:root {
    --primary: #2563EB;
    --secondary: #1D4ED8;
    --accent: #0F766E;
    --dark: #0F172A;
    --dark-gradient: black;
    --text: #334155;
    --muted: #64748B;
    --muted-light: #94A3B8;
    --white: #ffffff;
    --section-bg: #2563EB;
    --bg: #F7F9FC;
    --bg-hover: #F1F5F9;
    --bg-rgb: #ffffff;
    --border: #E2E8F0;
    --border-hover: #CBD5E1;
    --btn-outline-border: #969798;
    --shadow: 0 1px 2px rgba(15, 23, 42, .05);
    --shadow-hover: 0 8px 22px rgba(15, 23, 42, .08);
    --shadow-sm-hover: 0 6px 14px rgba(15, 23, 42, .06);
    --shadow-primary-hover: 0 8px 18px rgba(37, 99, 235, .14);
    --shadow-lg: 0 16px 32px rgba(15, 23, 42, .12);
    --shadow-xl: 0 24px 60px rgba(15, 23, 42, .08);
    --shadow-xxl: 0 30px 80px rgba(0, 0, 0, .15);
    --button-radius: 8px;
    --card-radius: 16px;
    --transition: .35s ease;
    --gradient: #2563EB;
    --header-bg: rgba(255, 255, 255, 0.97);
    --panel: #ffffff;
    --panel-soft: #F8FAFC;
    --panel-ghost: rgba(203, 213, 225, .05);
    --curve-surface: #DCE6F3;
    --hero-grad-1: rgba(203, 225, 252, .55);
    --hero-grad-2: rgba(222, 236, 255, .45);
    --hero-grad-3: rgba(214, 228, 250, .40);
    --hero-grad-4: rgba(183, 208, 255, .55);
    --hero-grad-base-1: #FFFFFF;
    --hero-grad-base-2: #F4F8FC;

    /* Theme & Accent Variables */
    --star-color: #fbbf24;
    --cyan-start: #0ea5e9;
    --cyan-end: #06b6d4;
    --cyan-gradient: linear-gradient(90deg, var(--cyan-start), var(--cyan-end));
    --cyan-gradient-v: linear-gradient(180deg, var(--cyan-start), var(--cyan-end));
    --primary-border-hover: rgba(37, 99, 235, .60);
    --primary-shadow-sm: 0 12px 28px rgba(37, 99, 235, .12);
    --primary-light-border: #BFDBFE;
    --tag-bg: #EEF2FF;
    --chip-bg: #E0E7FF;
    --heading-accent: #1f356b;
    --text-secondary: rgba(12, 20, 40, 0.8);
    --rail-text: #818181;
    --glass-border: rgba(226, 232, 240, 0.9);
    --glass-bg: rgba(255, 255, 255, 0.86);
    --white-glow-subtle: rgba(255, 255, 255, .08);
    --text-on-primary-muted: rgba(255, 255, 255, .85);
    --service-card-hover-bg: linear-gradient(135deg, rgba(37, 99, 235, .05), rgba(124, 58, 237, .05));
    --primary-glow-shadow: 0 18px 40px rgba(37, 99, 235, .25);
    --shadow-tab-active: 0 10px 22px rgba(37, 99, 235, .24);
    --focus-ring: rgba(37, 99, 235, .35);
    --scrollbar-track: #EEF2F7;
    --scrollbar-thumb: #CBD5E1;
    --scrollbar-thumb-hover: #94A3B8;
}

/* ========================= */
/* DARK MODE VARIABLES       */
/* ========================= */

[data-theme="dark"] {
    --bg: #0B1220;
    --bg-hover: #1E293B;
    --section-bg: #01050e;
    --bg-rgb: 11, 18, 32;
    --dark: #E2E8F0;
    --dark-gradient: rgb(156, 146, 146);
    --text: #CBD5E1;
    --muted: #94A3B8;
    --muted-light: #64748B;
    --border: #243247;
    --border-hover: #334155;
    --header-bg: rgba(11, 18, 32, 0.92);
    --panel: #111B2E;
    --panel-soft: #060b14;
    --panel-ghost: rgba(255, 255, 255, .03);
    --curve-surface: #162238;
    --shadow: 0 1px 2px rgba(2, 6, 23, .38);
    --shadow-hover: 0 10px 24px rgba(2, 6, 23, .42);
    --shadow-sm-hover: 0 6px 14px rgba(2, 6, 23, .25);
    --shadow-primary-hover: 0 8px 18px rgba(37, 99, 235, .30);
    --shadow-lg: 0 16px 32px rgba(2, 6, 23, .50);
    --shadow-xl: 0 24px 60px rgba(2, 6, 23, .60);
    --shadow-xxl: 0 30px 80px rgba(0, 0, 0, .40);
    --hero-grad-1: rgba(59, 130, 246, .22);
    --hero-grad-2: rgba(56, 189, 248, .18);
    --hero-grad-3: rgba(30, 64, 175, .26);
    --hero-grad-4: rgba(15, 23, 42, .40);
    --hero-grad-base-1: #0D172A;
    --hero-grad-base-2: #0B1220;

    --star-color: #fbbf24;
    --primary-border-hover: rgba(59, 130, 246, .60);
    --primary-shadow-sm: 0 12px 28px rgba(59, 130, 246, .20);
    --primary-light-border: #1D4ED8;
    --tag-bg: rgba(37, 99, 235, .18);
    --chip-bg: rgba(37, 99, 235, .22);
    --heading-accent: #E2E8F0;
    --text-secondary: #CBD5E1;
    --rail-text: #94A3B8;
    --glass-border: rgba(148, 163, 184, 0.28);
    --glass-bg: rgba(15, 23, 42, 0.86);
    --service-card-hover-bg: linear-gradient(135deg, rgba(37, 99, 235, .15), rgba(124, 58, 237, .15));
    --primary-glow-shadow: 0 18px 40px rgba(37, 99, 235, .35);
    --shadow-tab-active: 0 10px 22px rgba(14, 165, 233, .28);
    --focus-ring: rgba(59, 130, 246, .50);
    --scrollbar-track: #0B1220;
    --scrollbar-thumb: #243247;
    --scrollbar-thumb-hover: #334155;
}

/* ========================= */
/* GLOBAL STYLES & RESETS    */
/* ========================= */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Poppins', sans-serif;
    background: var(--bg);
    color: var(--dark);
    overflow-x: hidden;
}

img {
    max-width: 100%;
    display: block;
}

ul {
    list-style: none;
}

a {
    text-decoration: none;
    color: inherit;
}

.container {
    width: min(1180px, 92%);
    margin: auto;
}

section {
    padding: clamp(3.5rem, 5.5vw, 6rem) 0;
}

h1 {
    font-size: clamp(1.25rem, 3vw, 3.25rem);
    line-height: 1.2;
    font-weight: 600;
    letter-spacing: -0.02em;
    margin-bottom: clamp(1rem, 1.5vw, 1.25rem);
}

h2 {
    font-size: clamp(1.75rem, 3vw, 2.5rem);
    line-height: 1.25;
    font-weight: 700;
    letter-spacing: -0.015em;
    margin-bottom: clamp(0.875rem, 1.2vw, 1rem);
}

h3 {
    font-size: clamp(1.25rem, 2vw, 1.625rem);
    line-height: 1.35;
    font-weight: 600;
    letter-spacing: -0.01em;
    margin-bottom: clamp(0.625rem, 1vw, 0.75rem);
}

p {
    color: var(--muted);
    font-size: 1.0625rem;
    line-height: 1.7;
}

/* ========================= */
/* GLOBAL HEADINGS & BUTTONS */
/* ========================= */

.section-heading {
    margin-bottom: clamp(2rem, 4vw, 3.75rem);
}

.section-heading span {
    display: inline-block;
    margin-bottom: clamp(0.75rem, 1.2vw, 1.125rem);
    font-size: 14px;
    font-weight: 600;
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 2px;
}

.section-heading.center {
    text-align: center;
}

.section-tag {
    letter-spacing: .08em;
    color: var(--primary);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: clamp(0.75rem, 1vw + 0.4rem, 0.875rem) clamp(1.25rem, 2vw, 1.75rem);
    border-radius: var(--button-radius);
    font-weight: 600;
    transition: transform .18s ease, background-color .18s ease, border-color .18s ease, color .18s ease, box-shadow .18s ease;
    will-change: transform;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: var(--primary);
    color: var(--white);
    border: 1px solid var(--primary);
}

.btn-primary:hover {
    transform: translateY(-2px);
    background: var(--secondary);
    border-color: var(--secondary);
    box-shadow: var(--shadow-primary-hover);
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--btn-outline-border);
    color: var(--dark);
}

.btn-outline:hover {
    transform: translateY(-2px);
    background: var(--bg-hover);
    color: var(--dark);
    border-color: var(--border-hover);
    box-shadow: var(--shadow-sm-hover);
}

.btn:active {
    transform: translateY(0);
    box-shadow: none;
}

[data-theme="dark"] .btn-outline {
    color: var(--dark);
    border-color: var(--border-hover);
}

[data-theme="dark"] .btn-outline:hover {
    background: var(--bg-hover);
    color: var(--white);
    border-color: var(--primary);
}

/* ========================= */
/* ANIMATIONS & REVEAL       */
/* ========================= */

.reveal {
    opacity: 0;
    transform: translateY(70px);
    transition: opacity .8s ease, transform .8s ease;
}

.reveal.active {
    opacity: 1;
    transform: none;
}

/* ========================= */
/* UTILITIES & CUSTOM CONTROLS*/
/* ========================= */

.text-center {
    text-align: center;
}

.mt-2 {
    margin-top: clamp(1rem, 1.5vw, 1.25rem);
}

.mt-3 {
    margin-top: clamp(1.5rem, 2.2vw, 1.875rem);
}

.mt-4 {
    margin-top: clamp(2rem, 3vw, 2.5rem);
}

.mb-2 {
    margin-bottom: clamp(1rem, 1.5vw, 1.25rem);
}

.mb-3 {
    margin-bottom: clamp(1.5rem, 2.2vw, 1.875rem);
}

.mb-4 {
    margin-bottom: clamp(2rem, 3vw, 2.5rem);
}

.hidden {
    display: none;
}

::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--scrollbar-track);
}

::-webkit-scrollbar-thumb {
    background: var(--scrollbar-thumb);
    border-radius: 999px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--scrollbar-thumb-hover);
}

::selection {
    background: var(--primary);
    color: var(--white);
}

button,
a {
    outline: none;
}

button:focus-visible,
a:focus-visible {
    outline: 3px solid var(--focus-ring);
    outline-offset: 4px;
}

@media (max-width: 768px) {
    section {
        padding: clamp(3rem, 5vw, 4rem) 0;
    }

    h1 {
        font-size: 32px;
        line-height: 1.22;
        margin-bottom: 16px;
    }

    h2 {
        font-size: 26px;
        line-height: 1.28;
        margin-bottom: 14px;
    }

    h3 {
        font-size: 22px;
        line-height: 1.32;
        margin-bottom: 10px;
    }

    p {
        font-size: 15px;
        line-height: 1.65;
    }
}

@media (max-width: 500px) {
    .container {
        width: 92%;
    }

    section {
        padding: clamp(2.5rem, 6vw, 3.5rem) 0;
    }

    h1 {
        font-size: 28px;
        line-height: 1.25;
        margin-bottom: 14px;
    }

    h2 {
        font-size: 23px;
        line-height: 1.3;
        margin-bottom: 12px;
    }

    h3 {
        font-size: 19px;
        line-height: 1.35;
    }

    .btn {
        width: 100%;
    }
}