/* 小提琴 — Violin */
@import url('https://fonts.googleapis.com/css2?family=Cinzel:wght@400;700&family=EB+Garamond:ital,wght@0,400;0,600;1,400&family=MedievalSharp&family=Uncial+Antiqua&display=swap');

:root {
    --parchment: #f4e4c1;
    --parchment-light: #faf0d7;
    --parchment-dark: #d4b896;
    --ink: #3a2a1a;
    --ink-light: rgba(58, 42, 26, 0.6);
    --ink-faint: rgba(58, 42, 26, 0.2);
    --sepia: #704214;
    --gold: #b8860b;
    --gold-bright: #daa520;
    --hl-color: #daa520;
    --panel-bg: #faf0d7;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    width: 100vw;
    height: 100vh;
    overflow: hidden;
    background: #1a0e04;
    font-family: 'EB Garamond', serif;
}

/* ===== ENTRANCE ===== */
.entrance-overlay {
    position: fixed;
    inset: 0;
    background: #1a0e04;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    animation: entranceFadeOut 1.5s 5s forwards;
}

@keyframes entranceFadeOut {
    to {
        opacity: 0;
        pointer-events: none;
    }
}

.entrance-svg {
    width: 40vw;
    max-width: 400px;
    margin-bottom: 20px;
}

.entrance-draw line,
.entrance-draw rect,
.entrance-draw circle,
.entrance-draw path {
    stroke-dasharray: 4000;
    stroke-dashoffset: 4000;
    animation: drawStroke 3.5s ease-out forwards;
}

@keyframes drawStroke {
    to {
        stroke-dashoffset: 0;
    }
}

.entrance-title {
    font-family: 'Cinzel', serif;
    font-size: 2.2rem;
    color: var(--parchment);
    letter-spacing: 8px;
    opacity: 0;
    animation: fadeUp 1.2s 2.5s forwards;
}

.entrance-sub {
    font-family: 'EB Garamond', serif;
    font-style: italic;
    font-size: 1rem;
    color: var(--parchment-dark);
    letter-spacing: 4px;
    opacity: 0;
    animation: fadeUp 1s 3.5s forwards;
}

@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(15px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===== MAIN CONTAINER ===== */
.main-container {
    position: relative;
    width: 100vw;
    height: 100vh;
    opacity: 0;
    animation: mainFadeIn 1.5s 5.5s forwards;
}

@keyframes mainFadeIn {
    to {
        opacity: 1;
    }
}

.back-link {
    position: absolute;
    top: 8px;
    left: 12px;
    z-index: 100;
    font-family: 'Cinzel', serif;
    font-size: 0.75rem;
    color: var(--ink);
    text-decoration: none;
    border: 1px solid var(--ink-faint);
    padding: 4px 10px;
    border-radius: 2px;
    background: rgba(244, 228, 193, 0.8);
    transition: all 0.3s;
}

.back-link:hover {
    background: var(--parchment);
    border-color: var(--ink);
}

/* Playable Violin Toggle */
.violin-toggle-btn {
    position: absolute;
    top: 15px;
    right: 20px;
    z-index: 100;
    font-family: 'Cinzel', serif;
    font-size: 0.8rem;
    color: var(--ink);
    text-decoration: none;
    border: 1px solid var(--gold);
    padding: 6px 12px;
    border-radius: 3px;
    background: rgba(244, 228, 193, 0.9);
    transition: all 0.3s;
    cursor: pointer;
    letter-spacing: 1px;
}

.violin-toggle-btn:hover {
    background: var(--gold);
    color: #1a0e04;
    box-shadow: 0 0 10px rgba(218, 165, 32, 0.4);
}

/* ===== PARCHMENT ===== */
.parchment {
    position: relative;
    width: 97vw;
    height: 94vh;
    margin: 1.5vh auto;
    background:
        radial-gradient(ellipse at 15% 25%, rgba(180, 150, 100, 0.3) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 75%, rgba(160, 130, 80, 0.25) 0%, transparent 40%),
        radial-gradient(ellipse at 55% 20%, rgba(140, 110, 60, 0.15) 0%, transparent 35%),
        radial-gradient(ellipse at center, var(--parchment-light) 30%, var(--parchment) 65%, var(--parchment-dark) 100%);
    border-radius: 3px;
    box-shadow: 0 0 50px rgba(0, 0, 0, 0.6), inset 0 0 80px rgba(0, 0, 0, 0.06), inset 0 0 3px rgba(0, 0, 0, 0.1);
    display: flex;
    overflow: hidden;
}

.parchment::after {
    content: '';
    position: absolute;
    left: 33%;
    top: 0;
    bottom: 0;
    width: 6px;
    background: linear-gradient(to right, transparent, rgba(0, 0, 0, 0.06) 20%, rgba(0, 0, 0, 0.12) 50%, rgba(0, 0, 0, 0.06) 80%, transparent);
    z-index: 10;
    pointer-events: none;
}

/* ===== LEFT: LATIN TEXT ===== */
.parchment-left {
    width: 33%;
    height: 100%;
    padding: 30px 20px 20px 30px;
    position: relative;
    overflow: hidden;
    border-right: none;
}

.quill-svg {
    width: 100%;
    height: 100%;
}

.quill-title {
    font-family: 'Uncial Antiqua', cursive;
    font-size: 22px;
    fill: var(--ink);
    stroke: none;
    opacity: 0;
    clip-path: inset(0 100% -20% -10%);
}

.quill-ornament {
    stroke: var(--ink);
    stroke-width: 0.5;
    opacity: 0;
    clip-path: inset(0 100% -20% -10%);
}

.quill-line {
    font-family: 'MedievalSharp', cursive;
    font-size: 14px;
    fill: var(--ink);
    stroke: none;
    opacity: 0;
    clip-path: inset(0 100% -20% -10%);
}

.quill-date {
    font-family: 'Cinzel', serif;
    font-size: 14px;
    fill: var(--sepia);
    stroke: none;
    opacity: 0;
    clip-path: inset(0 100% -20% -10%);
}

.writing-active {
    opacity: 1 !important;
    animation: writeSmooth 1.5s linear forwards;
}

@keyframes writeSmooth {
    from {
        clip-path: inset(0 100% -20% -10%);
    }

    to {
        clip-path: inset(0 -10% -20% -10%);
    }
}

.quill-pen {
    position: absolute;
    width: 40px;
    height: 60px;
    top: 0;
    left: 0;
    opacity: 0;
    pointer-events: none;
    transition: transform 0.1s linear, top 1.5s cubic-bezier(0.4, 0, 0.2, 1), left 1.5s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 5;
    transform-origin: bottom left;
}

/* ===== RIGHT: VIOLIN AREA ===== */
.parchment-right {
    width: 67%;
    height: 100%;
    display: flex;
    padding: 5px 8px;
    position: relative;
}

.violin-layout {
    display: flex;
    width: 100%;
    height: 100%;
    align-items: stretch;
}

.label-column {
    display: flex;
    flex-direction: column;
    gap: 2px;
    width: 135px;
    flex-shrink: 0;
    padding: 8px 3px;
    overflow-y: auto;
    justify-content: center;
}

.label-column::-webkit-scrollbar {
    width: 3px;
}

.label-column::-webkit-scrollbar-thumb {
    background: var(--ink-faint);
    border-radius: 2px;
}

.violin-center {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    position: relative;
}

.violin-wrapper {
    position: relative;
    width: 48vmin;
    max-width: 550px;
}

#violin-svg {
    width: 100%;
    height: auto;
    overflow: visible;
    cursor: pointer;
}

.violin-hint {
    font-family: 'EB Garamond', serif;
    font-size: 0.8rem;
    color: var(--ink-light);
    margin-top: 8px;
    font-style: italic;
    letter-spacing: 1px;
    animation: hintPulse 2s ease-in-out infinite;
}

@keyframes hintPulse {

    0%,
    100% {
        opacity: 0.5;
    }

    50% {
        opacity: 1;
    }
}

/* ===== FEATURE BUTTONS ===== */
.feature-btn {
    background: rgba(180, 150, 100, 0.08);
    border: 1px solid var(--ink-faint);
    padding: 3px 6px;
    font-family: 'EB Garamond', serif;
    font-size: 0.68rem;
    color: var(--ink);
    cursor: pointer;
    width: 100%;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    text-align: left;
    letter-spacing: 0.3px;
    position: relative;
    border-radius: 2px;
    display: flex;
    align-items: center;
    gap: 3px;
    line-height: 1.2;
}

.feature-btn:hover,
.feature-btn.active {
    background: rgba(184, 134, 11, 0.12);
    border-color: var(--gold);
    color: var(--gold);
    box-shadow: 0 1px 8px rgba(184, 134, 11, 0.1);
}

.label-column-left .feature-btn:hover {
    transform: translateX(2px);
}

.label-column-right .feature-btn:hover {
    transform: translateX(-2px);
}

.btn-dot {
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: var(--ink-faint);
    flex-shrink: 0;
    transition: background 0.3s;
}

.feature-btn:hover .btn-dot,
.feature-btn.active .btn-dot {
    background: var(--gold);
    box-shadow: 0 0 4px var(--gold);
}

.btn-arrow {
    font-size: 0.7rem;
    opacity: 0.4;
    transition: opacity 0.3s;
    flex-shrink: 0;
}

.feature-btn:hover .btn-arrow {
    opacity: 1;
}

.btn-status {
    display: block;
    font-size: 0.55rem;
    color: var(--ink-light);
    font-family: 'EB Garamond', serif;
    font-style: italic;
    margin-top: 1px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 80px;
}

.btn-label-wrap {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
}

.btn-label-text {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* ===== SVG STYLES ===== */
.violin-part {
    transition: transform 0.8s cubic-bezier(0.2, 0.8, 0.2, 1), opacity 0.8s ease;
    transform-origin: center center;
}

.violin-part.hidden-part {
    opacity: 0;
    pointer-events: none;
}

.violin-part.visible-part {
    opacity: 1;
    pointer-events: auto;
}

.part-label {
    font-family: 'EB Garamond', serif;
    font-size: 8px;
    fill: var(--sepia);
    opacity: 0;
    transition: opacity 0.5s ease 0.8s;
    pointer-events: none;
    text-anchor: middle;
}

.part-label.visible {
    opacity: 1;
}

.sketch-line {
    fill: none;
    stroke: var(--ink);
    stroke-width: 1.5;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.sketch-stroke {
    fill: none;
    stroke: var(--ink);
    stroke-width: 1.2;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.sketch-fill {
    fill: rgba(180, 150, 100, 0.08);
    stroke: var(--ink);
    stroke-width: 1;
}

.sketch-thin {
    fill: none;
    stroke: var(--ink);
    stroke-width: 0.6;
}

.sketch-bold {
    fill: none;
    stroke: var(--ink);
    stroke-width: 2.2;
}

.sketch-hatch {
    fill: url(#crosshatch);
    stroke: var(--ink);
    stroke-width: 0.8;
}

.sketch-gold {
    fill: rgba(184, 134, 11, 0.15);
    stroke: var(--gold);
    stroke-width: 1.5;
}

.highlightable {
    transition: filter 0.4s, opacity 0.4s;
}

.highlightable.highlighted {
    filter: url(#hl-glow-violin) !important;
    opacity: 1 !important;
    z-index: 10;
}

.highlightable.highlighted .sketch-stroke,
.highlightable.highlighted .sketch-fill,
.highlightable.highlighted .sketch-thin,
.highlightable.highlighted .sketch-bold,
.highlightable.highlighted .sketch-line,
.highlightable.highlighted .sketch-gold {
    stroke: var(--hl-color) !important;
    stroke-width: 3 !important;
    transition: stroke 0.3s, stroke-width 0.3s;
}

.dimmed {
    opacity: 0.15 !important;
    filter: grayscale(0.8) !important;
}

/* ===== CONTROLS ===== */
.violin-controls {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: 6px;
}

.control-btn {
    font-family: 'Cinzel', serif;
    font-size: 0.7rem;
    padding: 5px 14px;
    background: rgba(180, 134, 11, 0.08);
    border: 1px solid var(--gold);
    color: var(--gold);
    cursor: pointer;
    border-radius: 3px;
    transition: all 0.3s ease;
    letter-spacing: 1px;
}

.control-btn:hover {
    background: rgba(180, 134, 11, 0.2);
    box-shadow: 0 2px 12px rgba(184, 134, 11, 0.2);
    transform: translateY(-1px);
}

/* ===== FEATURE PANEL ===== */
.feature-panel {
    position: fixed;
    top: 0;
    right: -50vw;
    width: 46vw;
    height: 100vh;
    background: radial-gradient(ellipse at 50% 50%, var(--parchment-light) 0%, var(--parchment) 100%);
    border-left: 2px solid var(--ink-faint);
    z-index: 1000;
    overflow-y: auto;
    transition: right 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: -8px 0 40px rgba(0, 0, 0, 0.25);
}

.feature-panel.open {
    right: 0;
}

.close-panel-btn {
    position: sticky;
    top: 10px;
    float: right;
    margin: 10px;
    width: 30px;
    height: 30px;
    border: 1px solid var(--ink-faint);
    background: transparent;
    color: var(--ink);
    font-size: 1.2rem;
    cursor: pointer;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 10;
    transition: all 0.3s;
}

.close-panel-btn:hover {
    background: var(--ink);
    color: var(--panel-bg);
}

.feature-panel-inner {
    max-width: 600px;
    width: 90%;
    padding: 30px 20px;
    margin: 0 auto;
}

.fp-title {
    font-family: 'Cinzel', serif;
    font-size: 1.5rem;
    color: var(--ink);
    letter-spacing: 2px;
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--ink-faint);
}

.fp-desc {
    font-family: 'EB Garamond', serif;
    font-size: 1rem;
    color: var(--ink);
    line-height: 1.7;
    margin-bottom: 20px;
}

.fp-demo-section {
    background: rgba(0, 0, 0, 0.03);
    border: 1px solid var(--ink-faint);
    border-radius: 4px;
    padding: 15px;
    margin-bottom: 18px;
}

.fp-demo-title {
    font-family: 'Cinzel', serif;
    font-size: 0.85rem;
    color: var(--sepia);
    margin-bottom: 10px;
    letter-spacing: 1px;
}

.fp-demo {
    min-height: 100px;
    display: flex;
    justify-content: center;
    margin-bottom: 10px;
    cursor: crosshair;
}

.fp-demo svg {
    max-width: 100%;
    height: auto;
}

.demo-interactive {
    cursor: pointer;
    transition: stroke 0.1s;
}

.demo-interactive:active {
    stroke: var(--gold-bright) !important;
    stroke-width: 3;
}

.fp-demo-note {
    font-family: 'EB Garamond', serif;
    font-size: 0.85rem;
    color: var(--ink-light);
    white-space: pre-line;
    line-height: 1.5;
    border-left: 2px solid var(--gold);
    padding-left: 10px;
}

.fp-details {
    font-family: 'EB Garamond', serif;
    font-size: 0.9rem;
    color: var(--ink);
    line-height: 1.6;
}

.fp-details h3 {
    font-family: 'Cinzel', serif;
    font-size: 0.8rem;
    margin: 12px 0 5px;
    color: var(--ink);
    letter-spacing: 1px;
}

.fp-details ul,
.fp-details ol {
    padding-left: 16px;
    margin-bottom: 6px;
}

.fp-details li {
    margin-bottom: 3px;
}

/* ===== INTERACTIVE PLAYABLE MODAL ===== */
.violin-modal {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -40%);
    width: 90vw;
    max-width: 900px;
    background: var(--parchment);
    border: 2px solid var(--ink);
    border-radius: 4px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.6);
    z-index: 2000;
    opacity: 0;
    pointer-events: none;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    display: flex;
    flex-direction: column;
}

.violin-modal.open {
    opacity: 1;
    pointer-events: auto;
    transform: translate(-50%, -50%);
}

.violin-header {
    background: var(--ink);
    color: var(--parchment);
    padding: 8px 15px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-radius: 2px 2px 0 0;
}

.violin-header-title {
    font-family: 'Cinzel', serif;
    font-size: 1rem;
    letter-spacing: 2px;
}

.violin-close {
    background: none;
    border: none;
    color: var(--parchment);
    font-size: 1.5rem;
    cursor: pointer;
    transition: color 0.2s;
}

.violin-close:hover {
    color: var(--gold);
}

.violin-container {
    padding: 40px 20px;
    background: #111;
    position: relative;
    display: flex;
    justify-content: center;
    overflow: hidden;
}

/* Fingerboard in Modal */
.modal-fingerboard {
    width: 600px;
    height: 120px;
    background: linear-gradient(to bottom, #222, #000);
    border-radius: 20px 0 0 20px;
    position: relative;
    border: 1px solid #333;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: stretch;
}

/* Frets for reference (optional on violin but helpful for demo) */
.finger-marker {
    position: absolute;
    top: 0;
    bottom: 0;
    width: 1px;
    background: rgba(255, 255, 255, 0.1);
    pointer-events: none;
}

.modal-string {
    height: 30px;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: stretch;
    cursor: pointer;
}

.modal-string-line {
    position: absolute;
    left: 0;
    right: 0;
    height: 1px;
    background: #ddd;
    top: 50%;
    z-index: 1;
    transform-origin: left;
    transition: height 0.1s, background 0.1s;
}

.modal-string:hover .modal-string-line {
    background: #fff;
    box-shadow: 0 0 5px #fff;
}

.modal-string:active .modal-string-line {
    height: 3px;
    background: var(--gold);
    box-shadow: 0 0 10px var(--gold);
}

.modal-string-hover-area {
    width: 100%;
    height: 100%;
    position: relative;
    z-index: 2;
}