:root {
    /* Brand: primary 0xFF5B53A8, secondary 0xFF5F5C71, surface 0xFF47464F */
    color-scheme: dark;
    --primary: #5b53a8;
    --secondary: #5f5c71;
    --surface: #47464f;

    --bg: #323139;
    --bg-accent: #3d3c45;
    --border: #5a5865;
    --border-soft: #54525c;
    --text: #ecebf0;
    --muted: #a9a7b8;
    --accent: var(--primary);
    --accent-bright: #7b74c4;
    --accent-deep: #4a4390;
    --accent-dark: #3d3678;
    --accent-soft: rgba(91, 83, 168, 0.22);
    --accent-glow: rgba(123, 116, 196, 0.42);
    --done-green-bright: #4ade80;
    --done-green: #22c55e;
    --done-green-deep: #15803d;
    --danger: #f87171;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.25);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.35);
    --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.45);
    --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
    --ease-spring: cubic-bezier(0.34, 1.3, 0.64, 1);
}

@keyframes bg-drift {
    0%, 100% { opacity: 1; transform: scale(1) translate(0, 0); }
    50% { opacity: 0.92; transform: scale(1.03) translate(1%, -1%); }
}
@keyframes rise-in {
    from {
        opacity: 0;
        transform: translateY(1.1rem) scale(0.985);
        filter: blur(4px);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
        filter: blur(0);
    }
}
@keyframes logo-in {
    from {
        opacity: 0;
        transform: scale(0.88) rotate(-6deg);
    }
    to {
        opacity: 1;
        transform: scale(1) rotate(0deg);
    }
}
@keyframes fade-up {
    from { opacity: 0; transform: translateY(0.6rem); }
    to { opacity: 1; transform: translateY(0); }
}
@keyframes site-bar-in {
    from { opacity: 0; transform: translateY(-0.5rem); }
    to { opacity: 1; transform: translateY(0); }
}
@keyframes todo-row-in {
    from {
        opacity: 0;
        transform: translateX(-0.5rem);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}
@keyframes shimmer {
    0% { background-position: -120% 0; }
    100% { background-position: 220% 0; }
}

* { box-sizing: border-box; }

body {
    margin: 0;
    min-height: 100vh;
    font-family: "Manrope", system-ui, sans-serif;
    color: var(--text);
    line-height: 1.55;
    background-color: var(--bg);
    background-image:
        radial-gradient(ellipse 100% 70% at 85% -15%, rgba(91, 83, 168, 0.28) 0%, transparent 52%),
        radial-gradient(ellipse 80% 55% at 5% 105%, rgba(95, 92, 113, 0.35) 0%, transparent 48%),
        radial-gradient(ellipse 60% 40% at 50% 50%, rgba(255, 255, 255, 0.04) 0%, transparent 65%),
        linear-gradient(168deg, #2e2d35 0%, var(--bg) 42%, #2a2930 100%);
    background-attachment: fixed;
}
body::before {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    background: radial-gradient(ellipse 90% 50% at 50% 0%, rgba(91, 83, 168, 0.12) 0%, transparent 55%);
    animation: bg-drift 18s var(--ease-out) infinite;
    z-index: 0;
}

.site-top {
    position: relative;
    z-index: 1;
    max-width: 32rem;
    margin: 0 auto;
    padding: 1.35rem 1.25rem 0;
    animation: site-bar-in 0.55s var(--ease-out) both;
}
.site-home {
    display: inline-flex;
    align-items: center;
    text-decoration: none;
    border-radius: 0.75rem;
    padding: 0.2rem;
    margin: -0.2rem;
    transition:
        transform 0.35s var(--ease-spring),
        box-shadow 0.35s ease;
}
.site-home:hover {
    transform: scale(1.06) rotate(-2deg);
}
.site-home:active {
    transform: scale(0.97);
}
.site-home:focus-visible {
    outline: 2px solid var(--accent-bright);
    outline-offset: 4px;
}
.site-home img {
    width: 2.35rem;
    height: 2.35rem;
    border-radius: 0.55rem;
    box-shadow:
        var(--shadow-md),
        0 0 0 1px rgba(255, 255, 255, 0.08) inset;
}

main {
    position: relative;
    z-index: 1;
    max-width: 32rem;
    margin: 0 auto;
    padding: 1rem 1.25rem 2.5rem;
}

.site-footer {
    position: relative;
    z-index: 1;
    max-width: 32rem;
    margin: 0 auto;
    padding: 0 1.25rem 2.25rem;
    text-align: center;
}
.site-footer-text {
    margin: 0;
    font-size: 0.875rem;
    line-height: 1.5;
    color: var(--muted);
}
.site-footer-tagline {
    color: var(--muted);
    font-weight: 400;
}
.site-footer-link {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--muted);
    text-decoration: none;
    transition: color 0.2s ease, text-decoration-color 0.2s ease;
}
.site-footer-link:hover {
    color: var(--accent-bright);
}
.site-footer-link:focus-visible {
    color: var(--accent-bright);
    outline: 2px solid var(--accent-bright);
    outline-offset: 4px;
    border-radius: 0.25rem;
}

.panel {
    position: relative;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 1.25rem;
    padding: 1.85rem 1.6rem;
    box-shadow: var(--shadow-lg);
    animation: rise-in 0.65s var(--ease-out) both;
    overflow: hidden;
}
.panel::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--secondary), var(--accent-deep), var(--accent-bright));
    opacity: 0.85;
    border-radius: 1.25rem 1.25rem 0 0;
}

.panel.task-board {
    transition:
        background 0.5s var(--ease-out),
        border-color 0.5s var(--ease-out),
        box-shadow 0.5s ease;
}
.panel.task-board--all-done {
    background:
        linear-gradient(
            165deg,
            rgba(74, 222, 128, 0.14) 0%,
            var(--surface) 42%,
            rgba(21, 128, 61, 0.14) 100%
        );
    border-color: rgba(74, 222, 128, 0.32);
    box-shadow:
        var(--shadow-lg),
        0 0 32px rgba(34, 197, 94, 0.12),
        0 0 0 1px rgba(74, 222, 128, 0.12) inset;
}
.panel.task-board--all-done::before {
    background: linear-gradient(
        90deg,
        var(--done-green-deep),
        var(--done-green),
        var(--done-green-bright)
    );
    opacity: 1;
}

h1 {
    font-family: "Literata", Georgia, serif;
    font-weight: 600;
    font-size: 1.75rem;
    margin: 0 0 0.75rem;
    letter-spacing: -0.025em;
    color: var(--text);
}

.landing-brand {
    display: flex;
    align-items: center;
    gap: 1.1rem;
    margin-bottom: 0.35rem;
}
.landing-brand h1 {
    margin: 0;
    font-size: 2.1rem;
    animation: fade-up 0.55s var(--ease-out) 0.12s both;
}
.landing-logo {
    flex-shrink: 0;
    width: 5.25rem;
    height: 5.25rem;
    border-radius: 1.15rem;
    box-shadow:
        var(--shadow-md),
        0 0 0 1px rgba(255, 255, 255, 0.06) inset;
    animation: logo-in 0.75s var(--ease-out) both;
}

.landing .lede {
    animation: fade-up 0.55s var(--ease-out) 0.22s both;
}
.landing .btn.primary {
    animation: fade-up 0.55s var(--ease-out) 0.32s both;
}
.landing .meta {
    animation: fade-up 0.55s var(--ease-out) 0.4s both;
}

.lede {
    color: var(--muted);
    margin: 0 0 1.5rem;
    font-size: 1.02rem;
}

.muted { color: var(--muted); }
.meta {
    margin: 1rem 0 0;
    font-size: 0.875rem;
    color: var(--muted);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.72rem 1.35rem;
    border-radius: 0.65rem;
    font-weight: 600;
    font-size: 0.95rem;
    text-decoration: none;
    transition:
        transform 0.3s var(--ease-spring),
        box-shadow 0.3s ease;
}
.btn.primary {
    position: relative;
    overflow: hidden;
    color: #fff;
    /* Teal-dominant fill for contrast; cyan reads in glow + shimmer */
    background: linear-gradient(135deg, var(--accent-bright) 0%, var(--accent) 45%, var(--accent-dark) 100%);
    box-shadow:
        0 4px 20px var(--accent-glow),
        0 0 0 1px rgba(255, 255, 255, 0.12) inset,
        var(--shadow);
}
.btn.primary::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(
        105deg,
        transparent 0%,
        rgba(255, 255, 255, 0.35) 45%,
        transparent 55%
    );
    background-size: 200% 100%;
    animation: shimmer 4s ease-in-out infinite;
    pointer-events: none;
}
.btn.primary:hover {
    transform: translateY(-2px);
    box-shadow:
        0 10px 28px var(--accent-glow),
        0 4px 12px rgba(0, 0, 0, 0.35);
}
.btn.primary:active {
    transform: translateY(0) scale(0.98);
}

.empty-state h1 {
    color: var(--danger);
}

.task-header {
    margin: -0.15rem 0 1.35rem;
    padding-bottom: 1.2rem;
    border-bottom: 1px solid var(--border-soft);
}
.task-title {
    margin: 0 0 0.4rem;
    font-size: 1.55rem;
    line-height: 1.25;
    letter-spacing: -0.03em;
    animation: fade-up 0.5s var(--ease-out) 0.08s both;
}
.task-hint {
    margin: 0;
    font-size: 0.8rem;
    font-weight: 500;
    letter-spacing: 0.02em;
    text-transform: uppercase;
    color: var(--muted);
    opacity: 0.85;
    animation: fade-up 0.5s var(--ease-out) 0.14s both;
}

.todo-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 0.7rem;
}

.todo-item {
    --i: 0;
    position: relative;
    margin: 0;
    border-radius: 0.9rem;
    overflow: hidden;
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.05) 0%, rgba(255, 255, 255, 0.02) 100%);
    border: 1px solid var(--border-soft);
    box-shadow: var(--shadow);
    animation: todo-row-in 0.45s var(--ease-out) backwards;
    animation-delay: calc(0.04s * var(--i) + 0.1s);
    transition:
        border-color 0.35s var(--ease-out),
        background 0.35s var(--ease-out),
        box-shadow 0.35s ease,
        opacity 0.35s ease;
}
.todo-item::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    border-radius: 0.9rem 0 0 0.9rem;
    background: linear-gradient(180deg, var(--accent-bright) 0%, var(--accent) 55%, var(--accent-deep) 100%);
    opacity: 0.95;
    transition: opacity 0.35s ease, background 0.35s ease;
}
.todo-item.done {
    background: linear-gradient(145deg, rgba(95, 92, 113, 0.35) 0%, rgba(71, 70, 79, 0.65) 100%);
    border-color: rgba(95, 92, 113, 0.55);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
    opacity: 0.92;
}
.todo-item.done::before {
    background: linear-gradient(
        180deg,
        var(--done-green-bright) 0%,
        var(--done-green) 50%,
        var(--done-green-deep) 100%
    );
    opacity: 0.95;
}

.todo-row {
    position: relative;
    display: block;
    width: 100%;
    margin: 0;
    padding: 1rem 1.15rem 1rem 1.2rem;
    cursor: pointer;
    border-radius: inherit;
    transition: background 0.2s ease;
}
.todo-row:focus-within {
    outline: none;
}
.todo-item:focus-within {
    box-shadow:
        var(--shadow),
        0 0 0 2px var(--bg),
        0 0 0 4px var(--accent-bright);
}
.todo-item.done:focus-within {
    box-shadow:
        0 2px 8px rgba(0, 0, 0, 0.2),
        0 0 0 2px var(--bg),
        0 0 0 4px rgba(123, 116, 196, 0.55);
}

.todo-check-input {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}
.todo-item:has(.todo-check-input:disabled) {
    pointer-events: none;
    opacity: 0.62;
}
.todo-item:has(.todo-check-input:disabled) .todo-row {
    cursor: wait;
}

.todo-item.done .todo-row::after {
    content: "";
    position: absolute;
    right: 1rem;
    top: 50%;
    width: 0.45rem;
    height: 0.75rem;
    margin-top: -0.45rem;
    border: solid var(--done-green-bright);
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
    opacity: 0.5;
    pointer-events: none;
}

.todo-body {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    min-width: 0;
    padding-right: 1.75rem;
    transition: opacity 0.3s ease;
}
.todo-item.done .todo-body {
    padding-right: 2.15rem;
}
.todo-title {
    font-size: 1.02rem;
    font-weight: 600;
    line-height: 1.35;
    letter-spacing: -0.02em;
    transition:
        color 0.35s var(--ease-out),
        text-decoration-color 0.35s ease,
        font-weight 0.25s ease;
}
.todo-item.done .todo-title {
    font-weight: 500;
    text-decoration: line-through;
    text-decoration-thickness: 2px;
    text-decoration-color: rgba(169, 167, 184, 0.55);
    color: var(--muted);
}
.todo-desc {
    font-size: 0.875rem;
    line-height: 1.45;
    color: var(--muted);
    transition: color 0.35s ease, text-decoration-color 0.35s ease;
}
.todo-item.done .todo-desc {
    color: rgba(169, 167, 184, 0.75);
    text-decoration: line-through;
    text-decoration-thickness: 1px;
    text-decoration-color: rgba(169, 167, 184, 0.35);
}

@media (prefers-reduced-motion: reduce) {
    body::before {
        animation: none;
    }
    .btn.primary::after {
        animation: none;
    }
    .panel,
    .site-top,
    .landing-logo,
    .landing-brand h1,
    .landing .lede,
    .landing .btn.primary,
    .landing .meta,
    .task-header h1,
    .todo-item {
        animation: none;
    }
    .site-home,
    .btn,
    .panel.task-board,
    .todo-item,
    .todo-title,
    .todo-desc {
        transition-duration: 0.05s;
    }
}