  .die-number-text {
    font-size: var(--text-3xl);
  }

  .content {
    padding: var(--space-6) var(--space-4) var(--space-12);
    gap: var(--space-8);
  }

  .content-heading {
    font-size: var(--text-xl);
  }

  .result-value {
    font-size: var(--text-2xl);
  }

  .modifier-btn {
    width: 44px;
    height: 44px;
    font-size: var(--text-sm);
  }


  .result-equation {
    gap: var(--space-1);
  }

  .result-equation-part {
    font-size: var(--text-base);
  }

  .result-equation-total {
    font-size: var(--text-2xl);
    min-width: 60px;
    padding: var(--space-1) var(--space-4);
  }

  .roll-history-section {
    padding: var(--space-6) var(--space-4) 0;
  }

  .roll-history-heading {
    font-size: var(--text-xl);
  }
}