/* Reset e Variáveis */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #4A90E2;
    --secondary-color: #50C878;
    --danger-color: #E74C3C;
    --warning-color: #F39C12;
    --dark: #2C3E50;
    --light: #ECF0F1;
    --gray: #95A5A6;
    --white: #FFFFFF;
    --shadow: 0 2px 8px rgba(0,0,0,0.1);
    --shadow-hover: 0 4px 12px rgba(0,0,0,0.15);
    --border-radius: 12px;
    --transition: all 0.3s ease;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: var(--dark);
    line-height: 1.6;
    padding-bottom: 2rem;
}

/* Header */
.header {
    background: var(--white);
    padding: 2rem 1rem;
    text-align: center;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
}

.header h1 {
    font-size: 1.8rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.subtitle {
    color: var(--gray);
    font-size: 0.95rem;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* Dashboard */
.dashboard {
    margin-bottom: 2rem;
}

.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    padding: 0 1rem;
}

/* Cards */
.card {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

.card h3 {
    color: var(--dark);
    font-size: 1rem;
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 600;
}

/* Countdown */
.countdown {
    font-size: 3rem;
    font-weight: bold;
    color: var(--primary-color);
    text-align: center;
    margin: 1rem 0;
}

.exam-date {
    text-align: center;
    color: var(--gray);
    font-size: 0.9rem;
}

/* Progress Circle */
.progress-circle {
    position: relative;
    width: 150px;
    height: 150px;
    margin: 1rem auto;
}

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

.progress-bg {
    fill: none;
    stroke: var(--light);
    stroke-width: 8;
}

.progress-bar {
    fill: none;
    stroke: var(--secondary-color);
    stroke-width: 8;
    stroke-linecap: round;
    stroke-dasharray: 283;
    stroke-dashoffset: 283;
    transition: stroke-dashoffset 1s ease;
}

.progress-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 2rem;
    font-weight: bold;
    color: var(--primary-color);
}

.progress-info {
    text-align: center;
    color: var(--gray);
    font-size: 0.9rem;
}

/* Timer */
.timer {
    font-size: 2.5rem;
    font-weight: bold;
    text-align: center;
    color: var(--dark);
    margin: 1rem 0;
    font-variant-numeric: tabular-nums;
}

.timer-controls {
    display: flex;
    gap: 0.5rem;
    margin-top: 1rem;
}

.daily-goal {
    text-align: center;
    color: var(--gray);
    font-size: 0.9rem;
    margin-top: 0.5rem;
}

/* Stats */
.stats {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.stat-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--light);
}

.stat-item:last-child {
    border-bottom: none;
}

.stat-label {
    color: var(--gray);
    font-size: 0.9rem;
}

.stat-value {
    color: var(--dark);
    font-weight: 600;
    font-size: 1rem;
}

/* Buttons */
.btn {
    padding: 0.75rem 1.25rem;
    border: none;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    flex: 1;
    text-align: center;
}

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

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

.btn-primary:hover:not(:disabled) {
    background: #3a7bc8;
    transform: translateY(-1px);
}

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

.btn-secondary:hover:not(:disabled) {
    background: #7f8c8d;
}

.btn-danger {
    background: var(--danger-color);
    color: var(--white);
}

.btn-danger:hover {
    background: #c0392b;
}

/* Tabs */
.tabs {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    padding: 0 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.tab {
    padding: 0.75rem 1.5rem;
    background: var(--white);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    color: var(--gray);
    transition: var(--transition);
    box-shadow: var(--shadow);
}

.tab:hover {
    background: var(--light);
}

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

/* Tab Content */
.tab-content {
    display: none;
}

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

/* Filters */
.filters {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 0.5rem 1rem;
    background: var(--white);
    border: 2px solid var(--light);
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: var(--transition);
    color: var(--dark);
}

.filter-btn:hover {
    border-color: var(--primary-color);
}

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

/* Schedule List */
.schedule-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.schedule-item {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 1.25rem;
    box-shadow: var(--shadow);
    transition: var(--transition);
    cursor: pointer;
    border-left: 4px solid var(--primary-color);
}

.schedule-item:hover {
    transform: translateX(4px);
    box-shadow: var(--shadow-hover);
}

.schedule-item.completed {
    opacity: 0.7;
    border-left-color: var(--secondary-color);
}

.schedule-item.overdue {
    border-left-color: var(--danger-color);
}

.schedule-item.weekend {
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    opacity: 0.85;
    border-left-color: var(--gray);
}

.schedule-item.weekend:hover {
    opacity: 1;
}

.schedule-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

.schedule-date {
    font-weight: 600;
    color: var(--dark);
    font-size: 1rem;
}

.schedule-block {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--primary-color);
    color: var(--white);
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
}

.schedule-content {
    color: var(--dark);
    line-height: 1.5;
    margin-bottom: 0.75rem;
}

.schedule-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.schedule-checkbox {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
}

.schedule-checkbox input[type="checkbox"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
}

.schedule-status {
    font-size: 0.85rem;
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-weight: 600;
}

.status-pending {
    background: #FFF3CD;
    color: #856404;
}

.status-completed {
    background: #D4EDDA;
    color: #155724;
}

.status-overdue {
    background: #F8D7DA;
    color: #721C24;
}

/* Materials */
.materials-grid {
    display: grid;
    gap: 1.5rem;
}

.material-card {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
}

.material-card h3 {
    color: var(--dark);
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.material-links {
    list-style: none;
}

.material-links li {
    margin-bottom: 0.75rem;
}

.material-links a {
    color: var(--primary-color);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
    padding: 0.5rem;
    border-radius: 6px;
}

.material-links a:hover {
    background: var(--light);
    transform: translateX(4px);
}

.material-links a::before {
    content: "→";
    font-weight: bold;
}

/* Block Links */
.block-links {
    display: grid;
    gap: 0.75rem;
}

.block-link-btn {
    padding: 0.75rem;
    background: var(--light);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    text-align: left;
    transition: var(--transition);
    font-weight: 500;
    color: var(--dark);
}

.block-link-btn:hover {
    background: var(--primary-color);
    color: var(--white);
    transform: translateX(4px);
}

/* Blocks Grid */
.blocks-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.block-card {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
}

.block-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.block-title {
    font-size: 1.2rem;
    color: var(--dark);
    font-weight: 600;
}

.block-progress {
    font-size: 0.9rem;
    color: var(--gray);
}

.block-bar {
    height: 8px;
    background: var(--light);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 1rem;
}

.block-bar-fill {
    height: 100%;
    background: var(--secondary-color);
    transition: width 0.5s ease;
}

.block-days {
    font-size: 0.9rem;
    color: var(--gray);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    backdrop-filter: blur(4px);
}

.modal.active {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 1rem;
}

.modal-content {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 2rem;
    max-width: 600px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.close {
    position: absolute;
    right: 1.5rem;
    top: 1.5rem;
    font-size: 2rem;
    font-weight: bold;
    color: var(--gray);
    cursor: pointer;
    transition: var(--transition);
}

.close:hover {
    color: var(--danger-color);
}

.modal-body h2 {
    color: var(--dark);
    margin-bottom: 1.5rem;
}

.modal-block {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: var(--primary-color);
    color: var(--white);
    border-radius: 20px;
    font-weight: 600;
    margin-bottom: 1rem;
}

.modal-topic {
    color: var(--dark);
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    color: var(--dark);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--light);
    border-radius: 8px;
    font-family: inherit;
    font-size: 1rem;
    resize: vertical;
    transition: var(--transition);
}

.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-group input[type="checkbox"] {
    width: 20px;
    height: 20px;
    margin-right: 0.5rem;
    cursor: pointer;
}

/* Responsive */
@media (max-width: 768px) {
    .header h1 {
        font-size: 1.5rem;
    }

    .dashboard-grid {
        grid-template-columns: 1fr;
    }

    .countdown {
        font-size: 2.5rem;
    }

    .timer {
        font-size: 2rem;
    }

    .timer-controls {
        flex-direction: column;
    }

    .tabs {
        flex-direction: column;
    }

    .tab {
        width: 100%;
    }

    .modal-content {
        padding: 1.5rem;
    }
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--light);
}

::-webkit-scrollbar-thumb {
    background: var(--gray);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-color);
}