/* mobile overrides */

:root {
  --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;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  
  --color-bg-dark: #0a0a0f;
  --color-bg-darker: #050508;
  --color-accent-light: #4df2ff;
  --color-accent-3-light: #4de8ff;

  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
  
  --border-radius-sm: 0.25rem;
  --border-radius-md: 0.375rem;
  --border-radius-lg: 0.5rem;
  --border-radius-xl: 0.75rem;
  --border-radius-2xl: 1rem;
  --border-radius-full: 9999px;
  
  --transition-fast: 0.15s ease-out;
  --transition-normal: 0.25s ease-out;
  --transition-slow: 0.3s ease-out;
}

/* narrow 1024px */
@media (max-width: 1024px) {
  :root {
    --element-size: 42px;
    --element-gap: 2px;
    --font-size-symbol: 0.85rem;
    --font-size-name: 0.36rem;
    --font-size-atomic: 0.48rem;
    --border-radius-element: 5px;
  }

  .site-header {
    flex-direction: column;
    padding: var(--space-3) var(--space-4);
    gap: var(--space-3);
    text-align: center;
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    backdrop-filter: blur(25px) saturate(200%);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    background: rgba(15, 15, 25, 0.98);
  }
  
  .site-header .logo {
    font-size: var(--font-size-xl);
    gap: var(--space-2);
    font-weight: var(--font-weight-bold);
    flex-direction: row;
    align-items: center;
    justify-content: center;
  }
  
  .logo-image {
    width: 32px;
    height: 32px;
    border-radius: var(--border-radius-md);
    border-width: 1.5px;
  }
  
  .main-nav {
    gap: var(--space-2);
    flex-wrap: wrap;
    justify-content: center;
    width: 100%;
  }
  
  .main-nav a {
    padding: var(--space-2) var(--space-3);
    font-size: var(--font-size-sm);
    background: rgba(255, 255, 255, 0.06);
    border-radius: var(--border-radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.1);
    font-weight: var(--font-weight-medium);
    flex: 1;
    min-width: 120px;
    text-align: center;
    margin: 2px;
  }

  .search-overlay {
    padding: 0 var(--space-3);
    margin: var(--space-3) auto;
    position: sticky;
    top: 70px;
    background: rgba(21, 21, 34, 0.95);
    backdrop-filter: blur(25px) saturate(180%);
    z-index: var(--z-fixed);
    padding-top: var(--space-3);
    padding-bottom: var(--space-3);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  }
  
  .search-box {
    max-width: 100%;
    display: flex;
    gap: var(--space-2);
    align-items: center;
    position: relative;
  }
  
  .search-box input {
    flex: 1;
    padding: var(--space-3) var(--space-4);
    font-size: var(--font-size-sm);
    background: rgba(40, 40, 60, 0.9);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius-lg);
    font-weight: var(--font-weight-medium);
    padding-right: var(--space-10);
    padding-left: var(--space-10);
  }
  
  .search-box::before {
    content: "🔍";
    position: absolute;
    right: var(--space-3);
    top: 50%;
    transform: translateY(-50%);
    font-size: var(--font-size-base);
    color: rgba(255, 255, 255, 0.6);
    z-index: 2;
  }
  
  .search-box button {
    left: var(--space-2);
    width: 32px;
    height: 32px;
    font-size: var(--font-size-lg);
  }

  #viewElementBtn {
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-3));
    color: var(--color-bg-dark);
    border: none;
    padding: var(--space-3) var(--space-4);
    border-radius: var(--border-radius-lg);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    cursor: pointer;
    white-space: nowrap;
    display: none;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
    position: absolute;
    right: var(--space-2);
    top: 50%;
    transform: translateY(-50%);
    z-index: 3;
  }

  #viewElementBtn:hover {
    transform: translateY(-50%) scale(1.05);
    box-shadow: var(--shadow-lg);
  }

  .table-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-4);
    padding: var(--space-2);
    width: 100%;
    margin: 0 auto;
    direction: ltr;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scroll-behavior: auto;
    position: relative;
  }

  .periodic-table {
    display: grid;
    grid-template-columns: repeat(18, var(--element-size));
    grid-template-rows: repeat(8, var(--element-size));
    gap: var(--element-gap);
    width: max-content;
    direction: ltr;
    margin: 0 auto;
    padding: var(--space-2);
    transform-origin: center;
  }

  .series-container {
    display: flex;
    flex-direction: column;
    gap: var(--element-gap);
    width: max-content;
    direction: ltr;
    margin: 0 auto;
    padding: var(--space-2);
  }
  
  .element-row {
    display: grid;
    grid-template-columns: repeat(15, var(--element-size));
    gap: var(--element-gap);
    direction: ltr;
    width: max-content;
    height: var(--element-size);
  }

  .element-cell {
    position: relative;
    padding: 0.15em 0.08em;
    border-radius: var(--border-radius-element);
    width: var(--element-size) !important;
    height: var(--element-size) !important;
    min-width: var(--element-size) !important;
    min-height: var(--element-size) !important;
    max-width: var(--element-size) !important;
    max-height: var(--element-size) !important;
    direction: rtl;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    transition: none;
    box-shadow: 
      var(--shadow-sm),
      inset 0 1px 0 rgba(255, 255, 255, 0.08),
      inset 0 -1px 0 rgba(0, 0, 0, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.12);
    overflow: hidden;
    font-family: var(--font-family);
    box-sizing: border-box;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.04));
    backdrop-filter: blur(5px);
  }

  .element-cell {
    aspect-ratio: unset !important;
  }

  .element-cell:hover {
    transform: none;
    z-index: var(--z-popover);
    box-shadow: 
      0 3px 12px rgba(0, 212, 255, 0.4),
      0 0 0 1px rgba(0, 212, 255, 0.2),
      inset 0 1px 0 rgba(255, 255, 255, 0.1);
  }
  
  .element-cell .atomic-number {
    position: absolute;
    top: 0.1em;
    right: 0.15em;
    font-size: var(--font-size-atomic);
    font-weight: var(--font-weight-bold);
    opacity: 0.9;
    line-height: 1;
    color: rgba(255, 255, 255, 0.9);
    text-shadow: 
      0 1px 1px rgba(0, 0, 0, 0.5),
      0 0 2px rgba(0, 0, 0, 0.3);
  }
  
  .element-cell .symbol {
    font-size: var(--font-size-symbol);
    font-weight: var(--font-weight-extrabold);
    line-height: 1;
    margin: auto 0;
    color: rgba(255, 255, 255, 0.95);
    text-shadow: 
      0 1px 2px rgba(0, 0, 0, 0.6),
      0 0 3px rgba(0, 0, 0, 0.4);
    letter-spacing: -0.01em;
  }
  
  .element-cell .fa-name {
    font-size: var(--font-size-name);
    line-height: 1;
    max-width: 88%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    margin-bottom: 0.1em;
    opacity: 0.85;
    font-weight: var(--font-weight-semibold);
    color: rgba(255, 255, 255, 0.9);
    text-shadow: 
      0 1px 1px rgba(0, 0, 0, 0.5),
      0 0 2px rgba(0, 0, 0, 0.3);
  }

  .فلز-قلیایی { 
    background: linear-gradient(135deg, #ff6b35, #ff8e35);
    border-color: rgba(255, 107, 53, 0.4);
    box-shadow: 
      var(--shadow-sm),
      inset 0 1px 0 rgba(255, 255, 255, 0.15),
      inset 0 -1px 0 rgba(178, 75, 29, 0.3);
  }
  
  .فلز-قلیایی-خاکی { 
    background: linear-gradient(135deg, #ffd166, #ffb347);
    border-color: rgba(255, 209, 102, 0.4);
    box-shadow: 
      var(--shadow-sm),
      inset 0 1px 0 rgba(255, 255, 255, 0.15),
      inset 0 -1px 0 rgba(204, 167, 82, 0.3);
  }
  
  .فلز-انتقالی { 
    background: linear-gradient(135deg, #118ab2, #06d6a0);
    border-color: rgba(17, 138, 178, 0.4);
    box-shadow: 
      var(--shadow-sm),
      inset 0 1px 0 rgba(255, 255, 255, 0.15),
      inset 0 -1px 0 rgba(14, 110, 142, 0.3);
  }
  
  .لانتانید { 
    background: linear-gradient(135deg, #7209b7, #4361ee);
    border-color: rgba(114, 9, 183, 0.4);
    box-shadow: 
      var(--shadow-sm),
      inset 0 1px 0 rgba(255, 255, 255, 0.15),
      inset 0 -1px 0 rgba(90, 7, 146, 0.3);
  }
  
  .آکتینید { 
    background: linear-gradient(135deg, #f72585, #b5179e);
    border-color: rgba(247, 37, 133, 0.4);
    box-shadow: 
      var(--shadow-sm),
      inset 0 1px 0 rgba(255, 255, 255, 0.15),
      inset 0 -1px 0 rgba(197, 29, 106, 0.3);
  }
  
  .فلز, .شبه‌فلز { 
    background: linear-gradient(135deg, #06d6a0, #118ab2);
    border-color: rgba(6, 214, 160, 0.4);
    box-shadow: 
      var(--shadow-sm),
      inset 0 1px 0 rgba(255, 255, 255, 0.15),
      inset 0 -1px 0 rgba(5, 171, 128, 0.3);
  }
  
  .نافلز { 
    background: linear-gradient(135deg, #ffd166, #ef476f);
    border-color: rgba(255, 209, 102, 0.4);
    box-shadow: 
      var(--shadow-sm),
      inset 0 1px 0 rgba(255, 255, 255, 0.15),
      inset 0 -1px 0 rgba(204, 167, 82, 0.3);
  }
  
  .هالوژن { 
    background: linear-gradient(135deg, #ef476f, #ff6b35);
    border-color: rgba(239, 71, 111, 0.4);
    box-shadow: 
      var(--shadow-sm),
      inset 0 1px 0 rgba(255, 255, 255, 0.15),
      inset 0 -1px 0 rgba(191, 57, 89, 0.3);
  }
  
  .گاز-نجیب { 
    background: linear-gradient(135deg, #7209b7, #3a0ca3);
    border-color: rgba(114, 9, 183, 0.4);
    box-shadow: 
      var(--shadow-sm),
      inset 0 1px 0 rgba(255, 255, 255, 0.15),
      inset 0 -1px 0 rgba(90, 7, 146, 0.3);
  }

  .detail-panel {
    padding: var(--space-4);
    width: 92%;
    max-width: 340px;
    max-height: 75vh;
    border-radius: var(--border-radius-lg);
    background: rgba(15, 15, 25, 0.98);
    backdrop-filter: blur(30px) saturate(180%);
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 
      var(--shadow-lg),
      inset 0 1px 0 rgba(255, 255, 255, 0.08),
      0 0 0 1px rgba(255, 255, 255, 0.05);
    display: flex;
    flex-direction: column;
    overflow: hidden;
  }
  
  .detail-panel h2 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--space-3);
    text-align: center;
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-3));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: var(--font-weight-bold);
  }
  
  .detail-panel .element-info {
    padding: var(--space-3);
    margin-bottom: var(--space-3);
    background: rgba(255, 255, 255, 0.03);
    border-radius: var(--border-radius-md);
    border: 1px solid rgba(255, 255, 255, 0.06);
    flex: 1;
    overflow-y: auto;
    max-height: 200px;
  }
  
  .detail-panel p {
    margin: var(--space-2) 0;
    font-size: var(--font-size-xs);
    line-height: 1.3;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-1) 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  }
  
  .detail-panel strong {
    color: var(--color-accent);
    font-weight: var(--font-weight-semibold);
    min-width: 80px;
    font-size: var(--font-size-xs);
  }
  
  .detail-panel ul {
    padding-right: var(--space-4);
    margin-top: var(--space-1);
  }
  
  .detail-panel li {
    font-size: var(--font-size-xs);
    margin-bottom: var(--space-1);
    line-height: 1.2;
    padding-right: var(--space-1);
    color: rgba(255, 255, 255, 0.8);
  }

  .table-container::-webkit-scrollbar {
    height: 4px;
  }

  .table-container::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--border-radius-sm);
    margin: 0 var(--space-4);
  }

  .table-container::-webkit-scrollbar-thumb {
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-3));
    border-radius: var(--border-radius-sm);
    transition: none;
  }

  .table-container::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(135deg, var(--color-accent-light), var(--color-accent-3-light));
  }
}

/* mobile 480px */
@media (max-width: 480px) {
  :root {
    --element-size: 38px;
    --element-gap: 1.5px;
    --font-size-symbol: 0.78rem;
    --font-size-name: 0.32rem;
    --font-size-atomic: 0.42rem;
  }

  .site-header {
    padding: var(--space-2) var(--space-3);
  }
  
  .site-header .logo {
    font-size: var(--font-size-lg);
  }
  
  .logo-image {
    width: 28px;
    height: 28px;
  }
  
  .main-nav a {
    padding: var(--space-1) var(--space-2);
    font-size: var(--font-size-xs);
    min-width: 100px;
  }
  
  .search-overlay {
    padding: 0 var(--space-2);
    margin: var(--space-2) auto;
    top: 65px;
  }

  .search-box input {
    padding: var(--space-2) var(--space-3);
    font-size: var(--font-size-xs);
    padding-right: var(--space-8);
    padding-left: var(--space-8);
  }

  .search-box::before {
    right: var(--space-2);
    font-size: var(--font-size-sm);
  }

  .search-box button {
    left: var(--space-1);
    width: 28px;
    height: 28px;
    font-size: var(--font-size-base);
  }

  .detail-panel {
    padding: var(--space-3);
    max-width: 300px;
    max-height: 70vh;
  }
  
  .detail-panel h2 {
    font-size: var(--font-size-lg);
  }
  
  .detail-panel .element-info {
    max-height: 180px;
  }
} 

/* narrow 1024px */
@media (max-width: 1024px) and (orientation: landscape) {
  :root {
    --element-size: 36px;
    --element-gap: 2px;
  }

  .site-header {
    padding: var(--space-2) var(--space-3);
    flex-direction: row;
    justify-content: space-between;
  }
  
  .search-overlay {
    top: 50px;
  }

  .detail-panel {
    max-width: 320px;
    flex-direction: row;
    flex-wrap: wrap;
    max-height: 65vh;
  }
  
  .detail-panel .element-info {
    flex: 1;
    min-width: 180px;
    margin-right: var(--space-3);
    max-height: 150px;
  }
}
/* scroll hint */
.scroll-hint {
  display: block;
  text-align: center;
  font-size: var(--font-size-xs);
  color: var(--color-accent);
  padding: var(--space-2);
  opacity: 0.7;
  animation: none;
  margin-top: var(--space-1);
  width: 100%;
  background: linear-gradient(90deg, 
    transparent, 
    rgba(0, 212, 255, 0.06), 
    transparent);
  border-radius: var(--border-radius-md);
  border: 1px solid rgba(0, 212, 255, 0.1);
  font-weight: var(--font-weight-medium);
  backdrop-filter: blur(5px);
}

@keyframes hintPulse {
  0%, 100% { 
    opacity: 0.6;
    transform: translateX(0);
  }
  50% { 
    opacity: 0.9;
    transform: translateX(-5px);
  }
}

/* element cell */
.element-cell {
  -webkit-tap-highlight-color: rgba(0, 212, 255, 0.1);
  touch-action: manipulation;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}

.element-cell:active {
  opacity: 0.9;
  transform: none;
  transition: none;
}

/* table container */
.table-container {
  -webkit-overflow-scrolling: touch;
  scroll-behavior: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--color-accent) rgba(255, 255, 255, 0.05);
}

/* site footer */
.site-footer {
  padding: var(--space-4);
  margin-top: var(--space-3);
  font-size: var(--font-size-xs);
  background: rgba(255, 255, 255, 0.02);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.site-footer h4 {
  font-size: var(--font-size-base);
  margin-bottom: var(--space-1);
  color: var(--color-accent);
}

.site-footer p {
  font-size: var(--font-size-xs);
  margin: var(--space-1) 0;
  color: rgba(255, 255, 255, 0.6);
}

/* media */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
  .element-cell {
    border-width: 0.5px;
  }
  
  .logo-image {
    border-width: 1px;
  }
}

/* reduced motion */
@media (prefers-reduced-motion: reduce) {
  .element-cell,
  .element-cell::before,
  .logo-image,
  .main-nav a,
  .search-box button,
  .detail-panel #closeDetail {
    transition: none;
    animation: none;
  }
  
  .atom-nucleus,
  .atom-shell,
  .atom-electron {
    animation: none;
  }
}


/* system theme */
@media (prefers-color-scheme: dark) {
  body:not(.light-theme) .site-header {
    background: rgba(10, 10, 15, 0.95);
  }

  body:not(.light-theme) .search-overlay {
    background: rgba(15, 15, 25, 0.95);
  }
}

/* light theme */
body.light-theme .search-overlay {
  background: rgba(248, 250, 255, 0.95);
  border-bottom-color: rgba(18, 22, 48, 0.1);
}

/* search box */
body.light-theme .search-box input {
  background: #fff;
  border-color: rgba(18, 22, 48, 0.14);
  color: var(--color-text);
}

body.light-theme .search-box::before {
  color: rgba(18, 22, 48, 0.5);
}

/* detail panel */
body.light-theme .detail-panel .element-info {
  background: rgba(18, 22, 48, 0.03);
  border-color: rgba(18, 22, 48, 0.08);
}

body.light-theme .detail-panel li {
  color: rgba(20, 26, 56, 0.78);
}

/* table container */
body.light-theme .table-container {
  scrollbar-color: var(--color-accent) rgba(18, 22, 48, 0.06);
}

body.light-theme .table-container::-webkit-scrollbar-track {
  background: rgba(18, 22, 48, 0.06);
}

/* site footer */
body.light-theme .site-footer {
  background: rgba(18, 22, 48, 0.03);
  border-top-color: rgba(18, 22, 48, 0.08);
}

/* print */
@media print {
  .site-header,
  .search-overlay,
  .site-footer {
    display: none;
  }
  
  .table-container {
    overflow: visible;
  }
  
  .element-cell {
    break-inside: avoid;
    box-shadow: none;
    border: 1px solid #000;
  }
}