/* 
   ==========================================================================
   ONLINE TESTS BY CIMPLE - CONSOLIDATED STYLESHEET
   ========================================================================== 
*/

/* --- 1. Variables & Global Styles --- */
* {
    box-sizing: border-box;
}

:root {
    --cyan: #06b6d4;
    --cyan-glow: #22d3ee;
    --purple: #8b5cf6;
    --purple-glow: #a78bfa;
    --pink: #ec4899;
    --pink-glow: #f472b6;
    --font-family-sans: 'Inter', system-ui, -apple-system, sans-serif;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --transition-fast: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

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

::-webkit-scrollbar-thumb {
    background: linear-gradient(to bottom, var(--cyan), var(--purple));
    border-radius: 10px;
    border: 2px solid var(--bg-color);
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(to bottom, var(--cyan-glow), var(--purple-glow));
}

[data-theme="bright"] {
    --bg-color: #f8fafc;
    --text-color: #0f172a;
    --text-color-light: #64748b;
    --header-bg: rgba(255, 255, 255, 0.7);
    --card-bg: rgba(255, 255, 255, 0.8);
    --border-color: rgba(226, 232, 240, 0.8);
    --toggle-btn-bg: #f1f5f9;
}

[data-theme="dark"] {
    --bg-color: #020617;
    --text-color: #f1f5f9;
    --text-color-light: #94a3b8;
    --header-bg: rgba(15, 23, 42, 0.7);
    --card-bg: rgba(30, 41, 59, 0.5);
    --border-color: rgba(51, 65, 85, 0.5);
    --toggle-btn-bg: #1e293b;
}

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-family-sans);
    margin: 0;
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

.particles-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.content-wrapper {
    position: relative;
    z-index: 1;
    padding-top: 100px;
}

/* --- 2. Header & Navigation --- */
.header {
    position: fixed;
    top: 1.25rem;
    left: 50%;
    transform: translateX(-50%);
    width: 85%;
    max-width: 900px;
    padding: 0.6rem 1.25rem;
    z-index: 1001;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: var(--header-bg);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    box-shadow: var(--shadow-lg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: var(--transition-fast);
}

.header.scrolled {
    top: 0.75rem;
    width: 92%;
    max-width: 1000px;
    border-radius: 1rem;
    box-shadow: var(--shadow-xl);
    padding: 0.5rem 1.25rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
}

.blinking-dot {
    width: 8px;
    height: 8px;
    background-color: var(--cyan-glow);
    border-radius: 50%;
    box-shadow: 0 0 10px var(--cyan-glow);
    animation: blink 2s infinite ease-in-out;
}

.logo-text {
    font-size: 1.15rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--cyan), var(--purple));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    margin: 0;
    letter-spacing: -0.025em;
    white-space: nowrap;
}

.main-nav {
    display: flex;
    gap: 1.5rem;
}

.nav-link {
    text-decoration: none;
    color: var(--text-color-light);
    font-weight: 600;
    font-size: 0.85rem;
    transition: var(--transition-fast);
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-color);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(to right, var(--cyan), var(--purple));
    transition: var(--transition-fast);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

/* --- 3. Hamburger & Mobile Nav --- */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    z-index: 1003;
}

.hamburger span {
    width: 24px;
    height: 2px;
    background-color: var(--text-color);
    transition: all 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    border-radius: 2px;
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(7px, 7px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
    transform: translateX(20px);
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

.mobile-nav-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(2, 6, 23, 0.98);
    backdrop-filter: blur(10px);
    z-index: 1002;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.mobile-nav-overlay.active {
    opacity: 1;
    pointer-events: all;
    display: block;
}

.mobile-close-btn {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    background: var(--toggle-btn-bg);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    cursor: pointer;
    transition: var(--transition-fast);
}

.mobile-close-btn:hover {
    transform: rotate(90deg);
    background: var(--border-color);
}

.mobile-nav-menu {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    height: 100%;
    gap: 2.5rem;
}

.mobile-nav-menu .nav-link {
    font-size: 1.75rem;
    font-weight: 700;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.3s ease;
}

.mobile-nav-overlay.active .mobile-nav-menu .nav-link {
    opacity: 1;
    transform: translateY(0);
}

/* --- 4. Hero Section --- */
.hero {
    text-align: center;
    padding: 6rem 0 8rem;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.hero-title {
    font-size: clamp(2.5rem, 8vw, 5rem);
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    letter-spacing: -0.05em;
}

.neon-effect {
    display: inline-block;
    margin: 0 0.2rem;
}

.hero-subtext {
    font-size: clamp(1.1rem, 3vw, 1.5rem);
    color: var(--text-color-light);
    max-width: 800px;
    margin-bottom: 3rem;
    font-weight: 500;
}

/* --- 5. Buttons & Interactive --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.6rem 1.5rem;
    font-weight: 700;
    border-radius: 0.75rem;
    text-decoration: none;
    transition: var(--transition-fast);
    cursor: pointer;
    border: none;
    font-size: 0.95rem;
}

.btn-primary {
    background-color: var(--text-color);
    color: var(--bg-color);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-gradient {
    background: linear-gradient(135deg, var(--cyan), var(--purple));
    color: white;
    box-shadow: 0 10px 20px -10px rgba(6, 182, 212, 0.5);
}

.btn-gradient:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 30px -10px rgba(6, 182, 212, 0.6);
}

.theme-toggle-btn {
    background-color: var(--toggle-btn-bg);
    color: var(--text-color);
    width: 36px;
    height: 36px;
    border-radius: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    border: 1px solid var(--border-color);
    transition: var(--transition-fast);
}

.scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(to right, var(--cyan), var(--purple), var(--pink));
    z-index: 2000;
    transform-origin: 0 50%;
    transform: scaleX(0);
    transition: transform 0.1s ease-out;
}

/* --- 6. Sections & Cards --- */
.section {
    padding: 5rem 0;
}

.section-title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 800;
    text-align: center;
    margin-bottom: 4rem;
    letter-spacing: -0.025em;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 2.5rem;
    border-radius: 1.5rem;
    box-shadow: var(--shadow-md);
    backdrop-filter: blur(8px);
    transition: var(--transition-fast);
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
    border-color: var(--cyan);
}

.feature-icon-wrapper {
    width: 4rem;
    height: 4rem;
    border-radius: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
    animation: float 3s ease-in-out infinite;
}

.test-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.test-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 2rem;
    border-radius: 1.5rem;
    display: flex;
    flex-direction: column;
    transition: var(--transition-fast);
    box-shadow: var(--shadow-md);
}

.test-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.test-card-button {
    margin-top: auto;
    width: 100%;
    text-align: center;
    padding: 0.8rem;
    border-radius: 1rem;
    font-weight: 700;
    text-decoration: none;
    transition: var(--transition-fast);
    box-sizing: border-box;
}

/* --- 7. Auth Modal & User Menu --- */
#auth-modal {
    position: fixed;
    inset: 0;
    display: none;
    align-items: center;
    justify-content: center;
    background: rgba(2, 6, 23, 0.85);
    z-index: 2000;
    backdrop-filter: blur(10px);
    padding: 1rem;
}

#auth-modal .modal {
    width: 100%;
    max-width: 420px;
    background: var(--card-bg);
    color: var(--text-color);
    padding: 2rem;
    border-radius: 1.5rem;
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--border-color);
    position: relative;
    backdrop-filter: blur(12px);
}

#auth-modal h3 {
    font-size: 1.5rem;
    font-weight: 800;
    margin: 0 0 1.5rem 0;
    text-align: center;
    letter-spacing: -0.025em;
}

#auth-modal input {
    width: 100%;
    padding: 0.75rem 1rem;
    margin-bottom: 0.75rem;
    border-radius: 0.75rem;
    border: 1px solid var(--border-color);
    background: var(--bg-color);
    color: var(--text-color);
    font-family: inherit;
    font-size: 0.9rem;
    transition: var(--transition-fast);
    box-sizing: border-box;
}

#auth-modal input:focus {
    outline: none;
    border-color: var(--cyan);
    box-shadow: 0 0 0 3px rgba(6, 182, 212, 0.15);
    transform: translateY(-1px);
}

#auth-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: var(--toggle-btn-bg);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    font-size: 1.1rem;
    cursor: pointer;
    width: 32px;
    height: 32px;
    border-radius: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-fast);
}

#auth-close:hover {
    background: var(--border-color);
    transform: rotate(90deg);
}

#auth-actions {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-top: 1.25rem;
}

#auth-submit {
    background: linear-gradient(135deg, var(--cyan), var(--purple));
    color: white;
    box-shadow: 0 4px 12px rgba(6, 182, 212, 0.3);
    width: 100%;
    padding: 0.8rem;
    border-radius: 0.75rem;
    font-weight: 700;
    border: none;
    cursor: pointer;
}

#auth-switch {
    background: var(--toggle-btn-bg);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    width: 100%;
    padding: 0.8rem;
    border-radius: 0.75rem;
    font-weight: 600;
    cursor: pointer;
}

.btn-account {
    background: var(--toggle-btn-bg);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    padding: 0.4rem 0.8rem;
    border-radius: 0.75rem;
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition-fast);
    font-size: 0.85rem;
}

#user-menu {
    position: relative;
}

#user-menu.hidden {
    display: none;
}

#user-btn {
    background: var(--toggle-btn-bg);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    padding: 0.4rem 0.8rem;
    border-radius: 0.75rem;
    cursor: pointer;
    display: flex;
    gap: 0.5rem;
    align-items: center;
    font-weight: 600;
    transition: var(--transition-fast);
    font-size: 0.85rem;
}

#user-avatar {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--cyan), var(--purple));
    color: white;
    font-weight: 800;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.65rem;
}

.profile-panel {
    position: absolute;
    right: 0;
    top: calc(100% + 1rem);
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 1.5rem;
    border-radius: 1rem;
    width: 240px;
    box-shadow: var(--shadow-xl);
    z-index: 2100;
    opacity: 0;
    transform: translateY(-10px);
    transition: var(--transition-fast);
    pointer-events: none;
    visibility: hidden;
    backdrop-filter: blur(12px);
}

.profile-panel.open {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
    visibility: visible;
}

/* --- 8. Footer --- */
.footer {
    padding: 4rem 0;
    border-top: 1px solid var(--border-color);
    background-color: var(--bg-color);
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
    text-align: center;
}

.footer-socials {
    display: flex;
    gap: 1.5rem;
}

.social-link {
    font-size: 1.5rem;
    color: var(--text-color-light);
    transition: var(--transition-fast);
}

.social-link:hover {
    color: var(--cyan);
    transform: translateY(-3px);
}

/* --- 9. Utility Classes --- */
.text-cyan {
    color: var(--cyan);
}

.text-purple {
    color: var(--purple);
}

.text-pink {
    color: var(--pink);
}

/* Neon glow for colored headline text (subtle) */
.text-cyan.neon-effect {
    color: var(--cyan);
    text-shadow: 0 0 6px var(--cyan-glow), 0 0 18px var(--cyan-glow);
    transition: text-shadow 0.25s ease;
}

.text-purple.neon-effect {
    color: var(--purple);
    text-shadow: 0 0 6px var(--purple-glow), 0 0 18px var(--purple-glow);
    transition: text-shadow 0.25s ease;
}

.text-pink.neon-effect {
    color: var(--pink);
    text-shadow: 0 0 6px var(--pink-glow), 0 0 18px var(--pink-glow);
    transition: text-shadow 0.25s ease;
}

/* Fallback for plain .neon-effect spans without a text- color utility */
.neon-effect:not([class*="text-"]) {
    color: var(--cyan);
    text-shadow: 0 0 6px var(--cyan-glow), 0 0 14px var(--cyan-glow);
}

/* Reduce glow on bright/light theme to preserve contrast */
[data-theme="bright"] .text-cyan.neon-effect,
[data-theme="bright"] .neon-effect:not([class*="text-"]) {
    text-shadow: 0 0 4px rgba(34,211,238,0.55);
    opacity: 0.95;
}

.bg-cyan-light {
    background-color: rgba(6, 182, 212, 0.1);
    color: var(--cyan);
}

.bg-purple-light {
    background-color: rgba(139, 92, 246, 0.1);
    color: var(--purple);
}

.bg-pink-light {
    background-color: rgba(236, 72, 153, 0.1);
    color: var(--pink);
}

/* --- 10. Responsive Styles --- */
@media (min-width: 768px) {
    .footer-content {
        flex-direction: row;
        justify-content: space-between;
        text-align: left;
    }
}

@media (max-width: 768px) {
    .main-nav {
        display: none !important;
    }

    .hamburger {
        display: flex;
    }

    .header {
        width: 96%;
        padding: 0.3rem 0.5rem;
        top: 0.5rem;
        border-radius: 0.75rem;
        gap: 0.3rem;
    }

    /* Prevent expansion on scroll for mobile */
    @media (max-width: 500px) {
        .header.scrolled {
            width: 96%;
            top: 0.5rem;
            padding: 0.3rem 0.5rem;
        }
    }

    .logo-text {
        font-size: 0.85rem;
    }

    .header-actions {
        gap: 0.3rem;
    }

    .btn {
        padding: 0.25rem 0.5rem;
        font-size: 0.7rem;
        white-space: nowrap;
    }

    .btn-account {
        padding: 0.35rem 0.7rem;
        font-size: 0.8rem;
    }

    .theme-toggle-btn {
        width: 32px;
        height: 32px;
    }

    .hero {
        padding: 3rem 0;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .content-wrapper {
        padding-top: 70px;
    }

    .features-grid,
    .test-grid {
        grid-template-columns: 1fr;
    }

    #auth-modal .modal {
        padding: 1.5rem;
        max-width: 90%;
    }
}

/* Back to Top Button */
#back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 3rem;
    height: 3rem;
    background: var(--toggle-btn-bg);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-fast);
    box-shadow: var(--shadow-lg);
    transform: translateY(20px);
}

#back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

#back-to-top:hover {
    background: var(--border-color);
    transform: translateY(-5px);
}