style.css

/* Import Roboto weights */
@import url('https://fonts.googleapis.com/css2?family=Roboto:wght@300;400;500;700&display=swap');

:root {
    --bg-main: #2C3333; /* Deep, desaturated teal-ish grey */
    --bg-panel: #393E46; /* Slightly lighter, warmer grey */
    --text-primary: #E0E0E0; /* Off-white */
    --text-secondary: #B0B0B0; /* Lighter grey for labels, muted text */
    --accent-primary: #76ABAE; /* Soft, muted teal */
    --accent-primary-hover: #8bc1c4; /* Lighter teal for hover */
    --accent-active: #A2D2D2; /* Even lighter for active states or highlights */
    --border-color: #4A505A; /* Subtle border color */
    --input-bg: #2a2a3e; /* Kept similar for now, could be --bg-main slightly lighter */
    --button-remove-bg: #E07A5F; /* Muted red for remove/delete */
    --button-remove-hover: #d96a4f;
    --button-action-bg: #76ABAE; /* Accent for primary actions (add layer) */
    --button-action-hover: #8bc1c4;
    --button-secondary-bg: #4F5660; /* For general buttons (save, load) */
    --button-secondary-hover: #606770;
    --button-tertiary-bg: #40464E; /* For less prominent actions like Fill/Clear */
    --button-tertiary-hover: #505760;
    --button-mute-solo-active: #F4D06F; /* Muted yellow for active mute/solo */
    --button-mute-solo-active-hover: #e9c46a;
    --font-family-main: 'Roboto', sans-serif;
}

body, html {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    background-color: var(--bg-main);
    color: var(--text-primary);
    font-family: var(--font-family-main);
    font-weight: 400; /* Regular weight as base */
}

#app-container {
    width: 100%;
    height: 100%;
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

#rhythmCanvas {
    display: block;
    background-color: transparent;
}

/* --- Menu Icon (Hamburger) --- */
.menu-icon {
    position: absolute;
    top: 20px;
    left: 20px;
    width: 30px;
    height: 22px;
    cursor: pointer;
    z-index: 1001;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.menu-icon span {
    display: block;
    width: 100%;
    height: 3px; /* Slightly thicker for better visibility */
    background-color: var(--accent-primary);
    border-radius: 3px;
    transition: all 0.3s ease-in-out;
}

.menu-icon.open span:nth-child(1) {
    transform: translateY(9.5px) rotate(45deg);
}
.menu-icon.open span:nth-child(2) {
    opacity: 0;
}
.menu-icon.open span:nth-child(3) {
    transform: translateY(-9.5px) rotate(-45deg);
}

/* --- Controls Panel --- */
.controls-panel {
    position: absolute;
    top: 0;
    left: -360px; /* Slightly wider panel */
    width: 350px;  /* Slightly wider panel */
    height: 100%;
    background-color: var(--bg-panel);
    backdrop-filter: blur(3px); /* Softer blur */
    padding: 5px; /* More padding */
    box-shadow: 4px 0 12px rgba(0, 0, 0, 0.3); /* Softer shadow */
    transition: left 0.35s ease-in-out;
    z-index: 1000;
    overflow-y: auto;
    color: var(--text-primary);
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
}

.controls-panel.open {
    left: 0;
}

.controls-panel h2 {
    color: var(--text-primary);
    font-family: var(--font-family-main);
    font-weight: 500; /* Medium weight for main title */
    font-size: 1.8em; /* Larger main title */
    margin-top: 0;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 15px;
    margin-bottom: 20px;
}
.controls-panel h3 {
    color: var(--accent-primary);
    font-family: var(--font-family-main);
    font-weight: 400; /* Regular weight */
    font-size: 1.3em;
    margin-top: 25px;
    margin-bottom: 15px;
    text-align: left; /* Align section headers left */
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-color);
}

.control-group {
    margin-bottom: 18px; /* Increased spacing */
}

.control-group label {
    display: block;
    margin-bottom: 8px; /* Increased spacing */
    font-size: 0.9em;
    color: var(--text-secondary);
    font-weight: 300; /* Lighter weight for labels */
}

.control-group input[type="number"],
.control-group input[type="text"],
.control-group select {
    width: 100%; /* Simpler width calculation */
    padding: 10px; /* More padding */
    background-color: var(--input-bg);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-radius: 5px; /* Slightly more rounded */
    box-sizing: border-box;
    font-size: 0.95em;
}
.control-group input[type="color"] {
    width: 100%;
    height: 35px; /* Taller color input */
    padding: 0;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    cursor: pointer;
    -webkit-appearance: none; /* Try to remove default styling */
    -moz-appearance: none;
    appearance: none;
    background-color: transparent; /* Make custom styling more visible */
}
/* For Webkit browsers to style the color swatch */
.control-group input[type="color"]::-webkit-color-swatch-wrapper {
    padding: 0;
}
.control-group input[type="color"]::-webkit-color-swatch {
    border: none;
    border-radius: 4px;
}

.control-group.pattern-management {
    display: grid;
    grid-template-columns: 1fr 1.5fr 1fr 1fr; /* Adjust column widths */
    gap: 8px;
    align-items: center;
}
.control-group.pattern-management select {
    width: 100%;
}

.control-group.pattern-io {
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.control-group.pattern-io button {
    width: 100%;
}
.control-group.pattern-io input[type="file"] {
    font-size: 0.85em;
    padding: 8px;
}
.file-upload-label {
    font-size: 0.9em;
    color: var(--text-secondary);
    font-weight: 300;
    margin-bottom: 6px !important; /* Override general label margin */
    display: block;
}


button {
    padding: 10px 15px;
    color: var(--text-primary);
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.2s ease, transform 0.1s ease;
    font-family: var(--font-family-main);
    font-weight: 400;
    background-color: var(--button-secondary-bg);
}
button:hover {
    background-color: var(--button-secondary-hover);
}
button:active {
    transform: translateY(1px); /* Subtle press effect */
}

button#addLayerBtn {
    background-color: var(--button-action-bg);
    width: 100%;
}
button#addLayerBtn:hover {
    background-color: var(--button-action-hover);
}
button.remove-layer-btn {
    background-color: var(--button-remove-bg);
    padding: 6px 10px;
    font-size: 0.85em;
}
button.remove-layer-btn:hover {
    background-color: var(--button-remove-hover);
}

hr {
    border: none;
    border-top: 1px solid var(--border-color);
    margin: 25px 0; /* More spacing */
}

.layer-item {
    background-color: rgba(0,0,0,0.1); /* Darker, more subtle item background */
    padding: 15px;
    margin-bottom: 15px;
    border-radius: 6px;
    border-left: 4px solid var(--accent-primary);
}
.layer-item .control-group {
    margin-bottom: 12px;
}

.layer-elements-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}
.layer-elements-header label {
    margin-bottom: 0; /* Remove margin as it's handled by parent */
    font-weight: 400; /* Make it a bit bolder than other labels */
    color: var(--text-primary);
}
.layer-element-quick-actions {
    display: flex;
    gap: 6px;
}
.layer-element-quick-actions button {
    padding: 4px 8px;
    font-size: 0.75em;
    background-color: var(--button-tertiary-bg);
}
.layer-element-quick-actions button:hover {
    background-color: var(--button-tertiary-hover);
}


.layer-elements {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 8px;
}

.layer-elements button {
    min-width: 32px; /* Slightly larger */
    padding: 6px;
    background-color: var(--button-secondary-bg);
    border: 1px solid var(--border-color);
    font-size: 0.9em;
}
.layer-elements button.active {
    /* background-color: var(--accent-primary); */ /* Will be set by inline style */
    /* color: var(--bg-main); */ /* Will be set by inline style for contrast */
    /* border-color: var(--accent-primary-hover); */ /* Will be set by inline style to match background */
    font-weight: 500;
}

.layer-elements button.popping {
    transform: scale(1.15);
    background-color: var(--accent-active); /* Brighter color for pop */
    transition: transform 0.05s ease-out, background-color 0.05s ease-out;
}


#fullscreenBtn, button#muteAllBtn {
    width: 100%;
    background-color: var(--button-secondary-bg);
    margin-top: 10px; /* Spacing between them */
}
#fullscreenBtn:hover, button#muteAllBtn:hover {
    background-color: var(--button-secondary-hover);
}

button#muteAllBtn.active {
    background-color: var(--button-remove-bg);
    color: var(--text-primary);
}
button#muteAllBtn.active:hover {
    background-color: var(--button-remove-hover);
}

/* Style for the new Play/Stop button */
button#playStopBtn {
    width: 100%;
    background-color: var(--button-action-bg); /* Using action color for "Play" */
}
button#playStopBtn:hover {
    background-color: var(--button-action-hover);
}
button#playStopBtn.active {
    background-color: var(--accent-active); /* A distinct color for "Stop" (playing state) */
    color: var(--bg-main); /* Ensure contrast for active state */
}
button#playStopBtn.active:hover {
    background-color: var(--accent-primary); /* Slightly different hover for active state */
}


/* --- Mute/Solo Button Styles --- */
.layer-actions {
    display: flex;
    gap: 10px;
    margin-top: 12px;
    margin-bottom: 12px;
}
.layer-actions button {
    flex-grow: 1;
    padding: 8px 10px;
    font-size: 0.9em;
    background-color: var(--button-secondary-bg);
}

button.mute-layer-btn.active,
button.solo-layer-btn.active {
    background-color: var(--button-mute-solo-active);
    color: var(--bg-main); /* Dark text */
    font-weight: 500;
}
button.mute-layer-btn.active:hover,
button.solo-layer-btn.active:hover {
    background-color: var(--button-mute-solo-active-hover);
}

/* --- Tab Styles --- */
.tabs-nav {
    display: flex;
    margin-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
}

.tab-button {
    padding: 12px 18px; /* More padding */
    cursor: pointer;
    background-color: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 1em;
    font-family: var(--font-family-main);
    font-weight: 400; /* Regular weight */
    flex-grow: 1;
    text-align: center;
    border-bottom: 3px solid transparent;
    transition: color 0.2s ease, border-color 0.2s ease;
    outline: none;
}
.tab-button:hover {
    color: var(--accent-primary-hover);
    /* background-color: rgba(0,0,0,0.05); */ /* Subtle hover on tab */
}
.tab-button.active {
    color: var(--accent-primary);
    font-weight: 500; /* Medium weight for active tab */
    border-bottom-color: var(--accent-primary);
}

.tabs-content-container {
    flex-grow: 1;
    overflow-y: auto;
    padding: 10px;
}

.tab-content {
    display: none;
    padding-top: 5px; /* Less padding, headers have margin now */
}
.tab-content.active {
    display: block;
}

/* Ensure last items in panel are visible */
.controls-panel > button:last-child {
    margin-top: auto; /* Pushes fullscreen to bottom if panel is flex-column */
    margin-bottom: 5px; /* ensure some space at the very bottom */
}
.controls-panel > hr:nth-last-of-type(2) { /* The HR before Mute All button */
    margin-top: auto; /* Help push Mute All and Fullscreen down */
}

/* --- Hyperlink Styles --- */
a {
    color: var(--accent-primary);
    text-decoration: none;
    transition: color 0.2s ease, text-decoration 0.2s ease;
}

a:hover {
    color: var(--accent-primary-hover);
    text-decoration: underline;
}

a:active {
    color: var(--accent-active);
}


/* Scrollbar styling for a more modern look (Webkit) */
.controls-panel::-webkit-scrollbar,
.tabs-content-container::-webkit-scrollbar {
    width: 4px;
}
.controls-panel::-webkit-scrollbar-track,
.tabs-content-container::-webkit-scrollbar-track {
    background: rgba(0,0,0,0.1);
    border-radius: 4px;
}
.controls-panel::-webkit-scrollbar-thumb,
.tabs-content-container::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}
.controls-panel::-webkit-scrollbar-thumb:hover,
.tabs-content-container::-webkit-scrollbar-thumb:hover {
    background: var(--accent-primary);
}

/* --- Shortcuts Help Icon --- */
#shortcuts-help-btn {
    position: absolute;
    top: 20px;
    right: 20px;
    width: 30px;
    height: 30px;
    background-color: rgba(var(--accent-primary-rgb, 76, 171, 174), 0.5); /* Use accent with alpha or a specific color */
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    font-size: 18px;
    font-weight: bold;
    line-height: 28px; /* Adjust for vertical centering */
    text-align: center;
    cursor: pointer;
    z-index: 1001;
    transition: background-color 0.2s ease, transform 0.1s ease;
    padding: 0; /* Remove default button padding */
}

#shortcuts-help-btn:hover {
    background-color: var(--accent-primary); /* Solid on hover */
    transform: scale(1.1);
}

/* --- Shortcuts Modal --- */
.shortcuts-modal {
    display: none; /* Hidden by default */
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6); /* Darker overlay */
    z-index: 2000;
    justify-content: center;
    align-items: center;
    backdrop-filter: blur(3px);
    padding: 20px; /* Added padding for space around the content */
    box-sizing: border-box; /* Ensure padding is included in width/height */
}

.shortcuts-modal-content {
    background-color: var(--bg-panel);
    padding: 25px 30px;
    border-radius: 8px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.4);
    width: 90vw; /* Responsive width */
    min-width: 300px; /* Adjusted min-width */
    max-width: 500px;
    color: var(--text-primary);
    position: relative; /* For close button positioning */
    max-height: 90vh; /* Maximum height */
    overflow-y: auto; /* Enable vertical scrolling */
}

.shortcuts-modal-close {
    position: absolute;
    top: 10px;
    right: 15px;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    padding: 5px;
    line-height: 1;
}
.shortcuts-modal-close:hover {
    color: var(--text-primary);
}

.shortcuts-modal-content h3 {
    color: var(--accent-primary);
    margin-top: 0;
    margin-bottom: 10px;
    text-align: center;
    font-size: 1.5em;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 10px;
}

.shortcuts-modal-content p.shortcuts-modal-info {
    font-size: 0.85em;
    color: var(--text-secondary);
    margin-bottom: 15px;
    text-align: center;
}

.shortcuts-modal-content ul {
    list-style-type: none;
    padding: 0;
    margin: 0;
}

.shortcuts-modal-content li {
    font-size: 0.95em;
    margin-bottom: 10px;
    padding-left: 15px;
    position: relative;
}

.shortcuts-modal-content li::before {
    content: "•"; /* Bullet point */
    color: var(--accent-primary);
    font-weight: bold;
    display: inline-block;
    position: absolute;
    left: 0;
    top: 0;
}

.shortcuts-modal-content li strong {
    color: var(--accent-active);
    font-weight: 500;
}