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

:root {
    --bg-color: #0A0A0A;
    --text-primary: #F5F5F5;
    --text-secondary: #888888;
    --border-color: #333333;
    --hover-bg: #1a1a1a;
    --accent: #ffffff;
    --font-stack: 'Playfair Display', 'Georgia', 'Times New Roman', serif;
}

html, body {
    height: 100%;
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-stack);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 2rem 1rem;
    box-sizing: border-box;
}

main {
    text-align: center;
    max-width: 600px;
    width: 100%;
    max-height: calc(100vh - 4rem);
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}

.view {
    transition: opacity 0.5s ease;
}

.view.hidden {
    display: none;
}

.logo {
    max-width: 100px;
    margin-bottom: 1.5rem;
    display: block;
    margin-left: auto;
    margin-right: auto;
}

h1 {
    font-size: clamp(3rem, 12vw, 5rem);
    font-weight: 700;
    margin-bottom: 0.5rem;
    letter-spacing: 0.1em;
}

h2 {
    font-size: clamp(1.5rem, 5vw, 2rem);
    font-weight: 400;
    margin-bottom: 1rem;
}

.subtitle {
    color: var(--text-secondary);
    font-size: clamp(1rem, 3vw, 1.25rem);
    font-style: italic;
    margin-bottom: 0.5rem;
}

.description {
    color: var(--text-secondary);
    font-size: clamp(0.85rem, 2vw, 1rem);
    margin-bottom: 0.5rem;
    opacity: 0.8;
    line-height: 1.5;
}

.philosophy-link {
    color: var(--text-secondary);
    font-size: 0.9rem;
    opacity: 0.5;
    cursor: pointer;
    margin-bottom: 2rem;
    transition: opacity 0.3s;
}

.philosophy-link:hover {
    opacity: 0.8;
    text-decoration: underline;
}

.button-group {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

button {
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    font-family: var(--font-stack);
    font-size: clamp(0.95rem, 2.5vw, 1.1rem);
    padding: 1rem 2rem;
    cursor: pointer;
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
    min-width: 160px;
}

button:hover {
    background-color: var(--hover-bg);
    border-color: var(--text-secondary);
}

button.primary {
    border-color: var(--accent);
    font-weight: 700;
}

button.secondary {
    border-color: var(--border-color);
    margin-top: 1rem;
}

button.control-btn {
    min-width: 120px;
    padding: 0.75rem 1.5rem;
}

button.preset {
    min-width: auto;
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
    border-color: var(--border-color);
    opacity: 0.7;
}

button.preset:hover {
    opacity: 1;
}

button.text-btn {
    border: none;
    color: var(--text-secondary);
    text-decoration: underline;
    font-size: 0.9rem;
    min-width: auto;
    padding: 0.5rem;
    margin-top: 0.5rem;
}

button.text-btn:hover {
    color: var(--text-primary);
    background: none;
}

.setup-hint {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
    font-style: italic;
}

.input-group {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

input[type="number"] {
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    font-family: var(--font-stack);
    font-size: clamp(1.5rem, 5vw, 2rem);
    padding: 0.75rem 1rem;
    width: 120px;
    text-align: center;
    -moz-appearance: textfield;
}

input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

label {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.preset-buttons {
    display: flex;
    gap: 0.75rem;
    justify-content: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.error {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: 1rem;
    min-height: 1.5rem;
}

.error.visible {
    color: #aa4444;
}

.timer-circle {
    width: 250px;
    height: 250px;
    border: 3px solid var(--border-color);
    border-radius: 50%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    margin: 0 auto 1.5rem;
}

#timer-display {
    font-size: clamp(3rem, 10vw, 4.5rem);
    font-weight: 700;
    letter-spacing: 0.05em;
}

#timer-label {
    color: var(--text-secondary);
    font-size: 1rem;
    margin-top: 0.5rem;
    font-style: italic;
}

.progress-bar {
    width: 100%;
    max-width: 300px;
    height: 4px;
    background: var(--border-color);
    margin: 0 auto 1.5rem;
    border-radius: 2px;
    overflow: hidden;
}

#progress-fill {
    height: 100%;
    background: var(--text-primary);
    width: 0%;
    transition: width 1s linear;
}

.status-msg {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
    font-style: italic;
}

.timer-controls {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.timer-controls button.secondary {
    margin-top: 0;
}

.complete-icon, .paused-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
}

#complete-msg {
    color: var(--text-secondary);
    font-size: 1.1rem;
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.paused-time {
    font-size: clamp(2.5rem, 8vw, 3.5rem);
    font-weight: 700;
    margin-bottom: 1rem;
}

.paused-msg {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.about-content, .philosophy-content {
    text-align: left;
    max-width: 500px;
    margin: 0 auto 1.5rem;
}

.about-content p, .philosophy-content p {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.7;
    margin-bottom: 1rem;
}

.about-content p strong, .philosophy-content p strong {
    color: var(--text-primary);
}

.about-content ul {
    list-style: none;
    margin: 1rem 0 1.5rem 0;
    padding-left: 0;
}

.about-content ul li {
    color: var(--text-secondary);
    padding: 0.25rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.about-content ul li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--text-primary);
}

.philosophy-content {
    text-align: center;
    padding: 1rem 0;
}

.prelude {
    font-size: 0.9rem;
    opacity: 0.5;
    margin-bottom: 1.5rem !important;
}

.quote {
    background: var(--hover-bg);
    border-left: 3px solid var(--text-primary);
    padding: 1rem 1.25rem;
    margin: 1.5rem 0;
    font-style: italic;
    color: var(--text-primary);
}

.mystic {
    font-size: 1.1rem;
    color: var(--text-primary);
    margin: 1.5rem 0;
}

.final {
    font-size: 0.95rem;
    margin-top: 1.5rem !important;
    border-top: 1px solid var(--border-color);
    padding-top: 1rem;
}

.signature {
    margin-top: 1.5rem !important;
    font-size: 0.85rem;
    opacity: 0.4;
}

.philosophy-section {
    padding: 2rem 1rem;
}

.philosophy-section .secondary {
    margin-top: 1.5rem;
}

.philosophy-section .text-btn {
    display: block;
    margin: 1rem auto 0;
}

@media (max-width: 480px) {
    .button-group {
        flex-direction: column;
        align-items: center;
    }

    button {
        width: 100%;
        max-width: 280px;
    }

    .timer-circle {
        width: 200px;
        height: 200px;
    }

    .preset-buttons {
        flex-direction: column;
        align-items: center;
    }

    .preset-buttons button {
        width: auto;
    }

    .philosophy-section {
        padding: 1.5rem 0.5rem;
    }
}