:root {
    --bg: #050814;
    --bg-soft: #0b1020;
    --card-bg: rgba(10, 15, 35, 0.95);
    --accent: #4fd1c5;
    --accent-soft: rgba(79, 209, 197, 0.2);
    --accent-strong: #f56565;
    --text: #f7fafc;
    --text-muted: #a0aec0;
    --border-subtle: rgba(255, 255, 255, 0.08);
    --shadow-soft: 0 20px 50px rgba(0, 0, 0, 0.65);
    --radius-xl: 1.5rem;
    --progress: 0;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

body.tp-body {
    margin: 0;
    min-height: 100vh;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    color: var(--text);
    background:
        radial-gradient(circle at 0% 0%, rgba(79, 209, 197, 0.2), transparent 55%),
        radial-gradient(circle at 100% 100%, rgba(246, 114, 128, 0.2), transparent 55%),
        var(--bg);
}

/* Header */

.tp-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 2rem;
    border-bottom: 1px solid var(--border-subtle);
    backdrop-filter: blur(20px);
    background: linear-gradient(to bottom, rgba(5, 8, 20, 0.95), rgba(5, 8, 20, 0.6));
}

.tp-logo {
    font-weight: 700;
    font-size: 1.1rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text);
    text-decoration: none;
}

.tp-nav a {
    color: var(--text-muted);
    text-decoration: none;
    margin-left: 1rem;
    font-size: 0.9rem;
}

.tp-nav a:hover {
    color: var(--accent);
}

/* Main Layout */

.tp-main {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 3rem 1.5rem 4rem;
}

/* Timer Card */

.timer-card {
    width: min(440px, 100%);
    background: var(--card-bg);
    border-radius: var(--radius-xl);
    padding: 2.2rem 2rem 2rem;
    box-shadow: var(--shadow-soft);
    border: 1px solid var(--border-subtle);
    position: relative;
    overflow: hidden;
}

.timer-card::before {
    content: "";
    position: absolute;
    inset: -30%;
    background:
        radial-gradient(circle at 0% 0%, rgba(79, 209, 197, 0.12), transparent 60%),
        radial-gradient(circle at 100% 100%, rgba(246, 114, 128, 0.12), transparent 60%);
    opacity: 0.9;
    z-index: -1;
}

.timer-title {
    margin: 0;
    font-size: 1.3rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text);
}

.timer-subtitle {
    margin: 0.4rem 0 1.6rem;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.timer-subtitle span {
    color: var(--accent);
    font-weight: 600;
}

/* Circular Timer */

.timer-circle {
    width: 230px;
    height: 230px;
    margin: 0 auto 1.8rem;
    border-radius: 50%;
    background:
        radial-gradient(circle at 30% 10%, rgba(255, 255, 255, 0.12), transparent 60%),
        conic-gradient(
            var(--accent) calc(var(--progress) * 360deg),
            rgba(255, 255, 255, 0.04) 0
        );
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 4px;
    position: relative;
}

.timer-circle::after {
    content: "";
    position: absolute;
    inset: 10px;
    border-radius: 50%;
    border: 1px solid rgba(255, 255, 255, 0.06);
}

.timer-circle-inner {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: radial-gradient(circle at 30% 10%, #141a33, #050814);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    box-shadow:
        inset 0 0 35px rgba(0, 0, 0, 0.9),
        0 0 20px rgba(79, 209, 197, 0.25);
}

.time-display {
    font-size: 2.8rem;
    font-variant-numeric: tabular-nums;
    letter-spacing: 0.08em;
}

.mode-display {
    margin-top: 0.3rem;
    font-size: 0.8rem;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: var(--text-muted);
}

/* Controls */

.controls {
    display: flex;
    gap: 0.75rem;
    justify-content: center;
    margin-bottom: 1.3rem;
}

.btn {
    border: none;
    border-radius: 999px;
    padding: 0.6rem 1.6rem;
    font-size: 0.95rem;
    cursor: pointer;
    font-weight: 500;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    transition: transform 0.1s ease, box-shadow 0.1s ease, background 0.15s ease, color 0.15s ease;
}

.btn.primary {
    background: linear-gradient(135deg, var(--accent), #63b3ed);
    color: #050814;
    box-shadow: 0 10px 30px rgba(79, 209, 197, 0.45);
}

.btn.primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 15px 35px rgba(79, 209, 197, 0.55);
}

.btn.ghost {
    background: transparent;
    color: var(--text-muted);
    border: 1px solid var(--border-subtle);
}

.btn.ghost:hover {
    background: rgba(255, 255, 255, 0.03);
    color: var(--text);
}

/* Presets */

.presets {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 0.9rem;
}

.chip {
    border-radius: 999px;
    border: 1px solid rgba(255, 255, 255, 0.12);
    padding: 0.25rem 0.7rem;
    background: rgba(255, 255, 255, 0.02);
    cursor: pointer;
    font-size: 0.8rem;
    color: var(--text-muted);
    transition: background 0.12s ease, color 0.12s ease, border-color 0.12s ease, transform 0.08s ease;
}

.chip:hover {
    background: rgba(255, 255, 255, 0.06);
    color: var(--accent);
    transform: translateY(-1px);
}

.chip.active {
    background: var(--accent-soft);
    color: var(--accent);
    border-color: var(--accent);
}

/* Hint */

.hint {
    font-size: 0.75rem;
    color: var(--text-muted);
    opacity: 0.85;
}

/* Responsive */

@media (max-width: 600px) {
    .tp-header {
        padding: 0.8rem 1.2rem;
    }

    .timer-card {
        padding: 1.8rem 1.3rem 1.5rem;
    }

    .timer-circle {
        width: 210px;
        height: 210px;
    }

    .time-display {
        font-size: 2.5rem;
    }
}