:root {
    --nardora-theme-panel: #2d190f;
    --nardora-theme-panel-elevated: #4a2c1a;
    --nardora-theme-border: #c18a4e;
    --nardora-theme-text: #fff8ec;
    --nardora-theme-muted-text: #ead4b4;
    --nardora-theme-focus: #ffd75e;
}

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

#theme-manager-button {
    flex: 0 0 40px;
    width: 40px;
    min-width: 40px;
    min-height: 40px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 4px;
    border: 1px solid rgba(255, 216, 126, 0.5);
    border-radius: 7px;
    background: rgba(29, 16, 8, 0.82);
    color: #fff4da;
    font: inherit;
    font-size: 0.78rem;
    font-weight: 700;
    cursor: pointer;
}

#theme-manager-button:hover {
    border-color: #ffd87e;
    background: rgba(66, 38, 20, 0.95);
}

#theme-manager-button:focus-visible,
.theme-option-card:focus-visible,
.theme-manager-close:focus-visible,
#theme-manager-close-footer-button:focus-visible,
#start-theme-manager-button:focus-visible {
    outline: 3px solid var(--nardora-theme-focus);
    outline-offset: 3px;
}

.theme-manager-button-icon {
    font-size: 1.05rem;
    line-height: 1;
}

.theme-manager-button-label {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
}

#start-screen-actions {
    flex-wrap: wrap;
}

#theme-manager-modal {
    position: fixed;
    inset: 0;
    z-index: 1400;
    align-items: center;
    justify-content: center;
    padding:
        max(16px, env(safe-area-inset-top))
        max(16px, env(safe-area-inset-right))
        max(16px, env(safe-area-inset-bottom))
        max(16px, env(safe-area-inset-left));
    background: rgba(9, 5, 3, 0.82);
    backdrop-filter: blur(8px);
    box-sizing: border-box;
}

body.is-theme-manager-open {
    overflow: hidden;
}

#theme-manager-card {
    width: min(760px, 100%);
    max-height: min(760px, calc(100dvh - 32px));
    display: flex;
    flex-direction: column;
    gap: 18px;
    overflow: auto;
    padding: clamp(18px, 3vw, 30px);
    border: 1px solid var(--nardora-theme-border);
    border-radius: 22px;
    background:
        radial-gradient(circle at 100% 0, rgba(255, 210, 120, 0.12), transparent 34%),
        linear-gradient(155deg, var(--nardora-theme-panel-elevated), var(--nardora-theme-panel));
    color: var(--nardora-theme-text);
    box-shadow: 0 28px 80px rgba(0, 0, 0, 0.56);
    box-sizing: border-box;
    scrollbar-gutter: stable;
}

#theme-manager-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 16px;
}

#theme-manager-header h2 {
    margin: 4px 0 0;
    color: var(--nardora-theme-text);
    font-size: clamp(1.45rem, 4vw, 2rem);
    line-height: 1.05;
}

#theme-manager-eyebrow {
    color: var(--nardora-theme-focus);
    font-size: 0.72rem;
    font-weight: 800;
    letter-spacing: 0.13em;
}

.theme-manager-close {
    flex: 0 0 auto;
    width: 44px;
    height: 44px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.24);
    color: var(--nardora-theme-text);
    font-size: 1.65rem;
    line-height: 1;
    cursor: pointer;
}

#theme-manager-description {
    max-width: 62ch;
    margin: 0;
    color: var(--nardora-theme-muted-text);
    line-height: 1.5;
}

#theme-manager-options {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
}

.theme-option-card {
    position: relative;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 13px;
    padding: 12px;
    border: 2px solid rgba(255, 255, 255, 0.18);
    border-radius: 16px;
    background: rgba(0, 0, 0, 0.2);
    color: var(--nardora-theme-text);
    text-align: left;
    cursor: pointer;
    transition: border-color 140ms ease, transform 140ms ease, background 140ms ease;
}

.theme-option-card:hover {
    transform: translateY(-2px);
    border-color: var(--theme-preview-focus);
    background: rgba(255, 255, 255, 0.07);
}

.theme-option-card.is-selected {
    border-color: var(--theme-preview-focus);
    box-shadow: 0 0 0 2px color-mix(in srgb, var(--theme-preview-focus) 35%, transparent);
}

.theme-option-preview {
    display: block;
    width: 100%;
    aspect-ratio: 8 / 5;
    overflow: hidden;
    border-radius: 10px;
    background: var(--theme-preview-frame);
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.16);
}

.theme-option-board {
    position: relative;
    display: block;
    height: calc(100% - 16px);
    margin: 8px;
    overflow: hidden;
    border-radius: 5px;
    background-color: var(--theme-preview-board);
    background-image:
        linear-gradient(72deg, transparent 0 49%, var(--theme-preview-point-light) 50% 100%),
        linear-gradient(108deg, var(--theme-preview-point-dark) 0 49%, transparent 50% 100%);
    background-position: left top, left bottom;
    background-size: 25% 50%;
    background-repeat: repeat-x;
    box-shadow: inset 0 0 18px rgba(0, 0, 0, 0.32);
}

.theme-option-bar {
    position: absolute;
    top: 0;
    bottom: 0;
    left: calc(50% - 6px);
    width: 12px;
    background: linear-gradient(90deg, var(--theme-preview-bar), var(--theme-preview-frame));
    box-shadow: 0 0 5px rgba(0, 0, 0, 0.45);
}

.theme-preview-checker {
    position: absolute;
    width: clamp(18px, 5vw, 32px);
    aspect-ratio: 1;
    border-radius: 50%;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.45), inset 0 0 0 2px rgba(0, 0, 0, 0.16);
}

.theme-preview-checker-white {
    left: 11%;
    bottom: 9%;
    background: radial-gradient(circle at 35% 30%, #ffffff, var(--theme-preview-white));
}

.theme-preview-checker-black {
    right: 11%;
    top: 9%;
    background: radial-gradient(circle at 35% 30%, #6b6059, var(--theme-preview-black));
}

.theme-option-copy {
    display: grid;
    gap: 5px;
}

.theme-option-copy strong {
    color: var(--nardora-theme-text);
    font-size: 1.05rem;
}

.theme-option-copy > span {
    color: var(--nardora-theme-muted-text);
    font-size: 0.86rem;
    line-height: 1.4;
}

.theme-option-selected {
    position: absolute;
    top: 20px;
    right: 20px;
    display: none;
    padding: 4px 8px;
    border-radius: 999px;
    background: var(--theme-preview-focus);
    color: #2b190c;
    font-size: 0.68rem;
    font-weight: 900;
    letter-spacing: 0.03em;
    box-shadow: 0 2px 7px rgba(0, 0, 0, 0.38);
}

.theme-option-card.is-selected .theme-option-selected {
    display: inline-flex;
}

#theme-manager-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    padding-top: 4px;
    color: var(--nardora-theme-muted-text);
    font-size: 0.78rem;
}

#theme-manager-close-footer-button {
    min-width: 112px;
    min-height: 44px;
    padding: 9px 18px;
    border: 1px solid var(--nardora-theme-focus);
    border-radius: 9px;
    background: var(--nardora-theme-focus);
    color: #2b190c;
    font: inherit;
    font-weight: 900;
    cursor: pointer;
}

@media (max-width: 900px) {
    #theme-manager-button {
        min-height: 40px;
    }
}

@media (max-width: 600px) and (orientation: portrait) {
    #theme-manager-modal {
        align-items: flex-end;
        padding: 10px max(10px, env(safe-area-inset-right)) max(10px, env(safe-area-inset-bottom)) max(10px, env(safe-area-inset-left));
    }

    #theme-manager-card {
        max-height: calc(100dvh - 20px);
        gap: 14px;
        padding: 18px;
        border-radius: 20px 20px 12px 12px;
    }

    #theme-manager-options {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .theme-option-card {
        display: grid;
        grid-template-columns: minmax(118px, 42%) 1fr;
        align-items: center;
        gap: 12px;
    }

    .theme-option-selected {
        top: 17px;
        right: 17px;
    }

    #theme-manager-footer {
        align-items: stretch;
        flex-direction: column;
    }
}

@media (max-height: 600px) and (orientation: landscape) {
    #theme-manager-modal {
        align-items: flex-start;
        padding: 8px max(8px, env(safe-area-inset-right)) 8px max(8px, env(safe-area-inset-left));
    }

    #theme-manager-card {
        max-height: calc(100dvh - 16px);
        gap: 10px;
        padding: 14px 18px;
        border-radius: 14px;
    }

    #theme-manager-description {
        font-size: 0.82rem;
    }

    .theme-option-preview {
        aspect-ratio: 3 / 1;
    }

    .theme-option-copy > span {
        font-size: 0.76rem;
    }

    #theme-manager-footer {
        font-size: 0.7rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    .theme-option-card {
        transition: none;
    }
}