/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
}

/* Header */
header {
    text-align: center;
    margin-bottom: 30px;
}

header h1 {
    color: white;
    font-size: 2.5rem;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.breadcrumb {
    margin-top: 15px;
}

.back-btn {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.3);
    padding: 8px 16px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
}

.back-btn:hover {
    background: rgba(255, 255, 255, 0.3);
    border-color: rgba(255, 255, 255, 0.5);
}

/* Views */
.view {
    display: none;
}

.view.active {
    display: block;
}

.view h2 {
    color: white;
    text-align: center;
    margin-bottom: 25px;
    font-size: 1.8rem;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.3);
}

/* Skills Grid */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    max-width: 900px;
    margin: 0 auto;
}

.skill-card {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 12px;
    padding: 25px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
}

.skill-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
    background: rgba(255, 255, 255, 1);
}

.skill-icon {
    width: 48px;
    height: 48px;
    margin-bottom: 15px;
    border-radius: 6px;
}

.skill-card h3 {
    font-size: 1.2rem;
    color: #333;
    margin: 0;
}

/* Activities List */
.activities-list {
    max-width: 800px;
    margin: 0 auto;
    display: grid;
    gap: 15px;
}

.activity-card {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 10px;
    padding: 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    display: grid;
    grid-template-columns: auto 1fr auto auto auto;
    align-items: center;
    gap: 15px;
    backdrop-filter: blur(10px);
}

.activity-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    background: rgba(255, 255, 255, 1);
}

.activity-icon {
    width: 32px;
    height: 32px;
    border-radius: 4px;
}

.activity-name {
    font-weight: 600;
    color: #333;
    font-size: 1.1rem;
}

.activity-level {
    background: #4f46e5;
    color: white;
    padding: 4px 8px;
    border-radius: 12px;
    font-size: 0.85rem;
    font-weight: 500;
    white-space: nowrap;
}

.activity-time {
    background: #f59e0b;
    color: white;
    padding: 4px 8px;
    border-radius: 12px;
    font-size: 0.85rem;
    font-weight: 500;
    white-space: nowrap;
}

.activity-xp {
    background: #10b981;
    color: white;
    padding: 4px 8px;
    border-radius: 12px;
    font-size: 0.85rem;
    font-weight: 500;
    white-space: nowrap;
}

/* Calculator */
.calculator-container {
    max-width: 600px;
    margin: 0 auto;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    padding: 30px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
    backdrop-filter: blur(10px);
}

.activity-header {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 25px;
    justify-content: center;
}

.activity-header .activity-icon {
    width: 40px;
    height: 40px;
}

.activity-header h2 {
    color: #333;
    margin: 0;
    text-shadow: none;
    font-size: 1.5rem;
}

.calculator-info {
    margin-bottom: 25px;
}

.info-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

.info-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px;
    background: rgba(79, 70, 229, 0.1);
    border-radius: 8px;
    border-left: 4px solid #4f46e5;
}

.info-item .label {
    font-weight: 600;
    color: #4f46e5;
    font-size: 0.9rem;
}

.info-item .value,
.info-item span:not(.label) {
    font-weight: 500;
    color: #333;
}

.calculator-input {
    margin-bottom: 25px;
}

.calculator-input label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #333;
    font-size: 1.1rem;
}

.calculator-input input {
    width: 100%;
    padding: 15px;
    border: 2px solid #e5e7eb;
    border-radius: 10px;
    font-size: 1.1rem;
    transition: border-color 0.3s ease;
    background: white;
}

.calculator-input input:focus {
    outline: none;
    border-color: #4f46e5;
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.calculator-results {
    border-top: 2px solid #e5e7eb;
    padding-top: 25px;
}

.results-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

.result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px;
    background: rgba(16, 185, 129, 0.1);
    border-radius: 8px;
    border-left: 4px solid #10b981;
}

.result-item.completion-time {
    grid-column: 1 / -1;
    background: rgba(245, 158, 11, 0.1);
    border-left-color: #f59e0b;
}

.result-item .label {
    font-weight: 600;
    color: #10b981;
    font-size: 0.95rem;
}

.completion-time .label {
    color: #f59e0b;
}

.result-item .value {
    font-weight: 700;
    color: #333;
    font-size: 1.1rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }

    header h1 {
        font-size: 2rem;
    }

    .skills-grid {
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
        gap: 15px;
    }

    .skill-card {
        padding: 20px;
    }

    .activity-card {
        display: grid;
        grid-template-columns: 1fr auto;
        gap: 15px;
        padding: 18px;
        align-items: center;
    }

    .activity-header-mobile {
        display: flex;
        align-items: center;
        gap: 12px;
    }

    .activity-stats-mobile {
        display: flex;
        flex-direction: row;
        gap: 8px;
        align-items: center;
        flex-wrap: wrap;
        justify-content: flex-end;
    }

    .activity-level,
    .activity-time,
    .activity-xp {
        font-size: 0.8rem;
        padding: 3px 6px;
    }

    .activity-name {
        font-size: 1rem;
        flex-grow: 1;
    }

    .calculator-container {
        padding: 20px;
    }

    .info-grid,
    .results-grid {
        grid-template-columns: 1fr;
        gap: 10px;
    }

    .result-item.completion-time {
        grid-column: 1;
    }

    .activity-header {
        flex-direction: column;
        text-align: center;
        gap: 10px;
    }
}

@media (max-width: 480px) {
    .skills-grid {
        grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    }

    .skill-card {
        padding: 15px;
    }

    .skill-icon {
        width: 36px;
        height: 36px;
    }

    .skill-card h3 {
        font-size: 1rem;
    }
}