/* ================== Button ================== */
.btn {
    display: inline-block;
    padding: 0.8rem 1.6rem;
    border-radius: 14px;
    font-weight: 700;
    font-family: var(--font-heading);
    background: linear-gradient(135deg, var(--link-color), var(--accent));
    color: white;
    box-shadow: 0 10px 25px rgba(59, 130, 246, 0.2);
    transition: var(--transition-smooth);
    text-decoration: none;
    border: none;
    cursor: pointer;
}

.btn.ghost {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: var(--text-color);
}

.btn:hover {
    transform: translateY(-5px) scale(1.02);
    box-shadow: 0 20px 40px rgba(59, 130, 246, 0.4);
}

.btn:active {
    transform: translateY(-2px) scale(0.98);
}

/* ================== Skills Logos ================== */
.skills-logos {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    align-items: flex-start;
    gap: 2.5rem;
    margin-top: 4rem;
}

.skills-logos a {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    width: 120px;
    transition: var(--transition-smooth);
    text-decoration: none;
}

.skills-logos .icon-wrapper {
    width: 96px;
    height: 96px;
    border-radius: 24px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-bounce);
    box-shadow: var(--project-card-shadow);
}

.skills-logos img {
    width: 52px;
    height: 52px;
    object-fit: contain;
    transition: transform 0.4s var(--ease-out-expo);
}

.skills-logos img.icon-invert {
    filter: brightness(0) invert(1);
}

body.light .skills-logos img.icon-invert {
    filter: none;
}

.skills-logos span {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--muted);
    transition: var(--transition-fast);
    text-align: center;
}

.skills-logos a:hover .icon-wrapper {
    transform: translateY(-12px) scale(1.08) rotate(-3deg);
    border-color: var(--link-color);
    background: rgba(59, 130, 246, 0.12);
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.3);
}

.skills-logos a:hover span {
    color: var(--text-color);
    transform: scale(1.1);
}

.skills-logos a:hover img {
    transform: scale(1.15) rotate(3deg);
}

/* ================== Projects ================== */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.project-card {
    background: var(--project-card-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 28px;
    padding: 2.5rem;
    position: relative;
    overflow: hidden;
    transition: var(--transition-smooth);
    box-shadow: var(--project-card-shadow);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.project-card:hover {
    transform: translateY(-15px) scale(1.01);
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.4);
    border-color: var(--link-color);
}

.project-card h2 {
    font-family: var(--font-heading);
    font-weight: 700;
    text-align: left;
    margin-bottom: 0.5rem;
}

.project-card p {
    font-size: 0.95rem;
    color: var(--muted);
    margin: 0;
    text-align: left;
}

.project-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--project-card-accent);
    opacity: 0;
    transition: opacity 0.4s ease;
}

.project-card:hover::before {
    opacity: 1;
}

/* ================== Form ================== */
form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    padding: 2.5rem;
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    box-shadow: var(--project-card-shadow);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

label {
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--muted);
    margin-left: 0.2rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

input,
textarea {
    padding: 1rem 1.2rem;
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    font-size: 1rem;
    background: rgba(15, 23, 42, 0.3);
    color: var(--text-color);
    font-family: var(--font-body);
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

body.light input,
body.light textarea {
    background: rgba(255, 255, 255, 0.4);
}

input:focus,
textarea:focus {
    outline: none;
    border-color: var(--link-color);
    background: rgba(15, 23, 42, 0.5);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
    transform: translateY(-2px);
}

button[type="submit"] {
    margin-top: 0.5rem;
    align-self: flex-start;
}

/* ================== Back to Top ================== */
#backToTop {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 56px;
    height: 56px;
    background: rgba(59, 130, 246, 0.1);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    color: var(--link-color);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    opacity: 0;
    pointer-events: none;
    transform: translateY(20px) scale(0.9);
    transition: all 0.5s cubic-bezier(0.16, 1, 0.3, 1);
    z-index: 1400;
    cursor: pointer;
}

#backToTop::before {
    content: '';
    position: absolute;
    inset: -2px;
    background: linear-gradient(135deg, var(--link-color), var(--accent));
    border-radius: inherit;
    z-index: -1;
    opacity: 0.3;
    transition: opacity 0.3s ease;
}

#backToTop.show {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0) scale(1);
}

#backToTop svg {
    width: 24px;
    height: 24px;
    transition: transform 0.3s ease;
}

#backToTop:hover {
    background: var(--link-color);
    color: white;
    transform: translateY(-8px) scale(1.05);
    box-shadow: 0 15px 40px rgba(59, 130, 246, 0.3);
}

#backToTop:hover::before {
    opacity: 0.8;
}

#backToTop:hover svg {
    transform: translateY(-2px);
}

#backToTop:active {
    transform: translateY(-4px) scale(0.95);
}

/* Add a subtle pulse for attention when it appears */
@keyframes bttPulse {
    0% {
        box-shadow: 0 0 0 0 rgba(59, 130, 246, 0.4);
    }

    70% {
        box-shadow: 0 0 0 15px rgba(59, 130, 246, 0);
    }

    100% {
        box-shadow: 0 0 0 0 rgba(59, 130, 246, 0);
    }
}

#backToTop.show:not(:hover) {
    animation: bttPulse 2.5s infinite;
}

@media (max-width: 768px) {
    .skills-logos {
        gap: 1.5rem;
        margin-top: 2rem;
    }

    .skills-logos a {
        width: 100px;
    }

    .skills-logos .icon-wrapper {
        width: 80px;
        height: 80px;
        border-radius: 20px;
    }

    .skills-logos img {
        width: 44px;
        height: 44px;
    }

    .project-card {
        padding: 2rem;
    }

    form {
        padding: 1.8rem;
    }
}

@media (max-width: 480px) {
    .skills-logos a {
        width: 80px;
    }

    .skills-logos .icon-wrapper {
        width: 70px;
        height: 70px;
        border-radius: 18px;
    }

    .skills-logos img {
        width: 36px;
        height: 36px;
    }

    .skills-logos span {
        font-size: 0.85rem;
    }
}