/* ============================================
   KUNAIDEX PRE-LAUNCH LANDING PAGE
   Professional Development UI Upgrade
   NOTE: Existing color palette intentionally preserved.
   ============================================ */

:root {
    /* Existing Color Palette — unchanged */
    --color-bg-primary: #050505;
    --color-bg-secondary: #050505;
    --color-accent: #b45309;
    --color-accent-dark: #b91c1c;
    --color-text-primary: #f5f5f5;
    --color-text-secondary: #a8a8a8;
    --color-text-tertiary: #808080;
    --color-border: rgba(255, 255, 255, 0.08);
    --color-border-light: rgba(255, 255, 255, 0.04);

    /* Layout */
    --container-width: 1180px;
    --content-width: 680px;
    --page-gutter: clamp(1rem, 4vw, 2rem);
    --header-height: 72px;

    /* Spacing system */
    --spacing-2xs: 0.25rem;
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4.5rem;
    --spacing-4xl: 6rem;

    /* Typography */
    --font-family-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.375rem;
    --font-size-2xl: clamp(1.75rem, 3vw, 2.5rem);
    --font-size-3xl: clamp(2.5rem, 5vw, 4.75rem);

    /* Shape */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-pill: 999px;

    /* Motion */
    --transition-fast: 160ms cubic-bezier(0.2, 0.8, 0.2, 1);
    --transition-normal: 280ms cubic-bezier(0.2, 0.8, 0.2, 1);
    --transition-slow: 420ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

/* ============================================
   RESET / BASE
   ============================================ */

*,
*::before,
*::after {
    box-sizing: border-box;
}

* {
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    text-size-adjust: 100%;
    -webkit-text-size-adjust: 100%;
}

body {
    min-width: 320px;
    min-height: 100vh;
    font-family: var(--font-family-sans);
    background-color: var(--color-bg-primary);
    color: var(--color-text-primary);
    font-size: var(--font-size-base);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

button,
input,
textarea,
select {
    font: inherit;
}

button,
input {
    border: 0;
}

button {
    cursor: pointer;
}

button:disabled {
    cursor: not-allowed;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    color: var(--color-text-primary);
    font-weight: 650;
    line-height: 1.15;
    text-wrap: balance;
}

h1 {
    font-size: var(--font-size-3xl);
}

h2 {
    font-size: var(--font-size-2xl);
}

h3 {
    font-size: var(--font-size-xl);
}

p {
    color: var(--color-text-secondary);
    text-wrap: pretty;
}

a {
    color: var(--color-accent);
    text-decoration: none;
    text-underline-offset: 0.2em;
    transition: color var(--transition-fast), opacity var(--transition-fast);
}

a:hover {
    color: var(--color-accent-dark);
}

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

:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 3px;
}

.sr-only {
    position: absolute !important;
    width: 1px !important;
    height: 1px !important;
    padding: 0 !important;
    margin: -1px !important;
    overflow: hidden !important;
    clip: rect(0, 0, 0, 0) !important;
    white-space: nowrap !important;
    border: 0 !important;
}

/* ============================================
   SHARED BUTTONS
   ============================================ */

.btn {
    min-height: 52px;
    padding: 0.875rem 1.25rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: 700;
    line-height: 1;
    letter-spacing: 0.01em;
    text-align: center;
    user-select: none;
    transition:
        transform var(--transition-fast),
        box-shadow var(--transition-fast),
        opacity var(--transition-fast),
        border-color var(--transition-fast);
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-dark) 100%);
    color: white;
}

.btn-primary:hover {
    color: white;
    transform: translateY(-1px);
    box-shadow: 0 10px 24px rgba(212, 165, 0, 0.2);
}

.btn-primary:active {
    transform: translateY(0) scale(0.995);
    box-shadow: 0 5px 14px rgba(212, 165, 0, 0.14);
}

.btn:disabled,
.btn[aria-disabled="true"] {
    opacity: 0.55;
    transform: none;
    box-shadow: none;
}

.btn-submit {
    position: relative;
    width: 100%;
    min-height: 54px;
}

/* ============================================
   HEADER
   ============================================ */

.header {
    position: sticky;
    top: 0;
    z-index: 1000;
    width: 100%;
    min-height: var(--header-height);
    display: flex;
    align-items: center;
    background: rgba(5, 5, 5, 0.95);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--color-border-light);
}

.header-container {
    width: min(100%, calc(var(--container-width) + (var(--page-gutter) * 2)));
    min-height: var(--header-height);
    margin-inline: auto;
    padding-inline: var(--page-gutter);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-lg);
}

.logo-section {
    min-width: 0;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo-image {
    width: auto;
    height: 34px;
    object-fit: contain;
    flex-shrink: 0;
}

.header-nav {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: var(--spacing-md);
}

.lang-switcher {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.125rem;
    padding: 0.25rem;
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-pill);
}

.lang-btn {
    min-width: 38px;
    min-height: 30px;
    padding: 0.35rem 0.55rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    color: var(--color-text-secondary);
    border-radius: var(--radius-pill);
    font-size: var(--font-size-xs);
    font-weight: 700;
    line-height: 1;
    letter-spacing: 0.04em;
    transition:
        color var(--transition-fast),
        background var(--transition-fast),
        transform var(--transition-fast);
}

.lang-btn:hover {
    color: var(--color-text-primary);
}

.lang-btn.active {
    color: var(--color-accent);
}

.lang-btn:active {
    transform: scale(0.96);
}

.lang-divider {
    color: var(--color-text-tertiary);
    opacity: 0.5;
    user-select: none;
}

/* ============================================
   HERO
   ============================================ */

.hero {
    isolation: isolate;
    position: relative;
    width: min(100%, calc(var(--container-width) + (var(--page-gutter) * 2)));
    min-height: calc(100svh - var(--header-height));
    margin-inline: auto;
    padding:
        clamp(3.5rem, 8vh, 7rem)
        var(--page-gutter)
        clamp(4rem, 9vh, 7.5rem);
    display: grid;
    grid-template-columns: minmax(0, 1.03fr) minmax(360px, 0.97fr);
    align-items: center;
    gap: clamp(3rem, 7vw, 6.5rem);
}

.hero::before {
    content: "";
    position: absolute;
    z-index: -1;
    top: -18%;
    right: -14%;
    width: min(44vw, 620px);
    aspect-ratio: 1;
    background: radial-gradient(circle, rgba(212, 165, 0, 0.06) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 2;
    width: 100%;
    max-width: var(--content-width);
}

.hero-badge {
    width: fit-content;
    margin-bottom: var(--spacing-lg);
    padding: 0.45rem 0.8rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid rgba(212, 165, 0, 0.25);
    border-radius: var(--radius-pill);
    background: rgba(212, 165, 0, 0.08);
    color: var(--color-accent);
    font-size: var(--font-size-xs);
    font-weight: 800;
    line-height: 1;
    letter-spacing: 0.09em;
    text-transform: uppercase;
}

.hero-title {
    max-width: 13ch;
    margin-bottom: var(--spacing-lg);
    font-size: var(--font-size-3xl);
    font-weight: 700;
    line-height: 1.02;
    letter-spacing: -0.04em;
}

.hero-subtitle {
    max-width: 58ch;
    margin-bottom: var(--spacing-xl);
    color: var(--color-text-secondary);
    font-size: clamp(1rem, 1.5vw, 1.125rem);
    line-height: 1.75;
}

/* ============================================
   WAITLIST FORM
   ============================================ */

.waitlist-form-inline {
    position: relative;
    z-index: 3;
    width: 100%;
    max-width: 560px;
    margin-bottom: var(--spacing-md);
}

.form-row {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: var(--spacing-sm);
}

.form-group {
    position: relative;
    width: 100%;
}

.form-group input {
    position: relative;
    z-index: 1;
    width: 100%;
    min-height: 56px;
    padding: 0.95rem 1.05rem;
    background: linear-gradient(135deg, rgba(40, 35, 20, 0.8), rgba(50, 45, 25, 0.9));
    border: 1px solid rgba(212, 165, 0, 0.25);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    font-size: var(--font-size-base);
    font-weight: 500;
    line-height: 1.4;
    caret-color: var(--color-accent);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.03);
    outline: none;
    transition:
        border-color var(--transition-fast),
        box-shadow var(--transition-fast),
        background var(--transition-fast),
        transform var(--transition-fast);
}

.form-group input::placeholder {
    color: var(--color-text-tertiary);
    font-weight: 400;
    opacity: 1;
}

.form-group input:hover:not(:focus) {
    border-color: rgba(212, 165, 0, 0.4);
    background: linear-gradient(135deg, rgba(45, 40, 25, 0.9), rgba(55, 50, 30, 0.95));
}

.form-group input:focus {
    border-color: var(--color-accent);
    background: linear-gradient(135deg, rgba(50, 45, 25, 1), rgba(60, 55, 35, 1));
    box-shadow:
        0 0 0 3px rgba(212, 165, 0, 0.12),
        0 8px 24px rgba(0, 0, 0, 0.2);
    transform: translateY(-1px);
}

.form-group input:disabled {
    opacity: 0.55;
    cursor: not-allowed;
}

.form-group input[aria-invalid="true"] {
    border-color: #ef4444;
}

.form-error {
    display: none;
    margin-top: 0.45rem;
    padding-left: 0.15rem;
    color: #ef4444;
    font-size: var(--font-size-xs);
    font-weight: 500;
    line-height: 1.45;
}

.form-error[aria-live]:not(:empty),
.form-error.is-visible {
    display: block;
}

.waitlist-consent {
    max-width: 58ch;
    margin-bottom: var(--spacing-lg);
    color: var(--color-text-tertiary);
    font-size: var(--font-size-xs);
    line-height: 1.6;
}

/* ============================================
   FORM STATUS MESSAGES
   ============================================ */

.success-message,
.error-message {
    display: none;
    width: 100%;
    max-width: 560px;
    margin-top: var(--spacing-sm);
    padding: 0.95rem 1rem;
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    line-height: 1.55;
    animation: statusEnter var(--transition-normal) both;
}

.success-message.is-visible,
.error-message.is-visible {
    display: block;
}

.success-message {
    background: rgba(34, 197, 94, 0.1);
    border: 1px solid rgba(34, 197, 94, 0.3);
    color: #22c55e;
}

.error-message {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: #ef4444;
}

.success-icon {
    width: 26px;
    height: 26px;
    margin-bottom: var(--spacing-xs);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: #22c55e;
    color: white;
    font-size: 0.75rem;
    font-weight: 800;
}

@keyframes statusEnter {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ============================================
   HERO VISUAL / BANNER
   ============================================ */

.hero-visual {
    position: relative;
    z-index: 1;
    width: 100%;
    min-width: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.banner-container {
    position: relative;
    width: 100%;
    max-width: 520px;
    margin-inline: auto;
    overflow: hidden;
    border-radius: var(--radius-lg);
}

.banner-container::after {
    content: "";
    position: absolute;
    inset: 0;
    border: 1px solid rgba(212, 165, 0, 0.2);
    border-radius: inherit;
    pointer-events: none;
}

.banner-image {
    width: 100%;
    height: auto;
    aspect-ratio: auto;
    object-fit: cover;
    border-radius: inherit;
    transform: translateZ(0);
    box-shadow:
        0 22px 70px rgba(0, 0, 0, 0.48),
        0 0 24px rgba(212, 165, 0, 0.12);
    transition:
        transform var(--transition-slow),
        box-shadow var(--transition-slow);
}

.banner-container:hover .banner-image {
    transform: scale(1.012);
    box-shadow:
        0 28px 80px rgba(0, 0, 0, 0.56),
        0 0 30px rgba(212, 165, 0, 0.18);
}

/* ============================================
   CAPABILITIES
   ============================================ */

.capabilities {
    position: relative;
    width: 100%;
    padding: clamp(4rem, 8vw, 7rem) var(--page-gutter);
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.capabilities-grid {
    width: min(100%, var(--container-width));
    margin-inline: auto;
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1px;
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.capability-item {
    min-width: 0;
    min-height: 220px;
    padding: clamp(1.5rem, 3vw, 2.25rem);
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    text-align: left;
    border-right: 1px solid var(--color-border-light);
    transition:
        transform var(--transition-normal),
        background var(--transition-normal);
}

.capability-item:last-child {
    border-right: 0;
}

.capability-item:hover {
    transform: translateY(-2px);
    background: rgba(255, 255, 255, 0.015);
}

.capability-icon {
    width: 42px;
    height: 42px;
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-accent);
    flex-shrink: 0;
}

.capability-icon svg {
    width: 100%;
    height: 100%;
    stroke: currentColor;
}

.capability-item h3 {
    margin-bottom: var(--spacing-xs);
    color: var(--color-text-primary);
    font-size: 1rem;
    font-weight: 700;
    line-height: 1.4;
    letter-spacing: -0.01em;
}

.capability-item p {
    max-width: 30ch;
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    line-height: 1.7;
}

/* ============================================
   FOOTER
   ============================================ */

.footer {
    width: 100%;
    padding: 2rem var(--page-gutter);
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border-light);
}

.footer-content {
    width: min(100%, var(--container-width));
    margin-inline: auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-lg);
    color: var(--color-text-secondary);
    font-size: var(--font-size-xs);
    line-height: 1.5;
}

.footer-content > div {
    color: var(--color-text-secondary);
}

.footer-email {
    color: var(--color-accent);
    font-weight: 600;
    transition: color var(--transition-fast), opacity var(--transition-fast);
}

.footer-email:hover {
    color: var(--color-accent-dark);
}

/* ============================================
   RESPONSIVE — TABLET / SMALL DESKTOP
   ============================================ */

@media (max-width: 1024px) {
    :root {
        --header-height: 68px;
    }

    .hero {
        grid-template-columns: minmax(0, 1fr) minmax(320px, 0.9fr);
        gap: clamp(2rem, 5vw, 4rem);
    }

    .hero-title {
        font-size: clamp(2.5rem, 5vw, 3.75rem);
    }

    .capabilities-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .capability-item:nth-child(2) {
        border-right: 0;
    }

    .capability-item:nth-child(-n + 2) {
        border-bottom: 1px solid var(--color-border-light);
    }
}

/* ============================================
   RESPONSIVE — TABLET
   ============================================ */

@media (max-width: 820px) {
    .hero {
        min-height: auto;
        padding-top: 2.5rem;
        padding-bottom: 4.5rem;
        grid-template-columns: 1fr;
        gap: 2.5rem;
    }

    .hero-content {
        max-width: 680px;
    }

    .hero-visual {
        order: -1;
    }

    .banner-container {
        max-width: 640px;
    }

    .hero-title {
        max-width: 16ch;
        font-size: clamp(2.35rem, 8vw, 3.6rem);
    }

    .hero-subtitle,
    .waitlist-form-inline,
    .success-message,
    .error-message {
        max-width: 620px;
    }

    .capabilities {
        padding-block: 4rem;
    }

    .footer-content {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-xs);
    }
}

/* ============================================
   RESPONSIVE — MOBILE
   ============================================ */

@media (max-width: 640px) {
    :root {
        --header-height: 62px;
        --page-gutter: 1rem;
    }

    .header-container {
        gap: var(--spacing-sm);
    }

    .logo-image {
        height: 28px;
    }

    .lang-switcher {
        padding: 0.2rem;
    }

    .lang-btn {
        min-width: 34px;
        min-height: 28px;
        padding: 0.3rem 0.45rem;
    }

    .hero {
        padding-top: 1.25rem;
        padding-bottom: 3.5rem;
        gap: 2rem;
    }

    .hero::before {
        top: -6%;
        right: -42%;
        width: 500px;
    }

    .hero-badge {
        margin-bottom: 1rem;
        padding: 0.4rem 0.7rem;
        font-size: 0.6875rem;
    }

    .hero-title {
        margin-bottom: 1rem;
        font-size: clamp(2rem, 11vw, 2.85rem);
        line-height: 1.05;
        letter-spacing: -0.035em;
    }

    .hero-subtitle {
        margin-bottom: 1.5rem;
        font-size: 0.95rem;
        line-height: 1.7;
    }

    .form-row {
        gap: 0.65rem;
    }

    .form-group input,
    .btn-submit {
        min-height: 52px;
        font-size: 0.9375rem;
    }

    .form-group input {
        padding-inline: 0.95rem;
    }

    .waitlist-consent {
        margin-bottom: 1.25rem;
        font-size: 0.72rem;
    }

    .banner-container {
        border-radius: var(--radius-md);
    }

    .capabilities {
        padding: 3rem var(--page-gutter);
    }

    .capabilities-grid {
        grid-template-columns: 1fr;
        border-radius: var(--radius-md);
    }

    .capability-item {
        min-height: auto;
        padding: 1.5rem;
        border-right: 0;
        border-bottom: 1px solid var(--color-border-light);
    }

    .capability-item:nth-child(2) {
        border-right: 0;
    }

    .capability-item:last-child {
        border-bottom: 0;
    }

    .capability-icon {
        width: 38px;
        height: 38px;
        margin-bottom: 1rem;
    }

    .capability-item p {
        max-width: none;
    }

    .footer {
        padding-block: 1.5rem;
    }

    .footer-content {
        font-size: 0.72rem;
    }
}

/* ============================================
   VERY SMALL DEVICES
   ============================================ */

@media (max-width: 380px) {
    .logo-image {
        height: 25px;
    }

    .hero-title {
        font-size: 1.95rem;
    }

    .lang-btn {
        min-width: 31px;
        padding-inline: 0.35rem;
    }
}

/* ============================================
   POINTER / MOTION ACCESSIBILITY
   ============================================ */

@media (hover: none) {
    .btn-primary:hover,
    .capability-item:hover,
    .banner-container:hover .banner-image {
        transform: none;
    }
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        scroll-behavior: auto !important;
        transition-duration: 0.01ms !important;
    }
}

/* ============================================
   PRINT
   ============================================ */

@media print {
    .header,
    .btn-primary,
    .waitlist-form-inline,
    .success-message,
    .error-message {
        display: none !important;
    }

    body {
        background: white;
        color: black;
    }

    .hero {
        min-height: auto;
        display: block;
        padding: 2rem 0;
    }

    .capabilities {
        border: 0;
        padding: 2rem 0;
    }
}