:root {
    --bg-color: #0f172a;
    --text-color: #e2e8f0;
    --primary-color: #38bdf8;
    --secondary-color: #1e293b;
    --accent-color: #818cf8;
    --success-color: #4ade80;
    --font-family: 'Nunito', sans-serif;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-color);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}

.calm-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 50% 50%, #1e293b 0%, #0f172a 100%);
    z-index: -1;
}

.container {
    text-align: center;
    width: 90%;
    max-width: 400px;
}

header h1 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

header p {
    color: #94a3b8;
    margin-bottom: 2rem;
}

.timer-circle-container {
    position: relative;
    width: 300px;
    height: 300px;
    margin: 0 auto 2rem;
}

.timer-svg {
    transform: rotate(-90deg);
    width: 100%;
    height: 100%;
}

.timer-bg {
    fill: none;
    stroke: var(--secondary-color);
    stroke-width: 5;
}

.timer-progress {
    fill: none;
    stroke: var(--primary-color);
    stroke-width: 5;
    stroke-linecap: round;
    stroke-dasharray: 283;
    /* 2 * PI * 45 */
    stroke-dashoffset: 0;
    transition: stroke-dashoffset 1s linear, stroke 0.5s ease;
}

.timer-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    display: flex;
    flex-direction: column;
    align-items: center;
}

#time-display {
    font-size: 3.5rem;
    font-weight: 700;
}

#status-text {
    font-size: 1rem;
    color: #94a3b8;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.controls {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 2rem;
}

button {
    font-family: var(--font-family);
    font-size: 1rem;
    padding: 0.8rem 2rem;
    border-radius: 50px;
    border: none;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.btn-primary {
    background: var(--primary-color);
    color: #0f172a;
    font-weight: 700;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 15px rgba(56, 189, 248, 0.4);
}

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

.btn-secondary:hover {
    background: var(--secondary-color);
}

.settings {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 2rem;
    color: #94a3b8;
}

.toggle-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.glass-panel {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    padding: 1.5rem;
    border-radius: 16px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    margin-top: 1rem;
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hidden {
    display: none;
}

.text-btn {
    background: none;
    color: #64748b;
    font-size: 0.9rem;
    padding: 0;
    text-decoration: underline;
}

.text-btn:hover {
    color: var(--text-color);
}

/* Break Mode Styles */
body.break-mode {
    background-color: #064e3b;
    /* Dark Green */
}

body.break-mode .timer-progress {
    stroke: var(--success-color);
}

body.break-mode header h1 {
    color: var(--success-color);
}