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

body {
    background: #0d0d0d;
    color: #e0e0e0;
    font-family: 'Segoe UI', Arial, sans-serif;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 24px 16px;
}

header {
    width: 100%;
    max-width: 960px;
    margin-bottom: 20px;
}

header h1 {
    font-size: 1.4rem;
    font-weight: 600;
    color: #ffffff;
}

header p {
    font-size: 0.8rem;
    color: #888;
    margin-top: 4px;
}

/* ------------------------------------------------------------------ */
/* Config panel                                                        */
/* ------------------------------------------------------------------ */
#config-panel {
    width: 100%;
    max-width: 960px;
    background: #1a1a1a;
    border: 1px solid #2a2a2a;
    border-radius: 8px;
    margin-bottom: 20px;
    overflow: hidden;
}

.config-section-title {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 16px;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.6px;
    color: #aaa;
    background: #222;
    border-bottom: 1px solid #2a2a2a;
}

.config-section-title.sub {
    background: transparent;
    border-top: 1px solid #2a2a2a;
    border-bottom: 1px solid #2a2a2a;
    margin-top: 4px;
    font-size: 0.72rem;
}

#btn-toggle-config {
    background: none;
    border: 1px solid #444;
    color: #aaa;
    font-size: 0.7rem;
    padding: 3px 10px;
    border-radius: 4px;
    cursor: pointer;
}

#btn-toggle-config:hover { border-color: #888; color: #fff; }

.config-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px 20px;
    padding: 14px 16px;
}

.field-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.field-group.full-width { grid-column: 1 / -1; }

.field-group label {
    font-size: 0.72rem;
    color: #888;
    font-weight: 500;
}

.field-group input,
.field-group select {
    background: #111;
    border: 1px solid #333;
    border-radius: 4px;
    color: #e0e0e0;
    font-size: 0.8rem;
    padding: 6px 10px;
    outline: none;
    transition: border-color 0.15s;
}

.field-group input:focus,
.field-group select:focus  { border-color: #4fc3f7; }

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.8rem;
    color: #e0e0e0;
    cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
    width: 15px;
    height: 15px;
    accent-color: #4fc3f7;
    cursor: pointer;
}

.field-group-row {
    display: contents;
}


.mode-toggle {
    display: flex;
    gap: 6px;
    padding: 12px 16px 4px;
}

.mode-option {
    display: flex;
    align-items: center;
    gap: 7px;
    padding: 7px 18px;
    border: 1px solid #333;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.82rem;
    color: #aaa;
    transition: border-color 0.15s, color 0.15s;
}

.mode-option:has(input:checked) {
    border-color: #1976d2;
    color: #4fc3f7;
    background: rgba(25, 118, 210, 0.08);
}

.mode-option input[type="radio"] { display: none; }

.hint {
    color: #555;
    font-size: 0.68rem;
    font-weight: 400;
}

.derived-summary {
    display: flex;
    flex-wrap: wrap;
    gap: 6px 14px;
    padding: 10px 16px 14px;
    border-top: 1px solid #2a2a2a;
    font-size: 0.75rem;
    color: #777;
}

.derived-item b {
    color: #4fc3f7;
    margin-right: 3px;
}

.config-actions {
    padding: 12px 16px 16px;
    display: flex;
    justify-content: flex-end;
}

#btn-load {
    background: #1565c0;
    color: #fff;
    border: none;
    border-radius: 5px;
    padding: 9px 28px;
    font-size: 0.88rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.15s;
}

#btn-load:hover    { background: #1976d2; }
#btn-load:disabled { background: #333; color: #666; cursor: default; }

/* ------------------------------------------------------------------ */
/* Player wrapper                                                      */
/* ------------------------------------------------------------------ */
/* Shaka auto-init wraps the video — constrain via the container div */
#shaka-container {
    width: 100%;
    max-width: 960px;
    aspect-ratio: 16/9;
    background: #000;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 32px rgba(0,0,0,0.6);
    position: relative;
}

#shaka-container video {
    width: 100%;
    height: 100%;
    display: block;
}

#overlay-message {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(0,0,0,0.75);
    color: #fff;
    padding: 12px 22px;
    border-radius: 6px;
    font-size: 0.9rem;
    pointer-events: none;
    display: none;
    z-index: 9999;
}

#status-bar {
    width: 100%;
    max-width: 960px;
    margin-top: 16px;
    padding: 12px 16px;
    background: #1a1a1a;
    border-radius: 6px;
    font-size: 0.78rem;
    line-height: 1.8;
    border: 1px solid #2a2a2a;
}

.row {
    display: flex;
    gap: 8px;
    align-items: baseline;
    margin-bottom: 2px;
}

.label {
    color: #888;
    min-width: 160px;
    flex-shrink: 0;
}

.value {
    color: #4fc3f7;
    word-break: break-all;
}

.row.ok    .value { color: #66bb6a; }
.row.error .value { color: #ef5350; }