/* ============================================
   PREMIUM UI — Wave Dividers, Tooltips, Counters
   ============================================ */

/* ---- Wave Section Dividers ---- */
.wave-divider {
    width: 100%;
    overflow: hidden;
    line-height: 0;
    display: block;
    position: relative;
}

.wave-divider svg {
    display: block;
    width: 100%;
    height: 60px;
}

.wave-divider.wave-top {
    margin-bottom: -2px;
}

.wave-divider.wave-bottom {
    margin-top: -2px;
}

/* ---- Custom Tooltip ---- */
[data-tooltip] {
    position: relative;
}

[data-tooltip]::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: calc(100% + 8px);
    left: 50%;
    transform: translateX(-50%) translateY(4px);
    background: rgba(15, 0, 0, 0.9);
    backdrop-filter: blur(8px);
    color: #f3f4f6;
    font-size: 12px;
    font-weight: 500;
    padding: 5px 10px;
    border-radius: 6px;
    white-space: nowrap;
    border: 1px solid rgba(255, 0, 60, 0.3);
    box-shadow: 0 4px 15px rgba(255, 0, 60, 0.2);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease, transform 0.2s ease;
    z-index: 9999;
}

[data-tooltip]::before {
    content: '';
    position: absolute;
    bottom: calc(100% + 3px);
    left: 50%;
    transform: translateX(-50%);
    border: 5px solid transparent;
    border-top-color: rgba(255, 0, 60, 0.4);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
    z-index: 9999;
}

[data-tooltip]:hover::after,
[data-tooltip]:hover::before {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* ---- Number Counter ---- */
.counter-number {
    display: inline-block;
    font-variant-numeric: tabular-nums;
    transition: opacity 0.3s ease;
}

/* ---- Active Nav Underline ---- */
.nav-link.active {
    color: var(--primary-color) !important;
}

.nav-link.active::after {
    width: 100% !important;
}

/* ---- Enhanced Section Headers ---- */
.section-header {
    text-align: center;
    margin-bottom: 3rem;
    position: relative;
}

.section-header::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    margin: 12px auto 0;
    border-radius: 2px;
    animation: pulse-glow 2s ease infinite;
}

/* ---- Scroll Reveal Base ---- */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1),
                transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

.reveal-left {
    opacity: 0;
    transform: translateX(-40px);
    transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1),
                transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}

.reveal-left.visible {
    opacity: 1;
    transform: translateX(0);
}

.reveal-right {
    opacity: 0;
    transform: translateX(40px);
    transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1),
                transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}

.reveal-right.visible {
    opacity: 1;
    transform: translateX(0);
}

/* Stagger delay utilities */
.reveal-delay-1  { transition-delay: 0.1s; }
.reveal-delay-2  { transition-delay: 0.2s; }
.reveal-delay-3  { transition-delay: 0.3s; }
.reveal-delay-4  { transition-delay: 0.4s; }
.reveal-delay-5  { transition-delay: 0.5s; }

/* ---- Magnetic Button Base ---- */
.btn {
    will-change: transform;
    transition: transform 0.2s cubic-bezier(0.23, 1, 0.32, 1),
                box-shadow 0.3s ease,
                background 0.3s ease,
                color 0.3s ease !important;
}

/* ---- 3D Tilt Card ---- */
.tilt-card {
    transform-style: preserve-3d;
    transform: perspective(1000px);
    transition: transform 0.15s ease-out;
}

/* ---- Premium Glassmorphism upgrade ---- */
.skill-category,
.project-card,
.contact-form,
.contact-item {
    background: linear-gradient(
        135deg,
        rgba(255, 255, 255, 0.06) 0%,
        rgba(255, 0, 60, 0.04) 100%
    ) !important;
    border: 1px solid rgba(255, 0, 60, 0.18) !important;
    backdrop-filter: blur(20px) saturate(160%) !important;
    -webkit-backdrop-filter: blur(20px) saturate(160%) !important;
    box-shadow:
        0 4px 24px rgba(0, 0, 0, 0.4),
        inset 0 1px 0 rgba(255, 255, 255, 0.07) !important;
    border-radius: 16px !important;
    transition: all 0.3s cubic-bezier(0.23, 1, 0.32, 1) !important;
}

.skill-category:hover,
.project-card:hover,
.contact-item:hover {
    background: linear-gradient(
        135deg,
        rgba(255, 255, 255, 0.09) 0%,
        rgba(255, 0, 60, 0.07) 100%
    ) !important;
    border-color: rgba(255, 0, 60, 0.45) !important;
    box-shadow:
        0 8px 40px rgba(255, 0, 60, 0.2),
        0 0 0 1px rgba(255, 0, 60, 0.15),
        inset 0 1px 0 rgba(255, 255, 255, 0.12) !important;
    transform: translateY(-6px) !important;
}

/* Shimmer sweep on card hover */
.skill-category,
.project-card {
    position: relative;
    overflow: hidden;
}

.skill-category::after,
.project-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 60%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.06),
        transparent
    );
    transition: left 0.6s ease;
    pointer-events: none;
}

.skill-category:hover::after,
.project-card:hover::after {
    left: 150%;
}

/* Mobile: skip heavy effects */
@media (max-width: 768px) {
    [data-tooltip]::after,
    [data-tooltip]::before {
        display: none;
    }
    
    .wave-divider svg {
        height: 40px;
    }
}