/* ============================================
   Animations
   Keyframes, scroll animations, hover effects
   ============================================ */


/* ===========================
   KEYFRAMES
   =========================== */

@keyframes blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0; }
}

@keyframes scrollLine {
    0% {
        transform: scaleY(0);
        transform-origin: top;
    }
    50% {
        transform: scaleY(1);
        transform-origin: top;
    }
    51% {
        transform: scaleY(1);
        transform-origin: bottom;
    }
    100% {
        transform: scaleY(0);
        transform-origin: bottom;
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes pulse {
    0%, 100% {
        box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.4);
    }
    50% {
        box-shadow: 0 0 0 6px rgba(16, 185, 129, 0);
    }
}

@keyframes gradientShift {
    0% {
        background-position: 0% center;
    }
    50% {
        background-position: 100% center;
    }
    100% {
        background-position: 0% center;
    }
}

@keyframes meshFloat {
    0%, 100% {
        transform: translate(0, 0);
    }
    33% {
        transform: translate(10px, -10px);
    }
    66% {
        transform: translate(-5px, 5px);
    }
}


/* ===========================
   SCROLL ANIMATIONS
   =========================== */

.animate-on-scroll {
    opacity: 0;
    transform: translateY(20px);
    transition:
        opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1),
        transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Generic stagger for direct children */
.animate-on-scroll:nth-child(2) {
    transition-delay: 0.1s;
}

.animate-on-scroll:nth-child(3) {
    transition-delay: 0.2s;
}

.animate-on-scroll:nth-child(4) {
    transition-delay: 0.3s;
}


/* ===========================
   ERA CARD STAGGER
   =========================== */

.eras .animate-on-scroll:nth-child(1) { transition-delay: 0s; }
.eras .animate-on-scroll:nth-child(2) { transition-delay: 0.12s; }
.eras .animate-on-scroll:nth-child(3) { transition-delay: 0.24s; }
.eras .animate-on-scroll:nth-child(4) { transition-delay: 0.36s; }


/* ===========================
   IMPACT CARD STAGGER
   =========================== */

.impact-card {
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.impact-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.impact-grid .impact-card:nth-child(1) { transition-delay: 0s; }
.impact-grid .impact-card:nth-child(2) { transition-delay: 0.1s; }
.impact-grid .impact-card:nth-child(3) { transition-delay: 0.2s; }
.impact-grid .impact-card:nth-child(4) { transition-delay: 0.3s; }


/* ===========================
   HERO ELEMENT STAGGER
   =========================== */

.hero .animate-on-scroll:nth-child(1) { transition-delay: 0.1s; }
.hero .animate-on-scroll:nth-child(2) { transition-delay: 0.25s; }
.hero .animate-on-scroll:nth-child(3) { transition-delay: 0.4s; }
.hero .animate-on-scroll:nth-child(4) { transition-delay: 0.55s; }
.hero .animate-on-scroll:nth-child(5) { transition-delay: 0.65s; }


/* ===========================
   EXPERTISE DOMAIN STAGGER
   =========================== */

.expertise-domains .animate-on-scroll:nth-child(1) { transition-delay: 0s; }
.expertise-domains .animate-on-scroll:nth-child(2) { transition-delay: 0.1s; }
.expertise-domains .animate-on-scroll:nth-child(3) { transition-delay: 0.2s; }
.expertise-domains .animate-on-scroll:nth-child(4) { transition-delay: 0.3s; }
.expertise-domains .animate-on-scroll:nth-child(5) { transition-delay: 0.4s; }
.expertise-domains .animate-on-scroll:nth-child(6) { transition-delay: 0.5s; }


/* ===========================
   JOURNEY ENTRY ANIMATIONS
   =========================== */

.journey-entry.visible .journey-entry__card {
    animation: fadeInUp 0.6s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.journey-entry:nth-child(odd).visible .journey-entry__card {
    animation: fadeInRight 0.6s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.journey-entry:nth-child(even).visible .journey-entry__card {
    animation: fadeInLeft 0.6s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}


/* ===========================
   HOVER DEPTH EFFECTS
   =========================== */

.glass-card {
    transition:
        transform var(--transition-base),
        box-shadow var(--transition-base),
        border-color var(--transition-base);
}

.era:hover {
    border-left-width: 6px;
}

.contact-link:hover {
    box-shadow: var(--shadow-md);
}

/* Nav link underline animation */
.navbar__link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--color-primary);
    transition:
        width var(--transition-fast),
        left var(--transition-fast);
}

.navbar__link:hover::after,
.navbar__link--active::after {
    width: 80%;
    left: 10%;
}

/* Mesh float for hero background */
.hero__mesh {
    animation: meshFloat 20s ease-in-out infinite;
}


/* ===========================
   REDUCED MOTION
   =========================== */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    .animate-on-scroll,
    .impact-card {
        opacity: 1;
        transform: none;
    }

    .hero__mesh {
        animation: none;
    }

    .hero__title-accent {
        animation: none;
    }
}