:root {
    --bg-dark: #0f172a;
    --card-bg: rgba(30, 41, 59, 0.7);
    --border-color: rgba(255, 255, 255, 0.1);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-cyan: #22d3ee;
    --accent-blue: #3b82f6;
    --accent-indigo: #6366f1;
    --accent-purple: #a855f7;
    --success: #10b981;
    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Inter', sans-serif;
}

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

body {
    background-color: var(--bg-dark);
    font-family: var(--font-body);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
}

.background-blobs {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
    background: url('bg.png') center/cover no-repeat;
    opacity: 0.1;
    filter: blur(40px) brightness(0.7);
}

.blob {
    position: absolute;
    width: 500px;
    height: 500px;
    border-radius: 50%;
    filter: blur(100px);
    animation: blob-float 15s infinite alternate ease-in-out;
}

.blob-1 {
    background: var(--accent-blue);
    top: -50px;
    left: -50px;
    animation-delay: 0s;
}

.blob-2 {
    background: var(--accent-purple);
    bottom: -50px;
    right: -50px;
    animation-delay: 3s;
}

.blob-3 {
    background: var(--accent-cyan);
    top: 50%;
    left: 50%;
    width: 300px;
    height: 300px;
    animation-delay: 6s;
}

@keyframes blob-float {
    0% {
        transform: translate(0, 0) scale(1);
    }

    100% {
        transform: translate(50px, 100px) scale(1.1);
    }
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Header & Progress */
header {
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    padding: 1.5rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo h1 {
    font-family: var(--font-heading);
    font-size: 1.75rem;
    font-weight: 800;
}

.logo span {
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-indigo));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.progress-section {
    flex: 1;
    max-width: 500px;
}

.progress-info {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-bottom: 0.5rem;
}

#progress-percent {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-cyan);
}

.progress-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.progress-bar-container {
    height: 8px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 99px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--accent-blue), var(--accent-cyan));
    box-shadow: 0 0 15px rgba(34, 211, 238, 0.4);
    transition: width 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Tabs Navigation */
.tabs {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin: 3rem 0;
}

.tab-btn {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.75rem 1.5rem;
    border-radius: 12px;
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.tab-btn:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    transform: translateY(-2px);
}

.tab-btn.active {
    background: linear-gradient(135deg, var(--accent-indigo), var(--accent-purple));
    color: white;
    border-color: transparent;
    box-shadow: 0 8px 20px rgba(99, 102, 241, 0.3);
}

/* Tab Content Visibility */
.tab-content {
    display: none;
    animation: fadeIn 0.5s ease-out;
}

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

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-header h2 {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, #fff, #94a3b8);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.section-header p {
    color: var(--text-secondary);
    font-size: 1.125rem;
}

/* Skills Grid */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
    margin-bottom: 4rem;
}

.skill-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 1.5rem;
    backdrop-filter: blur(10px);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.skill-card:hover {
    border-color: var(--accent-cyan);
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.skill-card h3 {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1.25rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border-color);
    color: var(--accent-cyan);
}

.check-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
    cursor: pointer;
    user-select: none;
    transition: transform 0.2s;
}

.check-item:hover {
    transform: translateX(4px);
}

@keyframes shake {

    0%,
    100% {
        transform: translateX(0);
    }

    25% {
        transform: translateX(-10px);
    }

    50% {
        transform: translateX(10px);
    }

    75% {
        transform: translateX(-10px);
    }
}

.checkbox {
    width: 20px;
    height: 20px;
    border: 2px solid var(--text-secondary);
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: all 0.2s;
}

.checkbox.checked {
    background-color: var(--success);
    border-color: var(--success);
    box-shadow: 0 0 10px rgba(16, 185, 129, 0.4);
}

.checkbox.checked::after {
    content: "✓";
    color: white;
    font-size: 14px;
    font-weight: bold;
}

.check-text {
    font-size: 0.95rem;
    color: var(--text-secondary);
    transition: color 0.2s;
}

.checkbox.checked+.check-text {
    color: var(--text-primary);
    text-decoration: line-through;
    opacity: 0.7;
}

/* Courses Styling */
.course-category {
    margin-bottom: 4rem;
}

.category-title {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    color: var(--accent-purple);
    margin-bottom: 1.5rem;
    padding-left: 1rem;
    border-left: 4px solid var(--accent-purple);
}

.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 1.5rem;
}

.course-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    transition: all 0.3s ease;
}

.course-card:hover {
    background: rgba(30, 41, 59, 1);
    border-color: var(--accent-purple);
}

.course-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
}

.course-title {
    font-weight: 600;
    font-size: 1.1rem;
}

.course-btn {
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-indigo));
    color: white;
    text-decoration: none;
    padding: 0.6rem 1.2rem;
    border-radius: 10px;
    font-size: 0.875rem;
    font-weight: 600;
    text-align: center;
    transition: transform 0.2s, box-shadow 0.2s;
    margin-top: auto;
}

.course-btn:hover {
    transform: scale(1.03);
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
}

/* Footer Rendering */
footer {
    padding: 4rem 0;
    text-align: center;
    color: var(--text-secondary);
    border-top: 1px solid var(--border-color);
}

/* Responsive fixes */
@media (max-width: 768px) {
    .header-container {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .section-header h2 {
        font-size: 1.75rem;
    }

    .tabs {
        flex-wrap: wrap;
    }
}

/* Login UI */
.login-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(20px);
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.5s ease;
}

.login-overlay.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.login-card {
    background: var(--card-bg);
    border: 2px solid var(--accent-blue);
    padding: 3rem;
    border-radius: 20px;
    width: 400px;
    text-align: center;
    box-shadow: 0 0 40px rgba(59, 130, 246, 0.2);
}

.login-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: block;
}

.login-header h2 {
    font-family: var(--font-heading);
    margin-bottom: 10px;
}

.login-header p {
    color: var(--text-secondary);
    margin-bottom: 25px;
    font-size: 0.9rem;
}

#password-input {
    width: 100%;
    padding: 12px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background: #1e293b;
    color: white;
    margin-bottom: 20px;
    font-size: 1rem;
    text-align: center;
}

#login-btn {
    width: 100%;
    padding: 12px;
    border-radius: 8px;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-indigo));
    border: none;
    color: white;
    cursor: pointer;
    font-weight: 700;
    transition: transform 0.2s;
}

#login-btn:hover {
    transform: translateY(-2px);
}

.error-msg {
    color: #f87171;
    font-size: 0.85rem;
    margin-top: 15px;
    min-height: 1em;
}

.login-footer {
    margin-top: 20px;
    opacity: 0.5;
    font-size: 0.8rem;
}

/* Main Content Blur */
#main-content {
    transition: filter 0.8s ease;
}

#main-content.blurred {
    filter: blur(40px) brightness(0.5);
    pointer-events: none;
}