:root {
    --bg: #0b0c10;
    --bg-soft: #12141a;
    --panel: rgba(17, 20, 28, 0.9);
    --panel-2: rgba(22, 26, 36, 0.92);
    --line: rgba(137, 152, 186, 0.18);
    --line-strong: rgba(165, 180, 219, 0.28);
    --text: #ecf1ff;
    --text-soft: #a7b0c8;
    --text-dim: #7f8aa6;
    --accent: #67d6ff;
    --accent-strong: #25b8ff;
    --accent-warm: #ffb36a;
    --success: #5ce5b0;
    --shadow: 0 24px 60px rgba(0, 0, 0, 0.42);
    --radius-lg: 22px;
    --radius-md: 16px;
    --radius-sm: 12px;
}

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

body {
    font-family: 'Space Grotesk', system-ui, sans-serif;
    color: var(--text);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: background 0.3s, color 0.3s;
    background:
        radial-gradient(circle at 12% 18%, rgba(103, 214, 255, 0.14), transparent 26%),
        radial-gradient(circle at 88% 14%, rgba(255, 179, 106, 0.1), transparent 24%),
        radial-gradient(circle at 60% 110%, rgba(89, 229, 176, 0.1), transparent 28%),
        linear-gradient(180deg, #0f1218 0%, #090a0e 100%);
    position: relative;
    overflow-x: hidden;
    padding-bottom: 86px;
}

body::before {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    opacity: 0.35;
    background-image:
        linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
    background-size: 32px 32px;
    mask-image: radial-gradient(circle at center, black 55%, transparent 100%);
}

body::after {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    background: linear-gradient(180deg, rgba(8, 9, 12, 0) 0%, rgba(8, 9, 12, 0.18) 100%);
}

body.light-mode {
    --bg: #f4f0e8;
    --bg-soft: #f8f5ee;
    --panel: rgba(255, 252, 246, 0.94);
    --panel-2: rgba(247, 243, 235, 0.96);
    --line: rgba(104, 97, 84, 0.16);
    --line-strong: rgba(104, 97, 84, 0.26);
    --text: #1f232d;
    --text-soft: #50596c;
    --text-dim: #6e7482;
    --accent: #0077ff;
    --accent-strong: #005fd1;
    --accent-warm: #c77824;
    --success: #129b69;
    --shadow: 0 18px 42px rgba(78, 59, 29, 0.08);
    background:
        radial-gradient(circle at 12% 18%, rgba(0, 119, 255, 0.08), transparent 25%),
        radial-gradient(circle at 84% 12%, rgba(199, 120, 36, 0.08), transparent 24%),
        linear-gradient(180deg, #f7f3ec 0%, #ede7dd 100%);
    color: var(--text);
}

body.light-mode::before {
    opacity: 0.18;
}

#mainTitle {
    text-decoration: none;
    color: inherit;
    cursor: pointer;
    transition: opacity 0.2s ease, transform 0.2s ease;
}

#mainTitle:hover {
    opacity: 0.92;
}

#mainTitle:visited {
    color: inherit;
}

.container {
    max-width: 1440px;
    margin: 0 auto;
    width: 100%;
    padding: 34px 22px;
    flex-grow: 1;
}

.header {
    margin-bottom: 30px;
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    gap: 20px;
    padding: 28px;
    border: 1px solid var(--line);
    border-radius: 28px;
    background:
        linear-gradient(135deg, rgba(255,255,255,0.04), rgba(255,255,255,0.01)),
        var(--panel);
    backdrop-filter: blur(18px);
    box-shadow: var(--shadow);
    position: relative;
    overflow: hidden;
}

.header::before {
    content: "";
    position: absolute;
    inset: 0;
    pointer-events: none;
    background:
        linear-gradient(120deg, rgba(103, 214, 255, 0.12), transparent 40%),
        linear-gradient(300deg, rgba(255, 179, 106, 0.1), transparent 32%);
}

.title-block {
    position: relative;
    z-index: 1;
    max-width: 820px;
}

.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
    padding: 6px 10px;
    border: 1px solid var(--line-strong);
    border-radius: 999px;
    background: rgba(255,255,255,0.04);
    color: var(--text-soft);
    text-transform: uppercase;
    letter-spacing: 0.16em;
    font-size: 11px;
    font-weight: 700;
}

.eyebrow::before {
    content: "";
    width: 8px;
    height: 8px;
    border-radius: 999px;
    background: linear-gradient(180deg, var(--accent), var(--accent-warm));
    box-shadow: 0 0 16px color-mix(in srgb, var(--accent) 50%, transparent);
}

h1 {
    font-size: clamp(2.7rem, 4.4vw, 4.6rem);
    font-weight: 700;
    letter-spacing: -0.06em;
    line-height: 0.95;
    color: var(--text);
    margin-bottom: 10px;
}

.subtitle {
    color: var(--text-soft);
    font-size: 1rem;
    line-height: 1.6;
    max-width: 60ch;
}

.theme-toggle-btn {
    position: relative;
    z-index: 1;
    padding: 12px 16px;
    background: rgba(255,255,255,0.03);
    border: 1px solid var(--line-strong);
    color: var(--text);
    border-radius: 999px;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 12px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    cursor: pointer;
    transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease;
    white-space: nowrap;
    box-shadow: inset 0 1px 0 rgba(255,255,255,0.06);
}
.theme-toggle-btn:hover {
    transform: translateY(-1px);
    background: rgba(255,255,255,0.08);
    border-color: color-mix(in srgb, var(--accent) 35%, var(--line-strong));
}

.ad-banner-top, .ad-banner-bottom {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 50px;
    background: linear-gradient(135deg, rgba(255,255,255,0.03), rgba(255,255,255,0.015)), var(--panel-2);
    border: 1px solid var(--line);
    color: var(--text-soft);
    font-size: 14px;
    margin: 24px auto;
    border-radius: 20px;
    text-align: center;
    padding: 14px 20px;
    box-shadow: var(--shadow);
}

.ad-banner-top {
    margin-top: 0;
    margin-bottom: 28px;
}

.ad-banner-bottom {
    margin-top: 40px;
    margin-bottom: 0;
}

.donate-message a, .ad-banner-bottom a {
    color: var(--accent);
    font-weight: 700;
    text-decoration: none;
}

.donate-message a:hover, .ad-banner-bottom a:hover {
    text-decoration: underline;
}

.donate-message p, .ad-banner-bottom p {
    color: var(--text);
    font-size: 15px;
    line-height: 1.5;
}

.workspace {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 340px;
    gap: 26px;
    margin-bottom: 40px;
}

#workspaceContainer {
    display: block;
}

.canvas-section,
.panel,
.page-content,
.info-block,
.info,
.how-to-use li {
    background: linear-gradient(180deg, rgba(255,255,255,0.035), rgba(255,255,255,0.015)), var(--panel);
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
}

.canvas-section {
    padding: 22px;
    position: relative;
    overflow: hidden;
}

.canvas-section::before,
.panel::before,
.page-content::before,
.info-block::before,
.info::before {
    content: "";
    position: absolute;
    inset: 0;
    pointer-events: none;
    border-radius: inherit;
    background: linear-gradient(180deg, rgba(255,255,255,0.05), transparent 18%);
}

.canvas-container { display: flex; flex-direction: column; gap: 24px; }
.canvas-inner { display: flex; flex-direction: column; gap: 16px; }

.frame-controls {
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    gap: 12px;
    margin-bottom: 6px;
    padding-bottom: 14px;
    border-bottom: 1px solid var(--line);
}

.canvas-section-title {
    font-size: 12px;
    font-weight: 700;
    color: var(--text);
    white-space: nowrap;
    justify-self: center;
    font-family: 'IBM Plex Mono', monospace;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.preset-grid { display: flex; gap: 8px; }

.preset-btn {
    width: 42px;
    height: 42px;
    padding: 0;
    background: rgba(255,255,255,0.03);
    border: 1px solid var(--line);
    border-radius: 14px;
    color: var(--text-soft);
    font-size: 20px;
    font-weight: 400;
    cursor: pointer;
    transition: all 0.12s ease;
    display: flex;
    justify-content: center;
    align-items: center;
    line-height: 1;
}
.preset-btn:hover {
    background: rgba(255,255,255,0.08);
    border-color: var(--line-strong);
    color: var(--text);
    transform: translateY(-1px);
}
.preset-btn.active {
    background: linear-gradient(180deg, color-mix(in srgb, var(--accent) 85%, white 0%), var(--accent-strong));
    border-color: transparent;
    color: #fff;
    box-shadow: 0 10px 24px rgba(37, 184, 255, 0.28);
}

.preset-btn[data-preset="sine"] { font-size: 24px; }
.preset-btn[data-preset="triangle"],
.preset-btn[data-preset="saw"],
.preset-btn[data-preset="square"] { font-size: 18px; line-height: 0.8; }

.action-group-right {
    display: flex;
    gap: 8px;
    align-items: center;
    flex-wrap: nowrap;
}

.btn-frame-action, .btn-frame-preview, .toggle-btn, .btn-play, .btn-export, .btn-secondary, .back-to-app-btn, .tilt-reset-btn, button {
    font-family: 'IBM Plex Mono', monospace;
}

.btn-frame-action, .btn-frame-preview {
    padding: 9px 11px;
    font-size: 12px;
    font-weight: 600;
    border-radius: 12px;
    transition: all 0.15s ease;
    white-space: nowrap;
}
.btn-frame-preview {
    background: linear-gradient(180deg, var(--accent), var(--accent-strong));
    color: #fff;
    border: none;
    box-shadow: 0 10px 24px rgba(37, 184, 255, 0.24);
}
.btn-frame-preview:hover { transform: translateY(-1px); }

.btn-frame-action {
    background: rgba(255,255,255,0.03);
    border: 1px solid var(--line);
    color: var(--text-soft);
}
.btn-frame-action:hover {
    background: rgba(255,255,255,0.08);
    color: var(--text);
}

.toggle-btn {
    padding: 9px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
    transition: all 0.15s ease;
    cursor: pointer;
    border: 1px solid transparent;
    text-align: left;
    display: flex;
    justify-content: space-between;
    align-items: center;
    line-height: 1;
    width: auto;
}
.toggle-btn.inactive {
    background: rgba(255,255,255,0.03);
    color: var(--text-soft);
    border-color: var(--line);
}
.toggle-btn.active {
    background: linear-gradient(180deg, var(--success), color-mix(in srgb, var(--success) 80%, #077653));
    color: #082216;
    border-color: transparent;
    box-shadow: 0 10px 24px rgba(92, 229, 176, 0.24);
}
.toggle-btn.inactive:hover {
    background: rgba(255,255,255,0.08);
    color: var(--text);
}
.toggle-btn.active:hover { transform: translateY(-1px); }

canvas {
    display: block;
    width: 100%;
    height: 360px;
    background: linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01)), #080a0f;
    border: 1px solid rgba(125, 145, 188, 0.14);
    border-radius: 18px;
    cursor: crosshair;
    touch-action: none;
    box-shadow: inset 0 1px 0 rgba(255,255,255,0.04), inset 0 0 0 1px rgba(255,255,255,0.02);
}

.sidebar { display: flex; flex-direction: column; gap: 20px; }
.panel {
    padding: 22px 20px;
    position: relative;
    overflow: hidden;
}
.panel-title {
    font-size: 11px;
    font-weight: 700;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 0.14em;
    margin-bottom: 18px;
    font-family: 'IBM Plex Mono', monospace;
}
.slider-control { margin-bottom: 22px; position: relative; }
.slider-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    margin-bottom: 10px;
}
.slider-label {
    font-size: 13px;
    color: var(--text-soft);
    font-weight: 500;
}

.slider-value-input {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 13px;
    color: var(--accent);
    font-weight: 700;
    font-variant-numeric: tabular-nums;
    border: none;
    background: transparent;
    width: auto;
    max-width: 60px;
    text-align: right;
    padding: 0;
    -webkit-appearance: none;
    -moz-appearance: textfield;
}
.slider-value-input::-webkit-outer-spin-button,
.slider-value-input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}
.volume-unit {
    font-size: 13px;
    color: var(--text-soft);
}

.slider-track-group {
    display: flex;
    align-items: center;
    gap: 8px;
}
.slider-track-group input[type="range"] {
    flex-grow: 1;
}

input[type="range"] {
    -webkit-appearance: none;
    width: 100%;
    height: 10px;
    background: rgba(255,255,255,0.08);
    border: 1px solid var(--line);
    border-radius: 999px;
    outline: none;
}
input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    background: linear-gradient(180deg, var(--accent), var(--accent-strong));
    border-radius: 999px;
    cursor: pointer;
    margin-top: -5px;
    box-shadow: 0 6px 16px rgba(37, 184, 255, 0.32);
}
input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border: none;
    background: linear-gradient(180deg, var(--accent), var(--accent-strong));
    border-radius: 999px;
    cursor: pointer;
}

.volume-control-inline {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    width: 82px;
    flex-shrink: 0;
}
.volume-header-inline {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    margin-bottom: 4px;
    gap: 4px;
}
.volume-header-inline .slider-label {
    font-size: 11px;
    margin-right: auto;
    color: var(--text-dim);
}
.volume-header-inline .slider-value-input {
    width: 26px;
    font-size: 11px;
}
.volume-header-inline .volume-unit {
    font-size: 11px;
}
.volume-control-inline input[type="range"] {
    height: 8px;
    width: 100%;
}

.footer-volume {
    width: 160px;
}
.footer-volume .volume-header-inline {
    justify-content: space-between;
}
.footer-volume .slider-label {
    font-size: 12px;
    font-weight: 700;
    color: var(--text-soft);
    letter-spacing: 0.08em;
}
.footer-volume .slider-value-input {
    width: 35px;
    font-size: 12px;
}

select {
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    width: 100%;
    padding: 12px 14px;
    background: rgba(255,255,255,0.04);
    border: 1px solid var(--line);
    border-radius: 14px;
    color: var(--text);
    font-size: 13px;
    cursor: pointer;
    margin-bottom: 16px;
    font-family: 'IBM Plex Mono', monospace;
    background-image: url('data:image/svg+xml;charset=US-ASCII,<svg xmlns="http://www.w3.org/2000/svg" width="292.4" height="292.4"><path fill="%23a7b0c8" d="M287 197.3l-139-139c-3-3-8-3-11 0l-139 139c-3 3-3 8 0 11l11 11c3 3 8 3 11 0l118-118 118 118c3 3 3 8 0 11z"/></svg>');
    background-repeat: no-repeat;
    background-position: right 12px top 50%;
    background-size: 10px auto;
}

.tilt-reset-btn {
    position: static;
    width: 28px;
    height: 28px;
    padding: 0;
    font-size: 15px;
    background: rgba(255,255,255,0.04);
    color: var(--text-soft);
    border: 1px solid var(--line);
    border-radius: 999px;
    line-height: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-shrink: 0;
}
.tilt-reset-btn:hover { background: rgba(255,255,255,0.08); color: var(--text); }

.actions { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
button { padding: 14px 20px; border: none; border-radius: 14px; font-size: 14px; font-weight: 600; cursor: pointer; transition: all 0.15s ease; }

.btn-play {
    background: linear-gradient(180deg, var(--accent), var(--accent-strong));
    color: #fff;
    box-shadow: 0 10px 24px rgba(37, 184, 255, 0.24);
}
.btn-play:hover { transform: translateY(-1px); }

.btn-export {
    background: linear-gradient(180deg, #6cf0bf, #15a875);
    color: #082216;
    box-shadow: 0 10px 24px rgba(92, 229, 176, 0.24);
}
.btn-export:hover { transform: translateY(-1px); }

.btn-secondary, .back-to-app-btn {
    background: rgba(255,255,255,0.04);
    border: 1px solid var(--line);
    color: var(--text-soft);
}
.btn-secondary:hover, .back-to-app-btn:hover {
    background: rgba(255,255,255,0.08);
    color: var(--text);
}

.info {
    font-size: 12px;
    color: var(--text-soft);
    line-height: 1.7;
    padding: 14px;
    position: relative;
    overflow: hidden;
}

.how-to-use {
    font-size: 14px;
    margin-top: 22px;
    padding-top: 8px;
}
.how-to-use h2 {
    font-size: 22px;
    margin-bottom: 16px;
    color: var(--text);
    letter-spacing: -0.03em;
}
.how-to-use ul {
    list-style: none;
    padding-left: 0;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 18px;
}
.how-to-use li {
    padding: 18px;
    line-height: 1.6;
}
.how-to-use li strong {
    color: var(--text);
    font-size: 15px;
    font-weight: 700;
    display: inline;
}
.how-to-use .emoji { margin-right: 5px; }

.page-content {
    display: none;
    padding: 40px;
    margin-top: 20px;
    margin-bottom: 40px;
    min-height: 50vh;
    position: relative;
    overflow: hidden;
}
.page-blocks {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 24px;
    margin-top: 28px;
}
.info-block {
    padding: 24px;
    position: relative;
    overflow: hidden;
}

.page-content h2 {
    font-size: 32px;
    color: var(--text);
    margin-bottom: 10px;
    letter-spacing: -0.04em;
}
.page-content h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--text);
    margin-top: 0;
    margin-bottom: 15px;
    border-bottom: 1px solid var(--line);
    padding-bottom: 8px;
}
.page-content p,
.page-content li {
    margin-bottom: 12px;
    line-height: 1.7;
    color: var(--text-soft);
    font-size: 14px;
}
.page-content ul {
    list-style: none;
    padding-left: 0;
    margin-bottom: 0;
}
.page-content li {
    background: none;
    padding: 0;
    border: none;
    box-shadow: none;
}
.page-content li strong {
    color: var(--text);
    display: inline;
    margin-bottom: 0;
}
.back-to-app-btn {
    margin-top: 30px;
    padding: 12px 16px;
}

.footer-wrapper {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    background: color-mix(in srgb, var(--bg-soft) 82%, transparent);
    border-top: 1px solid var(--line);
    z-index: 1000;
    backdrop-filter: blur(18px);
    padding: 10px 0;
}

.footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 5px 20px;
}
.footer .container {
    padding-top: 0;
    padding-bottom: 0;
}

.footer-links {
    font-size: 12px;
    color: var(--text-dim);
    text-align: center;
    flex-grow: 1;
    line-height: 1.6;
}

.footer-links a {
    color: var(--accent);
    text-decoration: none;
    padding: 0 5px;
}
.footer-links a:hover {
    color: var(--text);
    text-decoration: underline;
}

@media (max-width: 1024px) {
    .workspace { grid-template-columns: 1fr; }
    .sidebar { grid-template-columns: repeat(2, 1fr); display: grid; }
    .frame-controls {
        grid-template-columns: 1fr;
        justify-items: center;
    }
    .canvas-section-title { order: -1; }
    .action-group-right {
        flex-wrap: wrap;
        justify-content: center;
    }
    .page-blocks { grid-template-columns: 1fr; }
    .how-to-use ul { grid-template-columns: 1fr; }
    .ad-banner-top { height: auto; padding: 10px; }
    .footer {
        flex-direction: column;
        gap: 10px;
    }
    .footer-volume {
        width: 100%;
        align-items: center;
        order: 1;
    }
    .footer-volume .volume-header-inline {
        width: 100%;
    }
    .footer-links {
        order: 2;
        padding-top: 5px;
    }
    body {
        padding-bottom: 108px;
    }
    .page-content {
        margin-bottom: 100px;
    }
}

@media (max-width: 600px) {
    .sidebar { grid-template-columns: 1fr; }
    .preset-grid { width: 100%; justify-content: center; }
    .action-group-right { width: 100%; justify-content: center; }
    .page-content { padding: 28px 16px; }
}

@media (max-width: 480px) {
    .container {
        padding: 18px 10px;
    }
    .header {
        flex-direction: column;
        align-items: flex-start;
        padding: 22px 18px;
        margin-bottom: 20px;
    }
    .theme-toggle-btn {
        margin-top: 4px;
        align-self: flex-end;
    }
    .preset-grid {
        gap: 5px;
    }
    .preset-btn {
        width: 36px;
        height: 36px;
        border-radius: 12px;
    }
    .actions {
        grid-template-columns: 1fr;
        gap: 10px;
    }
    canvas {
        height: 260px;
    }
    .footer-links {
        font-size: 10px;
    }
}