@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;600;700&display=swap');

:root {
    --primary-color: #4a90e2;
    --secondary-color: #f5a623;
    --background-color: #f0f4f8;
    --card-background: #ffffff;
    --text-color: #333;
    --light-text-color: #777;
    --border-color: #e0e0e0;
    --success-color: #50e3c2;
    --danger-color: #d0021b;
}

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

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
    padding: 20px;
}

.screen {
    display: none;
    width: 100%;
    max-width: 500px;
    flex-direction: column;
    gap: 20px;
}

.screen.active {
    display: flex;
}

h1 {
    color: var(--primary-color);
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 10px;
}

.card {
    background-color: var(--card-background);
    border-radius: 12px;
    padding: 25px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
}

.card h2 {
    font-size: 1.4rem;
    margin-bottom: 20px;
    color: var(--primary-color);
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 10px;
}

/* Duration Selector */
.duration-selector {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

#duration-slider {
    width: 100%;
    cursor: pointer;
}

.duration-input-container {
    display: flex;
    align-items: center;
    gap: 5px;
    align-self: center;
}

.time-separator {
    font-size: 1.5rem;
    font-weight: 600;
}

.time-input-group {
    display: flex;
    align-items: baseline;
    gap: 5px;
}

.time-input-group input {
    width: 60px;
    padding: 8px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    text-align: center;
    font-size: 1.2rem;
    font-weight: 600;
}

.time-input-group label {
    font-size: 1rem;
    color: var(--light-text-color);
}

.time-input {
    display: flex;
    align-items: center;
    gap: 5px;
}

.time-input input {
    width: 60px;
    padding: 8px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    text-align: center;
    font-size: 1.2rem;
    font-weight: 600;
}

.time-input label {
    font-weight: 400;
    color: var(--light-text-color);
}

.time-separator {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--light-text-color);
    padding-bottom: 5px;
}

/* Structure Options */
.structure-options {
    display: flex;
    margin-bottom: 20px;
}

.tab-btn {
    flex: 1;
    padding: 12px;
    border: none;
    background-color: #e9ecef;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: background-color 0.3s, color 0.3s;
}

.tab-btn:first-child {
    border-top-left-radius: 8px;
    border-bottom-left-radius: 8px;
}

.tab-btn:last-child {
    border-top-right-radius: 8px;
    border-bottom-right-radius: 8px;
}

.tab-btn.active {
    background-color: var(--primary-color);
    color: white;
}

.mode-content {
    display: none;
}

.mode-content.active {
    display: block;
}

#preset-list {
    padding-left: 20px;
    columns: 2;
    color: var(--light-text-color);
}

#preset-list li {
    margin-bottom: 8px;
}

/* Custom Mode */
#custom-list-container p {
    text-align: center;
    color: var(--light-text-color);
    margin-bottom: 15px;
}

.custom-set-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: 10px;
    background-color: #f8f9fa;
}

.custom-set-actions button {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1rem;
    margin-left: 10px;
    color: var(--light-text-color);
}

.custom-set-actions button:hover {
    color: var(--primary-color);
}

.custom-set-editor-container {
    display: none; /* Hidden by default */
    flex-direction: column;
    gap: 15px;
    margin-top: 20px;
    padding: 15px;
    border: 1px dashed var(--border-color);
    border-radius: 8px;
}

#custom-set-name, #new-step-input {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
}

.add-step-container {
    display: flex;
    gap: 10px;
}

#new-step-input {
    flex-grow: 1;
}

#add-step-btn {
    padding: 0 20px;
    background-color: var(--secondary-color);
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
}

#custom-steps-list .step {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px;
    background-color: #f1f3f5;
    border-radius: 6px;
    margin-bottom: 5px;
    cursor: grab;
}

#custom-steps-list .step .remove-step-btn {
    background: none; border: none; color: var(--danger-color); cursor: pointer;
}

.editor-actions {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

.editor-actions button {
    padding: 10px 15px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 1.2rem;
}

#save-set-btn { background-color: var(--success-color); color: white; }
#delete-set-btn { background-color: var(--danger-color); color: white; }
#close-editor-btn { background-color: var(--light-text-color); color: white; }

#new-set-btn, #start-btn {
    width: 100%;
    padding: 15px;
    font-size: 1.2rem;
    font-weight: 600;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    margin-top: 10px;
    transition: background-color 0.3s;
}

#new-set-btn:hover, #start-btn:hover {
    background-color: #3a7ac8;
}

/* Timer Screen */
#timer-screen {
    align-items: center;
    flex-direction: column;
}

.timer-container {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    margin-bottom: 20px;
}

.timer-text {
    text-align: center;
    margin-top: 20px;
}

#segment-title {
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.countdown-prominent {
    font-size: 3.5rem;
    font-weight: 600;
    margin: 10px 0;
}

#total-countdown {
    font-size: 1rem;
    color: var(--light-text-color);
}

.timer-controls {
    display: flex;
    gap: 20px;
    margin-top: 30px;
}

.timer-controls button {
    background: var(--card-background);
    border: none;
    border-radius: 50%;
    width: 60px;
    height: 60px;
    font-size: 1.5rem;
    cursor: pointer;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
    color: var(--primary-color);
    transition: transform 0.2s;
}

.timer-controls button:hover {
    transform: scale(1.1);
}

/* Completion Screen */
#completion-screen {
    text-align: center;
    align-items: center;
}

.quote {
    font-size: 1.1rem;
    font-style: italic;
    margin-top: 20px;
    max-width: 400px;
}

.quote-ref {
    font-size: 1rem;
    color: var(--light-text-color);
    margin-top: 10px;
    margin-bottom: 30px;
}

.completion-actions button {
    padding: 12px 25px;
    font-size: 1rem;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    margin: 0 10px;
}

#restart-btn { background-color: var(--primary-color); color: white; }
#return-home-btn { background-color: var(--light-text-color); color: white; }

/* Responsive */
@media (max-width: 480px) {
    body { padding: 10px; }
    h1 { font-size: 2rem; }
    .card { padding: 20px; }
    #preset-list { columns: 1; }
}