/* ============================================
   cetin.info — Styles
   Refined minimalist, professional, fast
   ============================================ */

/* --- Custom Properties --- */
:root {
    --navy: #1B2A4A;
    --navy-light: #2A3F6A;
    --navy-dark: #0F1B33;
    --navy-muted: #3D5280;
    --white: #FFFFFF;
    --gray-50: #F7F8FC;
    --gray-100: #ECEEF5;
    --gray-200: #D4D8E4;
    --gray-400: #8C95AB;
    --gray-500: #6B7490;
    --gray-700: #3A4259;
    --gray-800: #252D3F;

    --font-body: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    --fs-xs: 0.75rem;
    --fs-sm: 0.875rem;
    --fs-base: 1rem;
    --fs-lg: 1.125rem;
    --fs-xl: 1.25rem;
    --fs-2xl: 1.5rem;
    --fs-3xl: 2rem;
    --fs-4xl: 2.75rem;
    --fs-5xl: 3.5rem;
    --fs-stat: 2.25rem;

    --fw-light: 300;
    --fw-regular: 400;
    --fw-medium: 500;
    --fw-semibold: 600;
    --fw-bold: 700;

    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 5rem;
    --spacing-3xl: 8rem;

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 20px;

    --shadow-sm: 0 1px 3px rgba(27, 42, 74, 0.05), 0 1px 2px rgba(27, 42, 74, 0.03);
    --shadow-md: 0 4px 16px rgba(27, 42, 74, 0.07), 0 2px 4px rgba(27, 42, 74, 0.04);
    --shadow-lg: 0 12px 40px rgba(27, 42, 74, 0.1), 0 4px 12px rgba(27, 42, 74, 0.05);
    --shadow-xl: 0 20px 60px rgba(27, 42, 74, 0.12), 0 8px 20px rgba(27, 42, 74, 0.06);

    --transition-fast: 0.2s ease;
    --transition-base: 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --transition-slow: 0.7s cubic-bezier(0.16, 1, 0.3, 1);

    --nav-height: 80px;
}

/* --- Reset & Base --- */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--nav-height);
}

body {
    font-family: var(--font-body);
    font-size: var(--fs-base);
    font-weight: var(--fw-regular);
    line-height: 1.7;
    color: var(--gray-700);
    background-color: var(--white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

ul {
    list-style: none;
}

/* --- Utilities --- */
.container {
    width: 100%;
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.section {
    padding: var(--spacing-3xl) 0;
    position: relative;
}

/* --- Reveal Animations --- */
.reveal {
    opacity: 0;
    transform: translateY(28px);
    transition: opacity var(--transition-slow), transform var(--transition-slow);
}

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

.reveal--delay-1 {
    transition-delay: 0.15s;
}

.reveal--delay-2 {
    transition-delay: 0.3s;
}

.reveal--delay-3 {
    transition-delay: 0.45s;
}

/* --- Navigation --- */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(16px) saturate(180%);
    -webkit-backdrop-filter: blur(16px) saturate(180%);
    z-index: 1000;
    transition: box-shadow var(--transition-base), background var(--transition-base);
}

.nav--scrolled {
    box-shadow: 0 1px 0 rgba(27, 42, 74, 0.06);
    background: rgba(255, 255, 255, 0.97);
}

.nav__container {
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav__logo {
    display: flex;
    align-items: center;
}

.nav__logo-img {
    height: 44px;
    width: auto;
}

.nav__links {
    display: flex;
    align-items: center;
    gap: 2.5rem;
}

.nav__link {
    font-size: var(--fs-sm);
    font-weight: var(--fw-medium);
    color: var(--gray-500);
    letter-spacing: 0.02em;
    transition: color var(--transition-fast);
    position: relative;
}

.nav__link::after {
    content: '';
    position: absolute;
    bottom: -6px;
    left: 0;
    width: 0;
    height: 1.5px;
    background: var(--navy);
    transition: width var(--transition-base);
}

.nav__link:hover {
    color: var(--navy);
}

.nav__link:hover::after {
    width: 100%;
}

/* Mobile Toggle */
.nav__toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    z-index: 1001;
}

.nav__toggle-bar {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--navy);
    border-radius: 2px;
    transition: transform var(--transition-base), opacity var(--transition-base);
}

.nav__toggle--active .nav__toggle-bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.nav__toggle--active .nav__toggle-bar:nth-child(2) {
    opacity: 0;
}

.nav__toggle--active .nav__toggle-bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* --- Hero --- */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding: calc(var(--nav-height) + var(--spacing-2xl)) var(--spacing-lg) var(--spacing-2xl);
    background: var(--white);
    overflow: hidden;
}

/* Subtle dot grid pattern */
.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: radial-gradient(circle, rgba(27, 42, 74, 0.045) 1px, transparent 1px);
    background-size: 32px 32px;
    mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, black 20%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, black 20%, transparent 70%);
    pointer-events: none;
}

/* Soft gradient wash */
.hero::after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 50%;
    height: 100%;
    background: radial-gradient(ellipse at 80% 20%, rgba(27, 42, 74, 0.03) 0%, transparent 60%);
    pointer-events: none;
}

.hero__container {
    max-width: 820px;
    text-align: center;
    position: relative;
    z-index: 1;
}

.hero__title {
    font-size: clamp(var(--fs-3xl), 5.5vw, var(--fs-5xl));
    font-weight: var(--fw-bold);
    line-height: 1.12;
    color: var(--navy);
    letter-spacing: -0.03em;
    margin-bottom: var(--spacing-md);
}

.hero__title-accent {
    color: var(--navy-muted);
    font-weight: var(--fw-medium);
}

.hero__divider {
    width: 48px;
    height: 2px;
    background: var(--navy-light);
    margin: var(--spacing-md) auto var(--spacing-lg);
    opacity: 0.4;
}

.hero__subtitle {
    font-size: clamp(var(--fs-lg), 2.2vw, var(--fs-xl));
    font-weight: var(--fw-light);
    color: var(--gray-500);
    line-height: 1.65;
    max-width: 580px;
    margin: 0 auto var(--spacing-xl);
}

.hero__cta {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
}

.hero__scroll-indicator {
    position: absolute;
    bottom: var(--spacing-xl);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    opacity: 0.35;
    transition: opacity var(--transition-base);
    z-index: 1;
}

.hero__scroll-indicator:hover {
    opacity: 0.6;
}

.hero__scroll-text {
    font-size: 0.65rem;
    font-weight: var(--fw-semibold);
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--navy);
}

.hero__scroll-line {
    width: 1px;
    height: 36px;
    position: relative;
    overflow: hidden;
}

.hero__scroll-line::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--navy);
    animation: scrollDrop 2.2s cubic-bezier(0.65, 0, 0.35, 1) infinite;
}

@keyframes scrollDrop {
    0% { transform: translateY(-100%); }
    40% { transform: translateY(0); }
    80%, 100% { transform: translateY(100%); }
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: 14px 34px;
    font-family: var(--font-body);
    font-size: var(--fs-sm);
    font-weight: var(--fw-semibold);
    letter-spacing: 0.01em;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
    white-space: nowrap;
}

.btn--primary {
    background: var(--navy);
    color: var(--white);
}

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

.btn--outline {
    background: transparent;
    color: var(--navy);
    border: 1.5px solid var(--gray-200);
}

.btn--outline:hover {
    border-color: var(--navy);
    background: rgba(27, 42, 74, 0.03);
    transform: translateY(-2px);
}

.btn--linkedin {
    background: #0A66C2;
    color: var(--white);
    padding: 12px 24px;
}

.btn--linkedin:hover {
    background: #004182;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn--full {
    width: 100%;
}

/* --- Section Header --- */
.section__header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section__label {
    display: inline-block;
    font-size: var(--fs-xs);
    font-weight: var(--fw-semibold);
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--navy-muted);
    margin-bottom: var(--spacing-sm);
}

.section__title {
    font-size: clamp(var(--fs-2xl), 3.5vw, var(--fs-4xl));
    font-weight: var(--fw-bold);
    color: var(--navy);
    letter-spacing: -0.025em;
    line-height: 1.15;
}

.section__subtitle {
    font-size: var(--fs-lg);
    font-weight: var(--fw-light);
    color: var(--gray-500);
    max-width: 540px;
    margin: var(--spacing-sm) auto 0;
    line-height: 1.65;
}

/* --- About --- */
.about {
    background: var(--white);
}

.about__content {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: var(--spacing-2xl);
    align-items: start;
}

.about__lead {
    font-size: var(--fs-xl);
    font-weight: var(--fw-regular);
    color: var(--navy);
    line-height: 1.7;
    margin-bottom: var(--spacing-lg);
}

.about__text p {
    margin-bottom: var(--spacing-sm);
    color: var(--gray-500);
    line-height: 1.75;
}

.about__text p:last-child {
    margin-bottom: 0;
}

.about__highlights {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    padding-top: var(--spacing-xs);
}

.about__highlight {
    padding: var(--spacing-md) var(--spacing-lg);
    border-left: 2px solid var(--gray-200);
    transition: border-color var(--transition-base), transform var(--transition-base);
}

.about__highlight:hover {
    border-color: var(--navy);
    transform: translateX(4px);
}

.about__highlight-number {
    display: block;
    font-size: var(--fs-stat);
    font-weight: var(--fw-bold);
    color: var(--navy);
    line-height: 1.1;
    letter-spacing: -0.02em;
}

.about__highlight-label {
    display: block;
    font-size: var(--fs-sm);
    color: var(--gray-500);
    font-weight: var(--fw-medium);
    margin-top: 4px;
}

/* --- Services --- */
.services {
    background: var(--gray-50);
}

.services__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.service-card {
    background: var(--white);
    padding: var(--spacing-xl) var(--spacing-lg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-100);
    transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

.service-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.service-card__icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gray-50);
    border-radius: var(--radius-md);
    color: var(--navy);
    margin-bottom: var(--spacing-lg);
    transition: background var(--transition-base), color var(--transition-base), transform var(--transition-base);
}

.service-card:hover .service-card__icon {
    background: var(--navy);
    color: var(--white);
    transform: scale(1.05);
}

.service-card__title {
    font-size: var(--fs-xl);
    font-weight: var(--fw-semibold);
    color: var(--navy);
    margin-bottom: var(--spacing-sm);
    line-height: 1.3;
    letter-spacing: -0.01em;
}

.service-card__description {
    font-size: var(--fs-sm);
    color: var(--gray-500);
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
}

.service-card__list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.service-card__list li {
    font-size: var(--fs-sm);
    color: var(--gray-500);
    padding-left: var(--spacing-md);
    position: relative;
    font-weight: var(--fw-medium);
}

.service-card__list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 9px;
    width: 6px;
    height: 2px;
    background: var(--navy-muted);
    border-radius: 1px;
}

/* --- Contact --- */
.contact {
    background: var(--white);
}

.contact__content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: start;
}

/* Form */
.contact__form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.form__group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form__label {
    font-size: var(--fs-sm);
    font-weight: var(--fw-medium);
    color: var(--navy);
}

.form__input {
    padding: 13px 16px;
    font-family: var(--font-body);
    font-size: var(--fs-base);
    color: var(--gray-800);
    background: var(--gray-50);
    border: 1.5px solid var(--gray-200);
    border-radius: var(--radius-md);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
    outline: none;
}

.form__input:focus {
    border-color: var(--navy-light);
    box-shadow: 0 0 0 3px rgba(27, 42, 74, 0.06);
    background: var(--white);
}

.form__textarea {
    resize: vertical;
    min-height: 130px;
}

/* Contact Info */
.contact__info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.contact__info-card {
    padding: var(--spacing-lg) var(--spacing-xl);
    background: var(--gray-50);
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-100);
    transition: border-color var(--transition-base);
}

.contact__info-card:hover {
    border-color: var(--gray-200);
}

.contact__info-title {
    font-size: var(--fs-base);
    font-weight: var(--fw-semibold);
    color: var(--navy);
    margin-bottom: var(--spacing-xs);
}

.contact__info-text {
    font-size: var(--fs-sm);
    color: var(--gray-500);
    margin-bottom: var(--spacing-md);
    line-height: 1.65;
}

/* --- Footer --- */
.footer {
    background: var(--navy-dark);
    padding: var(--spacing-2xl) 0 var(--spacing-xl);
}

.footer__content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-lg);
}

.footer__logo {
    height: 30px;
    width: auto;
    filter: brightness(0) invert(1);
    opacity: 0.75;
    transition: opacity var(--transition-fast);
}

.footer__logo:hover {
    opacity: 1;
}

.footer__links {
    display: flex;
    gap: var(--spacing-xl);
}

.footer__link {
    font-size: var(--fs-sm);
    color: var(--gray-400);
    font-weight: var(--fw-medium);
    transition: color var(--transition-fast);
}

.footer__link:hover {
    color: var(--white);
}

.footer__copyright {
    font-size: var(--fs-xs);
    color: var(--gray-400);
    opacity: 0.5;
}

/* --- Responsive --- */
@media (max-width: 900px) {
    .services__grid {
        grid-template-columns: 1fr;
        max-width: 520px;
        margin: 0 auto;
    }

    .about__content {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }

    .about__highlights {
        flex-direction: row;
        flex-wrap: wrap;
        gap: var(--spacing-sm);
    }

    .about__highlight {
        flex: 1;
        min-width: 140px;
    }

    .contact__content {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
}

@media (max-width: 640px) {
    :root {
        --nav-height: 68px;
    }

    .section {
        padding: var(--spacing-2xl) 0;
    }

    .nav__logo-img {
        height: 36px;
    }

    .nav__toggle {
        display: flex;
    }

    .nav__links {
        position: fixed;
        top: 0;
        right: 0;
        width: 280px;
        height: 100vh;
        flex-direction: column;
        background: var(--white);
        padding: calc(var(--nav-height) + var(--spacing-xl)) var(--spacing-lg) var(--spacing-lg);
        box-shadow: var(--shadow-xl);
        transform: translateX(100%);
        transition: transform var(--transition-base);
        gap: var(--spacing-xs);
    }

    .nav__links--open {
        transform: translateX(0);
    }

    .nav__link {
        font-size: var(--fs-base);
        padding: var(--spacing-xs) 0;
    }

    .nav__link::after {
        display: none;
    }

    .hero {
        padding-top: calc(var(--nav-height) + var(--spacing-xl));
        min-height: calc(100vh - var(--spacing-lg));
    }

    .hero__cta {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        padding: 13px 28px;
    }

    .about__highlights {
        flex-direction: column;
    }

    .footer__links {
        gap: var(--spacing-sm);
        flex-wrap: wrap;
        justify-content: center;
    }
}

/* Reduce motion for accessibility */
@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

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

    .hero__scroll-line::after {
        animation: none;
    }

    .service-card:hover {
        transform: none;
    }

    .about__highlight:hover {
        transform: none;
    }
}