/* ============================================================
   AITECH — Shared Design System
   ============================================================ */

/* ---------- Base Reset & Typography ---------- */
*,
*::before,
*::after {
    box-sizing: border-box
}

body {
    margin: 0;
    font-family: 'Quicksand', sans-serif;
    background-color: #FAFAFA;
    color: #5A4A4A;
    transition: background-color .5s ease, color .5s ease;
    -webkit-tap-highlight-color: transparent;
    overflow-x: hidden;
    scrollbar-width: thin;
    scrollbar-color: #7c5cfc transparent;
    font-size: 16px;
    /* Accessibility baseline */
}

html.dark body {
    background-color: #0f172a;
    color: #F3F4F6
}

/* ---------- Accessibility: Minimum Font Sizes ---------- */
body,
p,
span,
div,
li,
td,
th,
label,
input,
select,
textarea,
button {
    font-size: inherit;
    line-height: 1.6;
}

/* Override any text-[9px] or text-[10px] classes with accessible minimums */
[class*="text-\[9px\]"],
[class*="text-\[10px\]"] {
    font-size: 12px !important;
    line-height: 1.5 !important;
}

/* ---------- Scrollbar ---------- */
::-webkit-scrollbar {
    width: 5px
}

::-webkit-scrollbar-track {
    background: transparent
}

::-webkit-scrollbar-thumb {
    background: #7c5cfc;
    border-radius: 10px
}

/* ---------- Glass Card ---------- */
.glass-card {
    background: rgba(255, 255, 255, .8);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border: 1px solid rgba(255, 255, 255, .5);
    box-shadow: 0 10px 30px -10px rgba(124, 92, 252, .08);
    transition: all .4s cubic-bezier(.4, 0, .2, 1);
}

html.dark .glass-card {
    background: rgba(30, 41, 59, .72);
    border: 1px solid rgba(255, 255, 255, .1);
    box-shadow: 0 10px 30px -10px rgba(0, 0, 0, .4);
}

/* ---------- Blob Decorations ---------- */
.blob {
    position: absolute;
    filter: blur(70px);
    z-index: -1;
    opacity: .5;
    pointer-events: none;
    will-change: transform;
}

html.dark .blob {
    opacity: .15
}

/* ---------- Animations ---------- */
@keyframes ns-float {

    0%,
    100% {
        transform: translateY(0) rotate(0)
    }

    50% {
        transform: translateY(-18px) rotate(1.5deg)
    }
}

@keyframes ns-fadeUp {
    from {
        opacity: 0;
        transform: translateY(18px)
    }

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

@keyframes ns-pulse {

    0%,
    100% {
        opacity: 1
    }

    50% {
        opacity: .55
    }
}

.animate-ns-float {
    animation: ns-float 6s ease-in-out infinite
}

.animate-ns-fadeUp {
    animation: ns-fadeUp .5s ease-out forwards
}

.animate-ns-pulse {
    animation: ns-pulse 3s ease-in-out infinite
}

/* ---------- Reveal on Scroll ---------- */
.reveal {
    opacity: 0;
    transform: translateY(18px);
    transition: all .55s ease-out
}

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

/* ---------- Nav compact on scroll ---------- */
.nav-compact {
    padding-top: .4rem !important;
    padding-bottom: .4rem !important;
    background: rgba(255, 255, 255, .92) !important;
    border-radius: 1.25rem !important;
    margin-top: .25rem !important;
}

html.dark .nav-compact {
    background: rgba(15, 23, 42, .92) !important
}

/* ---------- Tab buttons ---------- */
.tab-btn.active {
    background: linear-gradient(135deg, #7c5cfc, #a78bfa);
    color: #fff;
    box-shadow: 0 10px 20px -5px rgba(124, 92, 252, .45);
}

/* ---------- Resource/Solution card hover ---------- */
.resource-card,
.solution-item {
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    height: 100%;
    transition: all .3s ease;
}

.resource-card::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, transparent, rgba(255, 255, 255, .08), transparent);
    transform: translateX(-100%);
    transition: .55s;
}

@media(min-width:1024px) {
    .resource-card:hover::after {
        transform: translateX(100%)
    }

    .resource-card:hover {
        transform: translateY(-5px);
        border-color: #7c5cfc
    }
}

.solution-item:hover {
    transform: translateX(8px)
}

/* ---------- Primary accent utilities ---------- */
.text-accent {
    color: #7c5cfc
}

.bg-accent {
    background: #7c5cfc
}

.border-accent {
    border-color: #7c5cfc
}

.bg-accent-soft {
    background: rgba(124, 92, 252, .1)
}

html.dark .bg-accent-soft {
    background: rgba(124, 92, 252, .2)
}

/* ---------- Hero Gradient ---------- */
.hero-gradient {
    background: linear-gradient(135deg, #7c5cfc 0%, #a78bfa 50%, #c084fc 100%)
}

/* ---------- Custom focus ---------- */
:focus-visible {
    outline: 2px solid #7c5cfc;
    outline-offset: 2px;
    border-radius: 4px
}

/* ---------- Chat scrollbar ---------- */
#ai-response::-webkit-scrollbar {
    width: 4px
}

#ai-response::-webkit-scrollbar-thumb {
    background: #7c5cfc;
    border-radius: 10px
}

/* ---------- Study Music Player ---------- */
.ns-music-player {
    position: fixed;
    bottom: 6rem;
    left: 1rem;
    z-index: 55;
    width: 280px;
    max-width: calc(100vw - 2rem);
    transition: all .3s ease;
}

.ns-music-player.collapsed {
    width: 48px;
}

.ns-music-player .player-body {
    background: rgba(255, 255, 255, .92);
    backdrop-filter: blur(18px);
    border-radius: 1.25rem;
    border: 1px solid rgba(124, 92, 252, .15);
    box-shadow: 0 10px 30px -10px rgba(124, 92, 252, .2);
    overflow: hidden;
    transition: all .3s ease;
}

html.dark .ns-music-player .player-body {
    background: rgba(30, 41, 59, .9);
    border: 1px solid rgba(255, 255, 255, .1);
}

.ns-music-player .track-title {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.ns-music-player .player-btn {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    cursor: pointer;
    transition: all .2s ease;
    background: transparent;
    color: #7c5cfc;
    font-size: 18px;
}

.ns-music-player .player-btn:hover {
    background: rgba(124, 92, 252, .1);
    transform: scale(1.1);
}

.ns-music-player .player-btn.play-btn {
    background: linear-gradient(135deg, #7c5cfc, #a78bfa);
    color: #fff;
    width: 42px;
    height: 42px;
    box-shadow: 0 4px 12px rgba(124, 92, 252, .35);
}

.ns-music-player .player-btn.play-btn:hover {
    background: linear-gradient(135deg, #6b4ce0, #9b7bf8);
    transform: scale(1.1);
}

.ns-music-player .volume-slider {
    -webkit-appearance: none;
    appearance: none;
    width: 60px;
    height: 4px;
    border-radius: 2px;
    background: #e2e8f0;
    outline: none;
    cursor: pointer;
}

html.dark .ns-music-player .volume-slider {
    background: #334155
}

.ns-music-player .volume-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: #7c5cfc;
    cursor: pointer;
}

.ns-music-player .volume-slider::-moz-range-thumb {
    width: 14px;
    height: 14px;
    border: none;
    border-radius: 50%;
    background: #7c5cfc;
    cursor: pointer;
}

@keyframes ns-eq-bar {

    0%,
    100% {
        height: 4px
    }

    50% {
        height: 14px
    }
}

.eq-bar {
    width: 3px;
    border-radius: 2px;
    background: #7c5cfc;
    display: inline-block;
    animation: ns-eq-bar .6s ease-in-out infinite;
}

.eq-bar:nth-child(2) {
    animation-delay: .15s
}

.eq-bar:nth-child(3) {
    animation-delay: .3s
}

/* ---------- Chatbot file upload ---------- */
.chatbot-upload-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: .75rem;
    background: rgba(124, 92, 252, .1);
    color: #7c5cfc;
    border: none;
    cursor: pointer;
    transition: all .2s;
    font-size: 18px;
}

.chatbot-upload-btn:hover {
    background: rgba(124, 92, 252, .2);
    transform: scale(1.05)
}

.chatbot-file-preview {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px;
    border-radius: 12px;
    background: rgba(124, 92, 252, .08);
    border: 1px solid rgba(124, 92, 252, .15);
    font-size: 12px;
    font-weight: 600;
    margin-top: 6px;
}

.chatbot-file-preview .remove-file {
    cursor: pointer;
    color: #ef4444;
    font-size: 14px;
    margin-left: auto;
    transition: transform .2s;
}

.chatbot-file-preview .remove-file:hover {
    transform: scale(1.2)
}

/* ---------- Print Utilities ---------- */
@media print {

    .no-print,
    .ns-music-player {
        display: none !important
    }

    body {
        background: #fff !important;
        color: #000 !important
    }

    .glass-card {
        background: #fff !important;
        box-shadow: none !important;
        border: 1px solid #ddd !important
    }
}

/* ============================================================
   VISUAL EFFECTS — Trang trí & Hiệu ứng
   ============================================================ */

/* ---------- Animated Gradient Text ---------- */
.gradient-text {
    background: linear-gradient(135deg, #7c5cfc, #a78bfa, #ec4899, #f59e0b, #7c5cfc);
    background-size: 300% 300%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: ns-gradient-shift 4s ease infinite;
}

@keyframes ns-gradient-shift {
    0% {
        background-position: 0% 50%
    }

    50% {
        background-position: 100% 50%
    }

    100% {
        background-position: 0% 50%
    }
}

/* ---------- Shimmer / Shine on Cards ---------- */
.glass-card {
    position: relative;
    overflow: hidden;
}

.glass-card::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg,
            transparent 40%,
            rgba(124, 92, 252, 0.06) 45%,
            rgba(124, 92, 252, 0.12) 50%,
            rgba(124, 92, 252, 0.06) 55%,
            transparent 60%);
    transform: rotate(45deg) translateY(100%);
    transition: 0.8s;
    pointer-events: none;
    z-index: 0;
}

.glass-card:hover::before {
    transform: rotate(45deg) translateY(-100%);
}

.glass-card>* {
    position: relative;
    z-index: 1;
}

/* ---------- Glow Hover ---------- */
.glass-card:hover {
    box-shadow:
        0 10px 40px -10px rgba(124, 92, 252, 0.25),
        0 0 60px -20px rgba(124, 92, 252, 0.15);
}

html.dark .glass-card:hover {
    box-shadow:
        0 10px 40px -10px rgba(124, 92, 252, 0.35),
        0 0 80px -20px rgba(124, 92, 252, 0.2);
}

/* ---------- Float Animation ---------- */
.animate-float {
    animation: ns-float 6s ease-in-out infinite;
}

.animate-float-delay {
    animation: ns-float 6s ease-in-out infinite;
    animation-delay: 2s;
}

.animate-float-slow {
    animation: ns-float 8s ease-in-out infinite;
    animation-delay: 1s;
}

/* ---------- Sparkle / Glitter Particles ---------- */
.sparkle-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.sparkle {
    position: absolute;
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: #7c5cfc;
    animation: ns-sparkle-rise 6s linear infinite;
    opacity: 0;
}

.sparkle:nth-child(2n) {
    background: #a78bfa;
    width: 3px;
    height: 3px;
}

.sparkle:nth-child(3n) {
    background: #ec4899;
    width: 5px;
    height: 5px;
}

.sparkle:nth-child(4n) {
    background: #f59e0b;
    width: 2px;
    height: 2px;
}

@keyframes ns-sparkle-rise {
    0% {
        opacity: 0;
        transform: translateY(100vh) scale(0);
    }

    10% {
        opacity: 1;
    }

    90% {
        opacity: 0.6;
    }

    100% {
        opacity: 0;
        transform: translateY(-10vh) scale(1.5);
    }
}

/* ---------- Gradient Border Animation ---------- */
.gradient-border {
    position: relative;
    border: none !important;
}

.gradient-border::after {
    content: '';
    position: absolute;
    inset: -2px;
    border-radius: inherit;
    padding: 2px;
    background: linear-gradient(135deg, #7c5cfc, #a78bfa, #ec4899, #7c5cfc);
    background-size: 300% 300%;
    animation: ns-gradient-shift 3s ease infinite;
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    mask-composite: exclude;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.4s ease;
}

.gradient-border:hover::after {
    opacity: 1;
}

/* ---------- Pulse Ring (for buttons) ---------- */
.pulse-ring {
    position: relative;
}

.pulse-ring::after {
    content: '';
    position: absolute;
    inset: -4px;
    border-radius: inherit;
    border: 2px solid #7c5cfc;
    animation: ns-pulse-ring 2s ease-out infinite;
    pointer-events: none;
}

@keyframes ns-pulse-ring {
    0% {
        transform: scale(1);
        opacity: 0.6;
    }

    100% {
        transform: scale(1.15);
        opacity: 0;
    }
}

/* ---------- Tilt Hover on Cards ---------- */
@media (min-width: 768px) {
    .tilt-hover {
        transition: transform 0.3s ease;
        transform-style: preserve-3d;
        perspective: 1000px;
    }

    .tilt-hover:hover {
        transform: perspective(800px) rotateY(-3deg) rotateX(2deg) translateZ(10px);
    }
}

/* ---------- Aurora / Northern Lights BG ---------- */
.aurora-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -2;
    opacity: 0.04;
    background: linear-gradient(135deg,
            #7c5cfc 0%,
            #a78bfa 20%,
            #ec4899 40%,
            #7c5cfc 60%,
            #06b6d4 80%,
            #7c5cfc 100%);
    background-size: 400% 400%;
    animation: ns-aurora 15s ease infinite;
    pointer-events: none;
}

html.dark .aurora-bg {
    opacity: 0.06;
}

@keyframes ns-aurora {
    0% {
        background-position: 0% 50%;
    }

    25% {
        background-position: 50% 0%;
    }

    50% {
        background-position: 100% 50%;
    }

    75% {
        background-position: 50% 100%;
    }

    100% {
        background-position: 0% 50%;
    }
}

/* ---------- Stagger Animation for Lists ---------- */
.stagger-in>* {
    opacity: 0;
    transform: translateY(16px);
    animation: ns-fadeUp 0.4s ease forwards;
}

.stagger-in>*:nth-child(1) {
    animation-delay: 0.05s;
}

.stagger-in>*:nth-child(2) {
    animation-delay: 0.1s;
}

.stagger-in>*:nth-child(3) {
    animation-delay: 0.15s;
}

.stagger-in>*:nth-child(4) {
    animation-delay: 0.2s;
}

.stagger-in>*:nth-child(5) {
    animation-delay: 0.25s;
}

.stagger-in>*:nth-child(6) {
    animation-delay: 0.3s;
}

.stagger-in>*:nth-child(7) {
    animation-delay: 0.35s;
}

.stagger-in>*:nth-child(8) {
    animation-delay: 0.4s;
}

/* ---------- Neon Glow Text ---------- */
.neon-glow {
    text-shadow:
        0 0 7px rgba(124, 92, 252, 0.5),
        0 0 20px rgba(124, 92, 252, 0.3),
        0 0 40px rgba(124, 92, 252, 0.15);
}

html.dark .neon-glow {
    text-shadow:
        0 0 7px rgba(167, 139, 250, 0.7),
        0 0 20px rgba(167, 139, 250, 0.5),
        0 0 50px rgba(167, 139, 250, 0.3);
}

/* ---------- Smooth Page Enter ---------- */
body {
    animation: ns-page-enter 0.6s ease-out;
}

@keyframes ns-page-enter {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

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

/* ---------- Hover Scale Bounce ---------- */
.hover-bounce {
    transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.hover-bounce:hover {
    transform: scale(1.05);
}

/* ---------- Typewriter cursor ---------- */
.typewriter::after {
    content: '▌';
    color: #7c5cfc;
    animation: ns-blink 0.8s infinite;
}

@keyframes ns-blink {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0;
    }
}

/* ---------- Morphing blob ---------- */
@keyframes ns-morph {

    0%,
    100% {
        border-radius: 60% 40% 30% 70% / 60% 30% 70% 40%;
    }

    25% {
        border-radius: 30% 60% 70% 40% / 50% 60% 30% 60%;
    }

    50% {
        border-radius: 50% 60% 30% 60% / 30% 60% 70% 40%;
    }

    75% {
        border-radius: 60% 40% 60% 40% / 70% 30% 50% 60%;
    }
}

.blob-morph {
    animation: ns-morph 8s ease-in-out infinite;
}

/* ---------- Underline Grow (links) ---------- */
.underline-grow {
    position: relative;
    text-decoration: none;
}

.underline-grow::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    width: 0;
    height: 2px;
    background: #7c5cfc;
    border-radius: 2px;
    transition: all 0.3s ease;
}

.underline-grow:hover::after {
    left: 0;
    width: 100%;
}

/* ---------- Counter / Number Pop ---------- */
@keyframes ns-count-pop {
    0% {
        transform: scale(0.5);
        opacity: 0;
    }

    60% {
        transform: scale(1.2);
    }

    100% {
        transform: scale(1);
        opacity: 1;
    }
}

.count-pop {
    animation: ns-count-pop 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

/* ---------- Ripple Click Effect ---------- */
.ripple {
    position: relative;
    overflow: hidden;
}

.ripple::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    pointer-events: none;
    background-image: radial-gradient(circle, rgba(124, 92, 252, 0.3) 10%, transparent 10.01%);
    background-repeat: no-repeat;
    background-position: 50%;
    transform: scale(10);
    opacity: 0;
    transition: transform 0.5s, opacity 0.6s;
}

.ripple:active::after {
    transform: scale(0);
    opacity: 1;
    transition: 0s;
}