/* Page Navigation */
.page-nav {
    border-bottom: 1px solid var(--border);
}

.nav-back {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text);
    text-decoration: none;
    font-size: 15px;
}

.nav-back i {
    color: var(--primary);
    font-size: 14px;
}

/* Project Header */
.project-header {
    padding: 60px 0 40px;
    text-align: center;
}

.project-icon {
    width: 70px;
    height: 70px;
    margin: 0 auto 20px;
    background: linear-gradient(135deg, #00B2FF, #006AFF);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 30px;
    color: white;
}

.project-header h1 {
    font-size: 36px;
    font-weight: 600;
    margin-bottom: 8px;
    letter-spacing: -0.5px;
}

.project-type {
    color: var(--text-light);
    font-size: 16px;
}

/* Info Cards */
.project-sections {
    padding: 20px 0 60px;
}

.project-sections .container {
    max-width: 600px;
}

.info-card {
    background: white;
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 28px;
    margin-bottom: 20px;
}

.card-title {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
}

.card-title i {
    font-size: 24px;
}

.card-title h2 {
    font-size: 20px;
    font-weight: 600;
}

.card-desc {
    color: var(--text-light);
    margin-bottom: 16px;
    font-size: 15px;
}

.card-meta {
    display: flex;
    gap: 20px;
    margin-bottom: 20px;
}

.card-meta span {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--text-light);
    font-size: 14px;
}

.card-meta i {
    color: var(--primary);
}

/* Tutorial Thumbnail */
.tutorial-thumb {
    display: block;
    position: relative;
    margin-bottom: 20px;
    border-radius: 10px;
    overflow: hidden;
}

.tutorial-thumb img {
    width: 100%;
    display: block;
}

.play-btn {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 44px;
    height: 44px;
    background: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.play-btn i {
    color: #ff0000;
    font-size: 18px;
    margin-left: 2px;
}

.time {
    position: absolute;
    bottom: 8px;
    right: 8px;
    background: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 12px;
}

/* Card Buttons */
.card-btn {
    display: inline-block;
    padding: 10px 20px;
    border-radius: 30px;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s;
    width: 100%;
    text-align: center;
}

.card-btn.github {
    background: #24292e;
    color: white;
}

.card-btn.github:hover {
    background: #1b1f23;
}

.card-btn.youtube {
    background: #ff0000;
    color: white;
}

.card-btn.youtube:hover {
    background: #cc0000;
}

.card-btn.messenger {
    background: linear-gradient(135deg, #00B2FF, #006AFF);
    color: white;
}

.card-btn.messenger:hover {
    opacity: 0.9;
}

/* Colors */
.info-card:nth-child(1) .card-title i { color: #24292e; }
.info-card:nth-child(2) .card-title i { color: #ff0000; }
.info-card:nth-child(3) .card-title i { color: #00B2FF; }