* {
    box-sizing: border-box;
}
:root {
    --color-focus: #60A5FA;
    --color-break: #FF4444;
    --color-text-light: #FFFFFF;
    --color-text-dark: #000000;
    --color-bg: #000000;
    --color-focus-dimmed: rgba(96, 165, 250, 0.5);
    --color-task: #55CCBB;
    --color-task-dimmed: #55CCBB66;
}
body {
    background-color: var(--color-bg);
    color: var(--color-text-light);
    font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
    margin: 0;
    display: flex;
    justify-content: flex-start;
    align-items: center;
    min-height: 100vh;
    flex-direction: column;
    transition: color 0.3s;
    padding-top: 20vh;
}
.text-9xl { font-size: 8rem; line-height: 1; }
.tabular { font-variant-numeric: tabular-nums; }
.text-2xl { font-size: 1.5rem; line-height: 2rem; }
.text-3xl { font-size: 1.875rem; line-height: 2.25rem; }
.font-bold { font-weight: 700; }
.mt-8 { margin-top: 2rem; }
.mb-4 { margin-bottom: 1rem; }
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-row { flex-direction: row; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.btn {
    background-color: var(--color-text-light);
    color: var(--color-text-dark);
    padding: 1rem 2rem;
    font-size: 1.5rem;
    font-weight: bold;
    border: none;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: opacity 0.2s, background-color 0.3s, color 0.3s, border-color 0.3s;
}
.btn:hover {
    opacity: 0.9;
}
.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}
.btn-full {
    width: 100%;
    margin: 0;
}
.w-full {
    width: 100%;
}
.mt-4 { margin-top: 1rem; }
.invisible {
    visibility: hidden;
}
.btn-break {
    background-color: var(--color-break);
    color: var(--color-text-dark);
}
.btn-focus {
    background-color: var(--color-focus);
    color: var(--color-text-dark);
}
/* Mode Specific Styles */
.mode-break { color: var(--color-break); }
.mode-focus { color: var(--color-focus); }
.btn-outline {
    background-color: transparent;
    color: var(--color-text-light);
    border: 2px solid var(--color-text-light);
}
.btn-outline-focus {
    background-color: transparent;
    color: var(--color-focus);
    border: 2px solid var(--color-focus);
}
.btn-outline-break {
    background-color: transparent;
    color: var(--color-break);
    border: 2px solid var(--color-break);
}
.w-24 { width: 24rem; }
.justify-between { justify-content: space-between; }
.flex-1 { flex: 1; }
.ml-4 { margin-left: 1rem; }
.w-4 { width: 1rem; }
.h-4 { height: 1rem; }
.w-5 { width: 1.25rem; }
.h-5 { height: 1.25rem; }
.w-6 { width: 1.5rem; }
.h-6 { height: 1.5rem; }
.max-w-md { max-width: 28rem; }
.container-outline {
    width: 100%;
    border: 2px solid transparent;
    border-radius: 0.5rem;
    transition: border-color 0.3s;
}
.container-outline-focus {
    border-color: var(--color-focus);
}
.btn-no-border {
    border: none !important;
}
.mr-4 { margin-right: 1rem; }
.space-x-4 > * + * { margin-left: 1rem; }
.list-none::-webkit-details-marker { display: none; }
.list-none { list-style: none; }
.task-list {
    width: 100%;
    margin-top: 1rem;
    padding: 0;
}
.task-item {
    padding: 1rem;
    border: 2px solid var(--color-task-dimmed);
    border-radius: 0.5rem;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    font-size: 1.2rem;
    transition: all 0.2s;
}
.task-done {
    opacity: 0.6;
    border-color: rgba(255, 255, 255, 0.1);
}
.task-active {
    border-color: var(--color-task);
    background-color: rgba(85, 204, 187, 0.1);
    box-shadow: 0 0 10px rgba(85, 204, 187, 0.2);
}
.line-through {
    text-decoration: line-through;
    color: #888;
}
.task-check-btn {
    background: none;
    border: none;
    color: var(--color-task-dimmed);
    cursor: pointer;
    padding: 0;
    margin-right: 1rem;
    display: flex;
    align-items: center;
    transition: color 0.2s;
}
.task-check-btn:hover {
    color: var(--color-task);
}
.task-check-btn.checked {
    color: var(--color-task);
}
.task-play-btn {
    background: none;
    border: none;
    color: var(--color-task-dimmed);
    cursor: pointer;
    padding: 0.5rem;
    margin-left: 0.5rem;
    display: flex;
    align-items: center;
    border-radius: 0.25rem;
    transition: all 0.2s;
}
.task-play-btn:hover {
    color: var(--color-task);
    background-color: rgba(85, 204, 187, 0.1);
}
.task-timer {
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
    font-size: 0.9rem;
    color: var(--color-text-light);
    opacity: 0.6;
    margin-left: 0.5rem;
    min-width: 3.5rem;
    text-align: left;
    font-variant-numeric: tabular-nums;
}
.task-delete-btn {
    background: none;
    border: none;
    color: #666;
    cursor: pointer;
    padding: 0.5rem;
    margin-left: 1rem;
    display: flex;
    align-items: center;
    border-radius: 0.25rem;
    transition: all 0.2s;
}
.task-delete-btn:hover {
    color: var(--color-break);
    background-color: rgba(255, 68, 68, 0.1);
}
.btn-task {
    background-color: var(--color-task);
    color: var(--color-text-dark);
}
.btn-outline-task {
    background-color: transparent;
    color: var(--color-task);
    border: 2px solid var(--color-task);
}
.transition-transform {
    transition: transform 0.2s ease-in-out;
}
.btn-tasks {
    padding: 0.4rem 0.8rem !important;
    font-size: 1rem !important;
}

/* Utility Classes */
.gap-1 { gap: 0.25rem; }
.gap-2 { gap: 0.5rem; }
.gap-3 { gap: 0.75rem; }
.gap-4 { gap: 1rem; }
.justify-end { justify-content: flex-end; }
.items-stretch { align-items: stretch; }
.flex-1 { flex: 1 1 0%; }
.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.text-xs { font-size: 0.75rem; line-height: 1rem; }
.text-sm { font-size: 0.875rem; line-height: 1.25rem; }
.text-center { text-align: center; }
.opacity-60 { opacity: 0.6; }
.opacity-70 { opacity: 0.7; }
.w-16 { width: 4rem; }

.input-task {
    width: 100%;
    background-color: transparent;
    color: var(--color-text-light);
    border: 2px solid var(--color-task);
    border-radius: 0.5rem;
    padding: 1rem;
    font-size: 1.25rem;
    outline: none;
    margin-top: 1rem;
}
.input-task-break {
    border-color: var(--color-break);
}
.input-task-sm {
    padding: 0.5rem 0.75rem;
    font-size: 1rem;
    margin-top: 0;
}
.btn-sm {
    padding: 0.4rem 0.8rem !important;
    font-size: 0.9rem !important;
}
details[open] summary svg {
    transform: rotate(180deg);
}
[x-cloak] { display: none !important; }