/* ========= CSS (All UI Refinements - May 27, 2025) ========= */
:root {
  --primary-color: #007bff;
  --primary-hover: #0056b3;
  --secondary-color: #28a745;
  --border-color: #d1d5db;
  --background-light: #f9fafb;
  --unified-background: #f3f4f6;
  --text-dark: #1f2937;
  --text-light: #ffffff;
  --highlight-color-white-key: rgba(
    59,
    130,
    246,
    0.5
  ); /* 50% opacity blue for white keys */
  --highlight-color-black-key: #a0c4ff; /* Solid light blue for black keys */
  --piano-shadow-color: rgba(0, 100, 200, 0.3); /* More dramatic blue shadow */
  --felt-red-color: #b90000; /* Slightly richer red */
  --input-width-default: 90px; /* Default narrower width */
  --input-width-wider: 160px; /* Wider for specific inputs (Tempo, Rhythm Pattern) */
}
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica,
    Arial, sans-serif;
  padding: 20px;
  background: #fff;
  color: var(--text-dark);
  line-height: 1.6;
  margin: 0;
}
main {
  max-width: 1200px;
  margin: 0 auto;
}
header {
  text-align: center;
  margin-bottom: 1.5rem;
}
h1 {
  font-size: 2.2rem;
  color: var(--text-dark);
  margin-top: 0;
}
hr {
  margin: 1.5rem 0;
  border: 0;
  border-top: 1px solid var(--border-color);
}

.unified-content-area {
  background-color: var(--unified-background);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}
#scale-visualizer-and-controller,
#exercise-matrix-section {
  margin-bottom: 0;
  padding: 0;
  background-color: transparent;
  border: none;
}
#exercise-matrix-section {
  margin-top: 1.5rem;
}
section#practice-tracker {
  margin-bottom: 1.5rem;
  padding: 1.5rem;
  background-color: var(--background-light);
  border: 1px solid var(--border-color);
  border-radius: 8px;
}
h2 {
  font-size: 1.5rem;
  color: var(--text-dark);
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.5rem;
  margin-bottom: 1rem;
  margin-top: 0;
}
h3 {
  font-size: 1.2rem;
  margin-top: 1.5rem;
}

label {
  font-weight: 500;
  margin-right: 0.5rem;
  display: inline-block;
  margin-bottom: 0.25rem;
}
select,
input[type="text"],
input[type="date"],
input[type="number"],
button,
textarea {
  padding: 10px;
  margin: 0 5px 10px 0;
  border-radius: 5px;
  border: 1px solid var(--border-color);
  font-size: 15px;
  box-sizing: border-box;
  vertical-align: middle;
}
button {
  cursor: pointer;
  border: none;
  transition: background-color 0.2s, color 0.2s, border-color 0.2s;
  padding: 10px 15px;
  font-weight: 500;
}
.btn-solid {
  background-color: var(--primary-color);
  color: var(--text-light);
  border: 2px solid var(--primary-color);
}
.btn-solid:hover {
  background-color: var(--primary-hover);
  border-color: var(--primary-hover);
}
.btn-outline {
  background-color: transparent;
  color: var(--primary-color);
  border: 2px solid var(--primary-color);
}
.btn-outline:hover {
  background-color: var(--primary-color);
  color: var(--text-light);
}
.btn-small {
  padding: 6px 12px;
  font-size: 0.9em;
}

.controls {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}
.control-row {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  justify-content: center;
}
.control-row.button-row {
  justify-content: center;
  width: 100%;
  margin-top: 0.5rem;
}
.controls label {
  margin-right: 0.25rem;
}
.controls select {
  margin-right: 1rem;
}

.form-group {
  margin-bottom: 1rem;
}
.form-group label {
  display: block;
}
.form-group input,
.form-group textarea {
  width: 100%;
  max-width: 450px;
}

/* === Replace ALL your existing piano-related CSS (from #piano-wrapper down) with this block === */
#piano-wrapper { 
    display: flex; 
    flex-direction: column; 
    align-items: center; /* This centers the felt line and piano container */
    margin-bottom: 1rem; 
}

.piano-felt-line {
  height: 5px;
  background-color: var(--felt-red-color, #b90000);
  width: 952px; /* Based on 19 keys * 50px + 2px for container border */
  margin-bottom: 0px;
  border-radius: 2px 2px 0 0;
}

#piano-container {
  position: relative; 
  display: flex;     
  height: 180px;
  width: 950px; /* EXACT width of 19 * 50px keys */
  padding: 0;
  border-radius: 0 0 5px 5px;
  border: 1px solid #999; /* This border adds to the overall visual width */
  border-top: none; 
  box-shadow: 0 6px 12px -2px var(--piano-shadow-color, rgba(0, 100, 200, 0.3));
  background-color: transparent;
}
.key { 
  border: 1px solid #555; 
  box-sizing: border-box; 
  border-radius: 0 0 3px 3px;
  transition: all 0.1s ease-in-out;
}

/* White key width is definitive */
.key.white {
  height: 100%;
  width: 50px; 
  background-color: white;
  z-index: 1;
  border: 1px solid #555; /* Each key has its border */
  box-sizing: border-box; /* Width includes border */
}
.key.black {
  position: absolute;
  height: 60%; /* Approx 2/3 height of white keys */
  width: 30px;  /* Standard black key width */
  background-color: #222;
  z-index: 2;
  margin-left: -15px; /* Pulls back by half its width to center over "crack" */
  border-bottom-width: 0; /* No bottom border for black keys */
  box-shadow: 0 1px 1px rgba(0,0,0,0.3) inset, 0 -1px 0px rgba(255,255,255,0.1) inset;
}

/* Positioning for each black key: 'left' positions its left edge at the right edge of the preceding white key */
/* Octave 3 Black Keys (relative to B2 being the first white key) */
/* B2 is white key 1 (index 0). C3 is white key 2 (index 1). */
.key[data-note="C#3"] { left: calc(50px * 2); }  /* After C3 (2nd white key overall) */
.key[data-note="D#3"] { left: calc(50px * 3); }  /* After D3 (3rd white key overall) */
.key[data-note="F#3"] { left: calc(50px * 5); }  /* After F3 (5th white key overall) */
.key[data-note="G#3"] { left: calc(50px * 6); }  /* After G3 (6th white key overall) */
.key[data-note="A#3"] { left: calc(50px * 7); }  /* After A3 (7th white key overall) */

/* Octave 4 Black Keys */
/* B3 is white key 8. C4 is white key 9. */
.key[data-note="C#4"] { left: calc(50px * 9); }  /* After C4 */
.key[data-note="D#4"] { left: calc(50px * 10); } /* After D4 */
.key[data-note="F#4"] { left: calc(50px * 12); } /* After F4 */
.key[data-note="G#4"] { left: calc(50px * 13); } /* After G4 */
.key[data-note="A#4"] { left: calc(50px * 14); } /* After A4 */

/* Octave 5 Black Keys */
/* B4 is white key 15. C5 is white key 16. */
.key[data-note="C#5"] { left: calc(50px * 16); } /* After C5 */
.key[data-note="D#5"] { left: calc(50px * 17); } /* After D5 */
/* E5 and F5 have no black keys immediately following in this range */


.key.white.highlighted {
  background-color: var(--highlight-color-white-key, rgba(59, 130, 246, 0.5));
}

.key.black.highlighted {
  background-color: var(
    --primary-hover,
    #0056b3
  ); /* Solid darker blue background */
  border: 1px solid var(--primary-color, #007bff); /* A slightly brighter blue border to make it pop */
  box-shadow: 0 0 7px var(--primary-color, #007bff); /* A subtle glow of the primary blue */
  /* The original inset shadow for depth is removed as the background color change is the primary indicator */
}
/* === End of piano-related CSS block === */

#scale-name-display {
  text-align: center;
  margin-top: 1rem;
  font-size: 1.2em;
  font-weight: bold;
  min-height: 1.5em;
}

#table-wrapper {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--border-color);
  border-radius: 5px;
}
table {
  width: 100%;
  border-collapse: collapse;
}
th,
td {
  padding: 10px 8px;
  border: 1px solid var(--border-color);
  text-align: left;
  vertical-align: middle;
}
/* ADD THIS NEW RULE FOR HEADER ALIGNMENT */
thead tr:first-child th[rowspan="2"] {
  vertical-align: bottom;
  padding-bottom: 8px; /* You can adjust this padding value */
  text-align: left; /* Override the general center alignment if needed for these specific cells */
}

/* You might also want to ensure the colspan header is centered if it wasn't already */
thead tr:first-child th[colspan="2"] {
  text-align: center;
}
th {
  background-color: #e9ecef;
  white-space: nowrap;
}
td {
  background-color: white;
}

td select,
td input[type="text"],
td input[type="number"] {
  width: var(--input-width-default);
  min-width: var(--input-width-default);
}
/* Headers: Exercise(1), Tempo(2), Metronome_Click(3), Metronome_BPM(4), Rhythm Pattern(5), Subdivision(6), Time(7), Action(8) */
td:nth-child(2) select, /* Tempo */
td:nth-child(5) select  /* Rhythm Pattern */ {
  width: var(--input-width-wider);
  min-width: var(--input-width-wider);
}
/* ADD OR MODIFY these rules */
td:nth-child(2) select, /* Tempo */
td:nth-child(5) select, /* Rhythm Pattern */
td:nth-child(6) select  /* Subdivision */ {
  width: var(--input-width-wider, 170px);
  min-width: var(--input-width-wider, 170px);
  vertical-align: middle; /* Explicitly set for the select itself */
  /* You can try removing margin-top/bottom if they exist or setting them to 0 */
  margin-top: 0;
  margin-bottom: 0;
}
/* MODIFIED .time-input-cell and supporting rules */
.time-input-cell {
  display: flex; /* Use flexbox for alignment of contents */
  align-items: center; /* Vertically center the items (hour select, colon, minute select) */
  justify-content: flex-start; /* Align items to the start of the cell */
  white-space: nowrap; /* Keep items on one line */
  /* REMOVE explicit padding-top, padding-bottom, padding-left, padding-right from here. 
       It will inherit the default 'td' padding: 10px 8px; 
    */
}

.time-input-cell select {
  width: auto;
  min-width: 55px;
  margin: 0 3px;
  padding: 6px 5px; /* SLIGHTLY REDUCED internal padding for the select boxes themselves */
  font-size: 15px;
  /* vertical-align: middle; -- Not usually needed when parent is flex and align-items: center */
}

.time-colon {
  font-weight: bold;
  margin: 0 1px;
  padding: 5px 0; /* Add some padding to match select box effective height better */
  /* vertical-align: middle; -- Not usually needed */
  line-height: 3;
}

/* Exercise column: remove min-width to make it as narrow as content allows */
th:first-child,
td:first-child {
  min-width: auto;
  width: auto;
  white-space: normal;
}
.exercise-key-name {
  font-size: 0.9em;
  color: #555;
  display: block;
  line-height: 1.2;
}
.exercise-template-name {
  font-size: 1em;
  font-weight: 500;
  display: block;
  line-height: 1.2;
}
.exercise-parenthetical {
  font-size: 0.8em;
  color: #777;
  display: block;
  font-style: italic;
  line-height: 1.2;
}

.exercise-name {
  cursor: pointer;
}

.history-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 1.5rem;
}
.history-header h3 {
  margin: 0;
}
#practice-history {
  list-style-type: none;
  padding-left: 0;
  margin-top: 0.5rem;
}
#practice-history li {
  background-color: #fff;
  padding: 10px;
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--primary-color);
  margin-bottom: 8px;
  border-radius: 4px;
  position: relative;
}
.delete-log-btn {
  position: absolute;
  top: 50%;
  right: 8px;
  transform: translateY(-50%);
  background: transparent;
  border: none;
  color: #cc0000;
  font-size: 1.5em;
  cursor: pointer;
  padding: 0px 5px;
  line-height: 1;
}
.delete-log-btn:hover {
  color: #ff0000;
  font-weight: bold;
}