/*=============================================
  IMPORTS & GLOBAL VARIABLES
=============================================*/
@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700&display=swap');

:root {
    /* --- Color Palette (Dark Mode) --- */
    --bg-primary: #0f0f1a;
    --bg-secondary: #1a1a2e;
    --bg-element: #262639;
    --bg-interactive: #3a3a50;
    --bg-interactive-rgb: 58, 58, 80;
    --accent-primary: #8c5eff;
    --accent-secondary: #ff67d7;
    --text-primary: #ffffff;
    --text-secondary: #b8b8d0;
    --border-color: #40405a;
    --error-color: #ff4757;
    --success-color: #2ecc71;

    /* --- RGB Components for rgba() usage --- */
    --bg-primary-rgb: 15, 15, 26;
    --bg-secondary-rgb: 26, 26, 46;
    --accent-primary-rgb: 140, 94, 255;
    --accent-secondary-rgb: 255, 103, 215;
    --text-primary-rgb: 255, 255, 255;
    --error-color-rgb: 255, 71, 87;
    --success-color-rgb: 46, 204, 113;


    /* --- Sizing & Effects --- */
    --base-font-size: 16px;
    --border-radius: 0.75rem; /* 12px */
    --border-radius-small: 0.5rem; /* 8px */
    --shadow-soft: 0 4px 12px rgba(0, 0, 0, 0.25);
    --shadow-medium: 0 6px 20px rgba(0, 0, 0, 0.3);
    --shadow-glow-accent: 0 0 15px rgba(var(--accent-primary-rgb), 0.3);
    --shadow-glow-accent-secondary: 0 0 15px rgba(var(--accent-secondary-rgb), 0.3);

    --transition-duration: 0.25s;
    --transition-timing: ease-in-out;
    --transition-main: all var(--transition-duration) var(--transition-timing);

    --header-height: 4.5rem; /* Approx 72px */
    --footer-height: 4rem; /* Approx 64px */
    --main-padding: 1.5rem; /* Consistent padding for major containers */
    --element-gap: 1rem; /* Gap between elements within a section */
    --section-gap: 1.5rem; /* Gap between larger sections */

    --changelog-margin: 1.5rem; /* Margin for the changelog modal */
}

/*=============================================
  BASE RESET & BODY SETUP
=============================================*/
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: var(--base-font-size);
    scroll-behavior: smooth;
}

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
}

body.no-scroll {
    overflow: hidden;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/*=============================================
  APP LAYOUT CONTAINER
=============================================*/
.app-container {
    width: 100%;
    max-width: 100%;
    min-height: 100vh;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    position: relative;
}

/*=============================================
  HEADER
=============================================*/
.site-header {
    background: linear-gradient(135deg, var(--bg-secondary), rgba(var(--bg-secondary-rgb), 0.8));
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    margin: var(--main-padding) var(--main-padding) 0;
    padding: var(--main-padding);
    border-radius: var(--border-radius);
    height: var(--header-height);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-soft);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-shrink: 0;
    gap: var(--section-gap);
    z-index: 100;
}

.site-header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    background: linear-gradient(45deg, var(--accent-primary), var(--accent-secondary));
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin: 0;
    white-space: nowrap;
}

.site-header h1#site-title-button {
    cursor: pointer;
    user-select: none;
    transition: filter var(--transition-duration) var(--transition-timing);
}

.site-header h1#site-title-button:hover {
    filter: brightness(1.25) saturate(1.1);
}

.model-imports {
    display: flex;
    gap: var(--element-gap);
    align-items: center;
    flex-wrap: wrap;
}

.model-loader-group {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.site-header select,
.site-header input[type="text"],
.site-header button:not(.header-icon-button) {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    background-color: var(--bg-element);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-small);
    color: var(--text-primary);
    transition: var(--transition-main);
    height: 36px;
    display: inline-flex;
    align-items: center;
}

.site-header select,
.site-header button:not(.header-icon-button) {
    cursor: pointer;
}

.site-header input[type="text"] {
    min-width: 15rem;
    cursor: text;
}

.site-header input[type="text"]::placeholder {
    color: var(--text-secondary);
    opacity: 0.7;
}

.site-header select {
    min-width: 12rem;
}

.site-header select:focus,
.site-header input[type="text"]:focus,
.site-header button:not(.header-icon-button):focus-visible {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(var(--accent-primary-rgb), 0.4);
}

.site-header button:not(.header-icon-button) {
    background-color: var(--accent-primary);
    font-weight: 500;
}

#model-url-input:hover,
#model-select:hover {
    border-color: var(--accent-primary);
}

#load-url-button:hover,
#load-selected-button:hover {
    background-color: color-mix(in srgb, var(--accent-primary) 85%, white);
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-glow-accent);
}

/*=============================================
  MAIN CONTENT LAYOUT (2-COLUMN)
=============================================*/
.main-content {
    display: flex;
    flex-grow: 1;
    padding: var(--main-padding);
    gap: var(--main-padding);
    min-height: 0;
    height: calc(100vh - var(--header-height) - var(--footer-height) - (2 * var(--main-padding)));
}

/*=============================================
  CANVAS AREA
=============================================*/
.canvas-area {
    flex: 3;
    min-width: 0;
    background-color: var(--bg-secondary);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-medium);
    position: relative;
    overflow: hidden;
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    touch-action: none;
}

#live2d-canvas {
    display: block;
    width: 100%;
    height: 100%;
    background-color: transparent;
    object-fit: contain;
    /* PIXI sets cursor (grab, grabbing) */
}

.loading-overlay,
.canvas-message {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 1rem;
    z-index: 10;
    border-radius: var(--border-radius);
}

.loading-overlay {
    background-color: rgba(var(--bg-primary-rgb), 0.9);
}

.spinner {
    width: 3.5rem;
    height: 3.5rem;
    border: 6px solid var(--bg-element);
    border-top-color: var(--accent-primary);
    border-left-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-bottom: 1.25rem;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.loading-text {
    font-size: 1.1rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.canvas-message {
    color: var(--text-secondary);
    background-color: rgba(var(--bg-secondary-rgb), 0.95);
    font-size: 1.3rem;
}

.canvas-message i {
    font-size: 4rem;
    margin-bottom: 1rem;
    color: var(--accent-primary);
    opacity: 0.8;
}

.canvas-message p {
    max-width: 80%;
}

/*=============================================
  CONTROL SIDEBAR
=============================================*/
.control-panel {
    flex: 1;
    min-width: 20rem;
    max-width: 22rem;
    background-color: var(--bg-secondary);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-medium);
    border: 1px solid var(--border-color);
    padding: var(--main-padding);
    display: flex;
    flex-direction: column;
    gap: var(--section-gap);
    overflow-y: auto;
    max-height: 100%;
}

.control-panel::-webkit-scrollbar {
    width: 10px;
}

.control-panel::-webkit-scrollbar-track {
    background: var(--bg-element);
    border-radius: var(--border-radius-small);
    margin: 5px 0;
}

.control-panel::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, var(--accent-primary), var(--accent-secondary));
    border-radius: var(--border-radius-small);
    border: 2px solid var(--bg-element);
}

.control-panel::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, color-mix(in srgb, var(--accent-primary) 85%, white), color-mix(in srgb, var(--accent-secondary) 85%, white));
}

.control-item {
    padding: 0.5rem 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

/* Custom toggle switch for #show-hit-areas-checkbox */
.control-item input[type="checkbox"]#show-hit-areas-checkbox {
    position: absolute;
    width: 1px; height: 1px; margin: -1px; padding: 0;
    overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}
.control-item label[for="show-hit-areas-checkbox"] {
    cursor: pointer; position: relative; padding-left: 3em;
    font-size: 0.95rem; color: var(--text-secondary);
    display: inline-flex; align-items: center; user-select: none;
    min-height: 1.5em; transition: color var(--transition-duration) var(--transition-timing);
}
.control-item label[for="show-hit-areas-checkbox"]::before,
.control-item label[for="show-hit-areas-checkbox"]::after {
    content: ""; position: absolute; top: 50%; transition: var(--transition-main);
}
.control-item label[for="show-hit-areas-checkbox"]::before {
    left: 0; transform: translateY(-50%);
    width: 2.5em; height: 1.3em; border-radius: 0.65em;
    background: var(--bg-element); border: 1px solid var(--border-color);
}
.control-item label[for="show-hit-areas-checkbox"]::after {
    left: 0.2em; transform: translateY(-50%);
    width: 0.9em; height: 0.9em; border-radius: 50%;
    background: var(--text-secondary);
    transition: var(--transition-main), transform var(--transition-duration) var(--transition-timing);
}
.control-item input[type="checkbox"]#show-hit-areas-checkbox:checked+label[for="show-hit-areas-checkbox"]::before {
    background: var(--accent-primary); border-color: var(--accent-primary);
}
.control-item input[type="checkbox"]#show-hit-areas-checkbox:checked+label[for="show-hit-areas-checkbox"]::after {
    background: var(--text-primary); transform: translateY(-50%) translateX(1.2em);
}
.control-item input[type="checkbox"]#show-hit-areas-checkbox:focus-visible+label[for="show-hit-areas-checkbox"]::before {
    box-shadow: 0 0 0 3px rgba(var(--accent-primary-rgb), 0.4);
}
.control-item input[type="checkbox"]#show-hit-areas-checkbox:disabled+label[for="show-hit-areas-checkbox"] {
    cursor: not-allowed; opacity: 0.6;
}
.control-item input[type="checkbox"]#show-hit-areas-checkbox:disabled+label[for="show-hit-areas-checkbox"]::before {
    background: var(--bg-element); border-color: var(--border-color);
}
.control-item input[type="checkbox"]#show-hit-areas-checkbox:disabled+label[for="show-hit-areas-checkbox"]::after {
    background: var(--text-secondary);
}

#delete-selected-model-button {
    background-color: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 1.1rem;
    padding: 0.4rem 0.6rem;
    cursor: pointer;
    border-radius: var(--border-radius-small);
    transition: var(--transition-main);
    line-height: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

#delete-selected-model-button:hover:not(:disabled),
#delete-selected-model-button:focus-visible:not(:disabled) {
    color: var(--error-color);
    background-color: rgba(var(--error-color-rgb), 0.1);
}

#delete-selected-model-button:focus-visible:not(:disabled) {
    outline: 2px solid var(--error-color);
    outline-offset: 1px;
}

#delete-selected-model-button:disabled {
    color: var(--border-color);
    cursor: not-allowed;
    opacity: 0.5;
}

.panel-section {
    background-color: rgba(var(--bg-primary-rgb), 0.3);
    border-radius: var(--border-radius-small);
    padding: var(--element-gap);
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.panel-section h3 {
    margin-bottom: var(--element-gap);
    color: var(--accent-primary);
    font-size: 1.1rem;
    font-weight: 600;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
}

.panel-section h3::before {
    font-family: "Font Awesome 6 Free";
    font-weight: 900;
    margin-right: 0.5em;
    color: var(--accent-secondary);
    font-size: 0.9em;
}

.panel-section:nth-of-type(2) h3::before { /* Expressions */
    content: '\f06e';
}
.panel-section:nth-of-type(3) h3::before { /* Motions */
    content: '\f0b2';
}
.panel-section:nth-of-type(4) h3::before { /* Hit Areas */
    content: '\f05b';
}

.model-features-container {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.feature-btn {
    padding: 0.6rem 0.8rem;
    background-color: var(--bg-element);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-small);
    cursor: pointer;
    transition: var(--transition-main);
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-align: center;
    flex-grow: 1;
    min-width: calc(50% - (0.75rem / 2));
    font-weight: 500;
    line-height: 1.4;
    word-break: break-word;
}

.feature-btn:hover,
.feature-btn:focus-visible {
    background-color: var(--bg-interactive);
    color: var(--text-primary);
    border-color: var(--accent-primary);
    transform: translateY(-2px) scale(1.02);
    box-shadow: var(--shadow-soft);
}

.feature-btn:focus-visible {
    box-shadow: var(--shadow-soft), 0 0 0 2px rgba(var(--accent-primary-rgb), 0.3);
}

.feature-btn.active {
    background: var(--accent-primary);
    color: var(--text-primary);
    border-color: var(--accent-primary);
    box-shadow: 0 2px 8px rgba(var(--accent-primary-rgb), 0.4);
}

.feature-btn.active:hover,
.feature-btn.active:focus-visible {
    background: color-mix(in srgb, var(--accent-primary) 85%, white);
    border-color: color-mix(in srgb, var(--accent-primary) 85%, white);
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 4px 12px rgba(var(--accent-primary-rgb), 0.5);
}

.no-content-message {
    color: var(--text-secondary);
    font-style: italic;
    width: 100%;
    text-align: center;
    padding: 1rem;
    background-color: rgba(var(--bg-element), 0.5);
    border-radius: var(--border-radius-small);
    font-size: 0.85rem;
    border: 1px dashed var(--border-color);
}

/*=============================================
  FOOTER
=============================================*/
.site-footer {
    text-align: center;
    margin: 0 var(--main-padding) var(--main-padding) var(--main-padding);
    padding: var(--main-padding);
    height: var(--footer-height);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    box-shadow: 0 -2px 8px rgba(0, 0, 0, 0.15);
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 0.25rem;
}

.site-footer p {
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin: 0;
}

.site-footer a {
    color: var(--accent-primary);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-duration) var(--transition-timing),
        text-shadow var(--transition-duration) var(--transition-timing);
}

.site-footer a:hover,
.site-footer a:focus-visible {
    color: var(--accent-secondary);
    text-decoration: underline;
    text-shadow: 0 0 5px rgba(var(--accent-secondary-rgb), 0.5);
}

/*=============================================
  RESPONSIVE STYLES
=============================================*/
@media (max-width: 1050px) {
    :root {
        --changelog-margin: 1rem;
    }

    .main-content {
        flex-direction: column;
        height: auto;
        overflow-y: auto;
    }

    .control-panel {
        width: 100%;
        max-width: none;
        min-width: auto;
        max-height: 45vh;
        flex: 0 0 auto;
    }

    .canvas-area {
        min-height: 40vh;
        max-height: 60vh;
        flex: 1 1 auto;
    }

    .site-header {
        height: auto;
        padding: var(--element-gap) var(--main-padding);
        flex-direction: column;
        align-items: stretch;
    }

    .site-header h1 {
        text-align: center;
        margin-bottom: var(--element-gap);
    }

    .model-imports {
        flex-direction: column;
        width: 100%;
        gap: var(--element-gap);
    }

    .model-loader-group {
        width: 100%;
        flex-direction: column;
    }

    .site-header select,
    .site-header input[type="text"],
    .site-header button {
        width: 100%;
        min-width: auto;
    }
}

@media (max-width: 768px) {
    :root {
        --main-padding: 1rem;
        --element-gap: 0.75rem;
        --section-gap: 1rem;
        --base-font-size: 15px;
        --changelog-margin: 0.75rem;
    }

    .site-header h1 {
        font-size: 1.5rem;
    }

    .control-panel {
        max-height: 50vh;
        padding: var(--element-gap);
    }

    .panel-section {
        padding: var(--element-gap);
    }

    .panel-section h3 {
        font-size: 1rem;
    }

    .canvas-area {
        min-height: 35vh;
        max-height: 50vh;
    }

    .canvas-message {
        font-size: 1.1rem;
    }

    .canvas-message i {
        font-size: 3rem;
    }

    .feature-btn {
        font-size: 0.8rem;
        padding: 0.5rem 0.7rem;
        min-width: calc(50% - (var(--element-gap) / 2));
    }

    .site-footer {
        height: auto;
        padding-top: var(--element-gap);
        padding-bottom: var(--element-gap);
    }

    .site-footer p {
        font-size: 0.8rem;
    }
}