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

:root {
    --klauzen-blue: #5BAEF7;
    --klauzen-dark: #0A0E27;
    --klauzen-darker: #060914;
    --klauzen-lighter: #1a1f3a;
    --klauzen-text: #ffffff;
    --klauzen-text-secondary: #a8b2d1;
    --success-green: #00ff00;
    --warning-red: #ff0000;
    --warning-orange: #FFA500;
    --shadow: rgba(91, 174, 247, 0.2);
}

body {
    font-family: 'Inter', sans-serif;
    background: linear-gradient(135deg, var(--klauzen-darker) 0%, var(--klauzen-dark) 50%, var(--klauzen-lighter) 100%);
    min-height: 100vh;
    color: var(--klauzen-text);
    overflow-x: hidden;
}

.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
.app-header {
    background: rgba(10, 14, 39, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 2px solid var(--klauzen-blue);
    padding: 1.5rem 2rem;
    box-shadow: 0 4px 20px var(--shadow);
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo {
    width: 50px;
    height: 50px;
    filter: drop-shadow(0 0 10px var(--klauzen-blue));
}

.app-title {
    font-family: 'Anton', sans-serif;
    font-weight: 300;
    font-size: 2rem;
    color: var(--klauzen-blue);
    letter-spacing: 0.1em;
    text-shadow: 0 0 20px var(--shadow);
}

/* Botão Voltar */
.back-btn {
    position: fixed;
    top: 8rem;
    left: 2rem;
    background: rgba(26, 31, 58, 0.8);
    backdrop-filter: blur(10px);
    border: 2px solid rgba(91, 174, 247, 0.3);
    border-radius: 12px;
    padding: 0.75rem 1.25rem;
    color: var(--klauzen-text);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.3s ease;
    z-index: 1000;
    font-family: 'Inter', sans-serif;
}

.back-btn:hover {
    background: rgba(26, 31, 58, 0.95);
    border-color: var(--klauzen-blue);
    transform: translateX(-5px);
}

.back-icon {
    font-size: 1.5rem;
    line-height: 1;
}

.back-text {
    font-size: 0.9rem;
}

/* Main Content */
.main-content {
    flex: 1;
    max-width: 900px;
    width: 100%;
    margin: 0 auto;
    padding: 1.5rem;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: all 0.3s ease;
}

.main-content.training-mode {
    max-width: 100%;
    padding: 0;
}

/* Control Panel */
.control-panel {
    background: rgba(26, 31, 58, 0.5);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(91, 174, 247, 0.2);
    border-radius: 20px;
    padding: 2rem;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    width: 100%;
    max-width: 600px;
    transition: opacity 0.3s ease;
}

.control-panel.hidden {
    display: none;
}

.section-title {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--klauzen-blue);
    text-align: center;
}

.subsection-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin: 2rem 0 1rem;
    color: var(--klauzen-text);
}

/* Settings Lines */
.settings-line {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
    margin-bottom: 1.25rem;
}

.settings-line-2 {
    grid-template-columns: repeat(2, 1fr);
}

.settings-line-3 {
    grid-template-columns: repeat(3, 1fr);
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.input-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--klauzen-text-secondary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.label-icon {
    font-size: 1rem;
}

.input-field {
    background: var(--klauzen-darker);
    border: 2px solid rgba(91, 174, 247, 0.3);
    border-radius: 10px;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    color: var(--klauzen-text);
    font-weight: 600;
    text-align: center;
    transition: all 0.3s ease;
}

.input-field:focus {
    outline: none;
    border-color: var(--klauzen-blue);
    box-shadow: 0 0 0 3px var(--shadow);
}

.input-field:hover {
    border-color: rgba(91, 174, 247, 0.5);
}

/* Add Series Button */
.add-series-container {
    margin-bottom: 1.25rem;
    text-align: center;
}

.btn-add-series {
    background: rgba(91, 174, 247, 0.15);
    color: var(--klauzen-blue);
    border: 2px dashed var(--klauzen-blue);
    padding: 0.75rem 1.5rem;
    width: 100%;
}

.btn-add-series:hover {
    background: rgba(91, 174, 247, 0.25);
    border-style: solid;
}

.btn-add-series.active {
    background: rgba(91, 174, 247, 0.3);
    border-style: solid;
}

/* Color Settings */
.color-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
    margin-bottom: 1.25rem;
}

.color-input-group {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.color-label {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--klauzen-text-secondary);
}

.color-input {
    width: 80px;
    height: 50px;
    border: 2px solid rgba(91, 174, 247, 0.3);
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.color-input:hover {
    border-color: var(--klauzen-blue);
    transform: scale(1.05);
}

/* Buttons */
.button-container {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    margin-bottom: 1.25rem;
}

.btn {
    padding: 1rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: all 0.3s ease;
    font-family: 'Inter', sans-serif;
}

.btn-icon {
    font-size: 1.2rem;
}

.btn-primary {
    background: var(--klauzen-blue);
    color: var(--klauzen-dark);
    box-shadow: 0 4px 15px rgba(91, 174, 247, 0.4);
}

.btn-primary:hover {
    background: #7EC3FF;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(91, 174, 247, 0.6);
}

.btn-pause {
    background: var(--warning-orange);
    color: white;
    box-shadow: 0 4px 15px rgba(255, 165, 0, 0.4);
}

.btn-pause:hover {
    background: #FFB732;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 165, 0, 0.6);
}

.btn-secondary {
    background: rgba(91, 174, 247, 0.1);
    color: var(--klauzen-blue);
    border: 2px solid var(--klauzen-blue);
}

.btn-secondary:hover {
    background: rgba(91, 174, 247, 0.2);
    transform: translateY(-2px);
}

.btn-download {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    width: 100%;
    padding: 1rem;
    margin-top: 0.75rem;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.btn-download:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Workout Info */
.workout-info {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-bottom: 1.25rem;
}

.info-card {
    background: var(--klauzen-darker);
    border: 2px solid rgba(91, 174, 247, 0.3);
    border-radius: 12px;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.info-label {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--klauzen-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.info-value {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--klauzen-blue);
}

/* Progress */
.progress-container {
    margin-top: 1rem;
}

.progress-bar-wrapper {
    background: var(--klauzen-darker);
    border-radius: 10px;
    height: 40px;
    overflow: hidden;
    border: 2px solid rgba(91, 174, 247, 0.3);
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--klauzen-blue), #7EC3FF);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--klauzen-dark);
    font-weight: 700;
    transition: width 0.3s ease;
    box-shadow: 0 0 20px rgba(91, 174, 247, 0.5);
}

.progress-text {
    text-align: center;
    margin-top: 0.5rem;
    font-size: 0.875rem;
    color: var(--klauzen-text-secondary);
}

/* Timer Section */
.timer-section {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    height: 100%;
}

.timer-section.hidden {
    display: none;
}

.timer-display {
    position: relative;
    width: 100%;
    max-width: 500px;
    aspect-ratio: 1;
    background: rgba(26, 31, 58, 0.5);
    border: 2px solid rgba(91, 174, 247, 0.2);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
}

.timer-svg {
    position: absolute;
    width: 100%;
    height: 100%;
    transform: rotate(-90deg) scaleY(-1);
}

.timer-circle-bg {
    fill: none;
    stroke: var(--klauzen-lighter);
    stroke-width: 28;
}

.timer-circle-progress {
    fill: none;
    stroke: var(--klauzen-blue);
    stroke-width: 28;
    stroke-linecap: round;
    stroke-dasharray: 1131;
    stroke-dashoffset: 0;
    transition: stroke-dashoffset 1s linear;
}

.timer-circle-progress.no-transition {
    transition: none;
}

.timer-text {
    font-size: 160px;
    font-weight: 300;
    color: var(--klauzen-text);
    z-index: 10;
    font-family: 'Anton', sans-serif;
    min-width: 100px;
    text-align: center;
}

/* Animations */
@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

@keyframes glow {
    0%, 100% { box-shadow: 0 0 20px var(--shadow); }
    50% { box-shadow: 0 0 40px var(--shadow), 0 0 60px var(--shadow); }
}

/* Responsive Design */
@media (max-width: 1024px) {
    .main-content.with-timer {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .timer-display {
        max-width: 400px;
    }
    
    .timer-text {
        font-size: 120px;
    }
}

@media (max-width: 768px) {
    .app-header {
        padding: 1rem;
    }
    
    .logo {
        width: 40px;
        height: 40px;
    }
    
    .app-title {
        font-size: 1.5rem;
    }
    
    .main-content {
        padding: 1rem;
    }
    
    .control-panel {
        padding: 1.5rem;
    }
    
    .settings-line-3 {
        grid-template-columns: 1fr;
    }
    
    .settings-line-2 {
        grid-template-columns: 1fr;
    }

    .settings-grid .grid-line-1 {
        grid-column: 1;
    }
    
    .button-container {
        grid-template-columns: 1fr;
    }
    
    .workout-info {
        grid-template-columns: 1fr;
    }
    
    .timer-display {
        max-width: 90vw;
    }
    
    .timer-text {
        font-size: 80px;
    }
    
    .color-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .section-title {
        font-size: 1.25rem;
    }
    
    .timer-text {
        font-size: 60px;
    }
    
    .btn {
        padding: 0.875rem 1rem;
        font-size: 0.9rem;
    }
}