* {
  margin: 0;
  padding: 0;
  border: 0;
  font-family: "Pixelify Sans", sans-serif;
  box-sizing: border-box;
}

html,
body {
  overflow: hidden;
}

:root {
  --canvas-bg: #eafbff;
  --panel-bg: rgba(255, 255, 255, 0.8);
  --panel-shadow: 1px 1px 10px rgba(0, 0, 0, 0.1);
  --text-color: #555555;
  --hover-bg: rgba(0, 0, 0, 0.08);
  --active-bg: rgba(0, 0, 0, 0.18);
  --range-track: #ddd;
  --range-thumb: #2b384c;
  --input-border: #ddd;
  --shortcut-info: #555555;
}

body[data-theme="dark"] {
  --canvas-bg: #eafbff;
  --panel-bg: rgba(20, 25, 33, 0.88);
  --panel-shadow: 1px 1px 10px rgba(0, 0, 0, 0.35);
  --text-color: #d4d4d4;
  --hover-bg: rgba(255, 255, 255, 0.12);
  --active-bg: rgba(255, 255, 255, 0.2);
  --range-track: #4f5f78;
  --range-thumb: #e0e8f5;
  --input-border: #4f5f78;
  --shortcut-info: #555555;
}

#canvas {
  background: var(--canvas-bg);
  touch-action: none;
  /* prevents scroll for phones  */
  width: 100%;
  height: 100vh;
  display: block;
}

/* shared button style (top bar buttons + fill buttons + layer up down) */
button,
.fill-btn {
  padding: 0.5rem 0.6rem;
  border-radius: 0.4rem;
  background: transparent;
  color: var(--text-color);
  border: 1px solid var(--input-border);
  cursor: pointer;
  transition: 0.1s;
}

button:hover,
.fill-btn:hover {
  background: var(--hover-bg);
}

button:active,
.fill-btn:active {
  background: var(--active-bg);
}

.top-bar {
  position: fixed;
  top: 0.5%;
  left: 0.3%;
  width: 99.4%;
  height: 6.5%;

  display: flex;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 0.5rem;
  align-items: center;

  color: var(--text-color);
  background: var(--panel-bg);
  border-radius: 0.6rem;

  border: 1.8px solid var(--input-border);
  box-shadow: var(--panel-shadow);
}

.top-bar svg {
  width: 1.2rem;
  height: 1.2rem;
}

.sidebar {
  position: fixed;
  left: 0.3%;
  top: 7.4%;
  height: 91%;
  width: 16vw;

  min-width: 200px;

  display: flex;
  flex-direction: column;
  gap: 0.2rem;

  overflow-y: auto;
  /* scroll */

  padding: 1.2rem;
  padding-top: 0.4rem;

  color: var(--text-color);
  background: var(--panel-bg);
  backdrop-filter: blur(10px);

  border: 1.8px solid var(--input-border);
  border-radius: 0.8rem;
  box-shadow: var(--panel-shadow);
}

.section-heading {
  font-size: 0.8rem;
  margin-bottom: 0.6rem;
  margin-top: 0.8rem;
}

.sidebar-tools {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.tool-btn {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 0.6rem;

  padding: 0.5rem 0 0.5rem 0.2rem;
  min-width: 1.4rem;
  min-height: 1.4rem;

  border-radius: 0.3rem;
  background: transparent;
  cursor: pointer;
}

.tool-btn svg {
  width: 1.2rem;
  height: 1.2rem;
}

.tool-btn p {
  font-size: 0.8rem;
  color: var(--text-color);
}

.tool-btn:hover {
  background: var(--hover-bg);
}

input:checked+.tool-btn {
  background: var(--active-bg);
}

.sidebar-color {
  display: flex;
  gap: 0.8rem;
  align-items: center;
  margin-bottom: 0.1rem;

}

#color-selector {
  width: 36px;
  height: 36px;
  border: 1.5px solid var(--input-border);
  border-radius: 8px;
  padding: 0;
  cursor: pointer;
}

#color-selector::-webkit-color-swatch-wrapper {
  padding: 0;
}

.color-display {
  user-select: none;
}

.fill-selector {
  display: flex;
  gap: 0.5rem;
}

.fill-btn {
  flex: 1;
  text-align: center;
  padding: 0.4rem 0;
}

input:checked+.fill-btn {
  background: var(--active-bg);
}

.width-slider,
.opacity-slider {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

input[type="range"] {
  width: 100%;
  height: 0.5rem;
  border-radius: 2px;
  background: var(--range-track);
  accent-color: var(--range-thumb);
  margin-bottom: 0.2rem;
}

body[data-theme="dark"] svg {
  filter: invert(1);
}

#layer-control {
  display: flex;
  gap: 1rem;
}

.layer svg {
  width: 1.2rem;
  height: 1.2rem;
}

.layer {
  padding: 0.5rem 0.5rem 0.22rem 0.5rem;
  border-radius: 0.4rem;
  background: transparent;
  color: var(--text-color);
  border: 1px solid var(--input-border);
  cursor: pointer;
  transition: 0.1s;
}

@media (max-height: 800px) {
  .sidebar {
    gap: 0;
    padding: 0.3rem 1.2rem;
  }

  .section-heading {
    margin-top: 0.5rem;
    margin-bottom: 0.3rem;
  }

  .tool-btn {
    padding: 0.35rem 0 0.35rem 0.2rem;
  }

  .width-slider,
  .opacity-slider {
    gap: 0.3rem;
  }

  input[type="range"] {
    margin-bottom: 0.1rem;
  }

  #color-selector {
    width: 30px;
    height: 30px;
  }
}

/* fallback */
@media (max-height: 660px) {
  .sidebar {
    padding: 0.15rem 1.2rem;
  }

  .section-heading {
    font-size: 0.7rem;
    margin-top: 0.2rem;
    margin-bottom: 0.1rem;
  }

  .tool-btn {
    padding: 0.2rem 0 0.2rem 0.2rem;
    min-height: 0;
  }

  .tool-btn p {
    font-size: 0.75rem;
  }

  input[type="range"] {
    height: 0.35rem;
    margin-bottom: 0;
  }

  .width-slider,
  .opacity-slider {
    gap: 0.15rem;
  }

  .sidebar-color {
    margin-bottom: 0;
  }

  #color-selector {
    width: 1.5rem;
    height: 1.5rem;
  }

  #layer-control {
    gap: 0.3rem;
  }
}

.shortcut-info {
  position: fixed;
  bottom: 0.6rem;
  right: 1%;
  font-size: 0.8rem;
  color: var(--shortcut-info);
}

#title {
  font-size: 1.5rem;
  font-weight: 100;
  margin-left: 0.4rem;
}

.nav-right {
  display: flex;
  gap: 0.3rem;
}

.fill-section {
  display: none;
}

@media (max-width: 600px) {

  .sidebar {
    top: 4rem;
    width: 2.6rem;
    min-width: 0;
    padding: 0.4rem 0.2rem;
    align-items: center;
    height: fit-content;

    overflow: visible;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    /* allow footer to leave the sidebar */
  }

  .sidebar-tools {
    gap: 0.4rem
  }

  .tool-btn {
    width: 1.6rem;
    height: 1.6rem;
    padding: 0;
    display: flex;
    align-items: center;

    justify-content: center;
    border: 1px solid var(--input-border);
    border-radius: 0.5rem;
  }

  .tool-btn svg {
    width: 1.15rem;
    height: 1.15rem;
  }

  .tool-btn p {
    display: none;
  }

  .sidebar-tools {
    align-items: center;
  }

  .layer {
    width: 1.6rem;
    height: 1.6rem;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
  }

  #layer-control {
    flex-direction: column;
    align-items: center;
    gap: 0.3rem;
    margin-top: 0;
  }

  .section-heading {
    display: none;
  }

  .width-and-opacity .section-heading {
    display: block;
    font-size: 0.65rem;
  }

  #fill-selector {
    display: flex;
    justify-content: center;
  }

  .fill-selector {
    display: flex;
    flex-direction: column;
    gap: 0.1rem;
    font-size: 0.7rem;
  }

  .sidebar-color {
    margin-bottom: 0;
    margin-top: 0.35rem;
    margin-bottom: 0.4rem;
  }

  #color-selector {
    width: 1.5rem;
    height: 1.5rem;
  }

  .top-bar {
    height: 3.6rem;
  }

  .shortcut-info {
    display: none;
  }

  .text-tool {
    display: none;
  }

  .width-and-opacity {
    position: fixed;
    bottom: 0.5dvh;
    left: 0.2rem;
    right: 0.2rem;

    display: flex;
    align-items: center;
    gap: 1rem;

    padding: 0.4rem 0.8rem;
    border-radius: 0.8rem;

    background: var(--panel-bg);
    border: 1px solid var(--input-border);
    box-shadow: var(--panel-shadow);
  }

  .width-slider,
  .opacity-slider {
    flex: 1;
  }
}