/* ==========================================
   ILYA CREATIVE - Photography Website
   Custom CSS Stylesheet
   ========================================== */

/* ==========================================
   CSS VARIABLES
   ========================================== */
:root {
    /* Colors - Blue Theme */
    --color-primary: #0a2540;           /* Deep Blue */
    --color-primary-light: #1a3a5c;     /* Medium Blue */
    --color-secondary: #4a90c2;         /* Light Blue */
    --color-accent: #6bb3e0;            /* Sky Blue */
    --color-white: #ffffff;
    --color-off-white: #f8fafc;
    --color-gray-light: #e2e8f0;
    --color-gray: #94a3b8;
    --color-gray-dark: #64748b;
    --color-text: #1e293b;
    --color-text-light: #475569;
    
    /* Typography */
    --font-heading: 'Playfair Display', serif;
    --font-body: 'Raleway', sans-serif;
    
    /* Font Sizes */
    --fs-h1: clamp(2.5rem, 5vw, 4rem);
    --fs-h2: clamp(1.75rem, 3vw, 2.5rem);
    --fs-h3: clamp(1.25rem, 2vw, 1.5rem);
    --fs-body: 1rem;
    --fs-small: 0.875rem;
    --fs-xs: 0.75rem;
    
    /* Spacing */
    --section-padding: 6rem;
    --container-max: 1200px;
    --container-padding: 1.5rem;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(10, 37, 64, 0.05);
    --shadow-md: 0 4px 6px rgba(10, 37, 64, 0.07);
    --shadow-lg: 0 10px 25px rgba(10, 37, 64, 0.1);
    --shadow-xl: 0 20px 40px rgba(10, 37, 64, 0.15);
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    
    /* Header Height */
    --header-height: 80px;
}

/* ==========================================
   RESET & BASE STYLES
   ========================================== */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--header-height);
    overflow-x: hidden;
}

body {
    font-family: var(--font-body);
    font-size: var(--fs-body);
    font-weight: 400;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
    min-height: 100vh;
}

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

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

ul {
    list-style: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

input,
textarea,
select {
    font-family: inherit;
    font-size: inherit;
}

/* ==========================================
   UTILITY CLASSES
   ========================================== */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

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

.section__header {
    text-align: center;
    margin-bottom: 3rem;
}

.section__subtitle {
    display: block;
    font-size: var(--fs-small);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--color-secondary);
    margin-bottom: 0.5rem;
}

.section__title {
    font-family: var(--font-heading);
    font-size: var(--fs-h2);
    font-weight: 600;
    color: var(--color-primary);
}

/* ==========================================
   BUTTONS
   ========================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 2rem;
    font-size: var(--fs-small);
    font-weight: 500;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    border-radius: var(--radius-sm);
    transition: all var(--transition-normal);
}

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

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

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

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

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

/* ==========================================
   HEADER & NAVIGATION
   ========================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background-color: var(--color-white);
    z-index: 1000;
    transition: box-shadow var(--transition-normal);
}

.header.scrolled {
    box-shadow: var(--shadow-md);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.nav__logo {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    color: var(--color-primary);
}

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

.nav__link {
    font-size: var(--fs-small);
    font-weight: 500;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--color-text);
    position: relative;
    transition: color var(--transition-fast);
}

.nav__link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-secondary);
    transition: width var(--transition-normal);
}

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

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

.nav__social-links {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-left: 1rem;
    padding-left: 1.5rem;
    border-left: 1px solid var(--color-gray-light);
}

.nav__social {
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text);
    transition: color var(--transition-fast);
}

.nav__social:hover {
    color: var(--color-secondary);
}

.nav__toggle,
.nav__close {
    display: none;
    cursor: pointer;
    color: var(--color-primary);
}

/* ==========================================
   HERO SECTION
   ========================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 80%, rgba(74, 144, 194, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(107, 179, 224, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.hero__content {
    text-align: center;
    padding: calc(var(--header-height) + 2rem) var(--container-padding) 4rem;
    position: relative;
    z-index: 1;
}

.hero__subtitle {
    display: inline-block;
    font-size: var(--fs-small);
    font-weight: 500;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: 1.5rem;
}

.hero__title {
    font-family: var(--font-heading);
    font-size: var(--fs-h1);
    font-weight: 500;
    line-height: 1.2;
    color: var(--color-white);
    margin-bottom: 1.5rem;
}

.hero__title span {
    font-style: italic;
    color: var(--color-accent);
}

.hero__description {
    max-width: 600px;
    margin: 0 auto 2.5rem;
    font-size: 1.125rem;
    font-weight: 300;
    color: rgba(255, 255, 255, 0.85);
    line-height: 1.8;
}

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

.hero .btn--primary:hover {
    background-color: var(--color-accent);
    color: var(--color-primary);
}

/* ==========================================
   PORTFOLIO SECTION
   ========================================== */
.portfolio {
    background-color: var(--color-off-white);
}

.portfolio__filters {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 3rem;
}

.portfolio__filter {
    padding: 0.625rem 1.25rem;
    font-size: var(--fs-small);
    font-weight: 500;
    letter-spacing: 0.05em;
    color: var(--color-text-light);
    background-color: transparent;
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.portfolio__filter:hover {
    color: var(--color-secondary);
}

.portfolio__filter.active {
    color: var(--color-primary);
    background-color: var(--color-white);
    border-color: var(--color-gray-light);
    box-shadow: var(--shadow-sm);
}

.portfolio__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
}

.portfolio__item {
    position: relative;
    aspect-ratio: 1 / 1;
    overflow: hidden;
    border-radius: var(--radius-md);
    cursor: pointer;
    background-color: var(--color-gray-light);
}

/* Fallback for browsers that don't support aspect-ratio */
@supports not (aspect-ratio: 1 / 1) {
    .portfolio__item {
        height: 0;
        padding-bottom: 100%;
    }
    
    .portfolio__item .portfolio__image {
        position: absolute;
        top: 0;
        left: 0;
    }
}

.portfolio__image {
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.portfolio__image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    display: block;
    transition: transform var(--transition-slow);
}

.portfolio__item:hover .portfolio__image img {
    transform: scale(1.05);
}

.portfolio__overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 1rem 1.25rem;
    background: linear-gradient(to top, rgba(10, 37, 64, 0.85) 0%, transparent 100%);
    transform: translateY(100%);
    transition: transform var(--transition-normal);
}

.portfolio__item:hover .portfolio__overlay {
    transform: translateY(0);
}

.portfolio__category {
    display: inline-block;
    font-size: var(--fs-small);
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-white);
}

/* Portfolio item hidden state for filtering */
.portfolio__item.hidden {
    display: none;
}

/* ==========================================
   SERVICES SECTION
   ========================================== */
.services {
    background-color: var(--color-white);
}

.services__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.service__card {
    position: relative;
    padding: 2.5rem 2rem;
    background-color: var(--color-white);
    border: 1px solid var(--color-gray-light);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: all var(--transition-normal);
}

.service__card:hover {
    border-color: var(--color-secondary);
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.service__card--featured {
    border-color: var(--color-primary);
    background: linear-gradient(180deg, var(--color-off-white) 0%, var(--color-white) 100%);
}

.service__badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    padding: 0.375rem 1rem;
    font-size: var(--fs-xs);
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--color-white);
    background-color: var(--color-secondary);
    border-radius: 20px;
}

.service__icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    margin-bottom: 1.5rem;
    color: var(--color-secondary);
    background-color: rgba(74, 144, 194, 0.1);
    border-radius: 50%;
}

.service__title {
    font-family: var(--font-heading);
    font-size: var(--fs-h3);
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 0.5rem;
}

.service__description {
    font-size: var(--fs-small);
    color: var(--color-text-light);
    margin-bottom: 1.5rem;
}

.service__features {
    margin-bottom: 2rem;
}

.service__features li {
    padding: 0.5rem 0;
    font-size: var(--fs-small);
    color: var(--color-text);
    border-bottom: 1px solid var(--color-gray-light);
}

.service__features li:last-child {
    border-bottom: none;
}

/* ==========================================
   CONTACT SECTION
   ========================================== */
.contact {
    background: linear-gradient(180deg, var(--color-off-white) 0%, var(--color-white) 100%);
}

.contact__content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: start;
}

.contact__text {
    font-size: var(--fs-body);
    color: var(--color-text-light);
    line-height: 1.8;
    margin-bottom: 2rem;
}

.contact__details {
    margin-bottom: 2rem;
}

.contact__detail {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.75rem 0;
    font-size: var(--fs-body);
    font-weight: 400;
    color: var(--color-text);
}

.contact__detail span {
    font-size: var(--fs-body);
    font-weight: 400;
}

.contact__detail svg {
    color: var(--color-secondary);
    flex-shrink: 0;
    width: 20px;
    height: 20px;
}

.contact__social {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.contact__social-link {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    font-size: var(--fs-body);
    font-weight: 400;
    color: var(--color-text);
    transition: color var(--transition-fast);
}

.contact__social-link span {
    font-size: var(--fs-body);
    font-weight: 400;
}

.contact__social-link:hover {
    color: var(--color-secondary);
}

.contact__social-link svg {
    color: var(--color-secondary);
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

/* Form Styles */
.contact__form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    padding: 2.5rem;
    background-color: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.form__group {
    position: relative;
}

.form__input {
    width: 100%;
    padding: 1rem 0;
    font-size: var(--fs-body);
    color: var(--color-text);
    background-color: transparent;
    border: none;
    border-bottom: 1px solid var(--color-gray-light);
    outline: none;
    transition: border-color var(--transition-fast);
}

.form__input:focus {
    border-color: var(--color-secondary);
}

.form__label {
    position: absolute;
    left: 0;
    top: 1rem;
    font-size: var(--fs-body);
    color: var(--color-gray);
    pointer-events: none;
    transition: all var(--transition-fast);
}

.form__input:focus + .form__label,
.form__input:not(:placeholder-shown) + .form__label {
    top: -0.5rem;
    font-size: var(--fs-xs);
    color: var(--color-secondary);
}

.form__select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0 center;
}

.form__textarea {
    min-height: 120px;
    resize: vertical;
}

/* ==========================================
   FOOTER
   ========================================== */
.footer {
    background-color: var(--color-primary);
    color: var(--color-white);
    padding: 3rem 0 1.5rem;
}

.footer__content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 2rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer__logo {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    color: var(--color-white);
}

.footer__tagline {
    font-size: var(--fs-small);
    color: rgba(255, 255, 255, 0.6);
    margin-top: 0.5rem;
}

.footer__social {
    display: flex;
    gap: 1rem;
}

.footer__social a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    color: var(--color-white);
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    transition: all var(--transition-fast);
}

.footer__social a:hover {
    background-color: var(--color-secondary);
    transform: translateY(-2px);
}

.footer__bottom {
    padding-top: 1.5rem;
    text-align: center;
}

.footer__bottom p {
    font-size: var(--fs-small);
    color: rgba(255, 255, 255, 0.5);
}

/* ==========================================
   RESPONSIVE DESIGN - TABLET
   ========================================== */
@media screen and (max-width: 1024px) {
    :root {
        --section-padding: 5rem;
    }
    
    .portfolio__grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 1rem;
    }
    
    .services__grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .contact__content {
        gap: 3rem;
    }
}

/* ==========================================
   RESPONSIVE DESIGN - TABLET SMALL
   ========================================== */
@media screen and (max-width: 900px) {
    .portfolio__grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }
    
    .contact__content {
        grid-template-columns: 1fr;
    }
    
    .contact__form {
        order: -1;
    }
}

/* ==========================================
   RESPONSIVE DESIGN - MOBILE LANDSCAPE
   ========================================== */
@media screen and (max-width: 768px) {
    :root {
        --section-padding: 4rem;
        --header-height: 70px;
    }
    
    /* Mobile Navigation */
    .nav__menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 320px;
        height: 100vh;
        padding: 6rem 2rem 2rem;
        background-color: var(--color-white);
        box-shadow: var(--shadow-xl);
        transition: right var(--transition-normal);
        z-index: 100;
        overflow-y: auto;
    }
    
    .nav__menu.show-menu {
        right: 0;
    }
    
    .nav__list {
        flex-direction: column;
        align-items: flex-start;
        gap: 0;
    }
    
    .nav__item {
        width: 100%;
    }
    
    .nav__link {
        display: block;
        padding: 1rem 0;
        font-size: var(--fs-body);
        border-bottom: 1px solid var(--color-gray-light);
    }
    
    .nav__link::after {
        display: none;
    }
    
    .nav__social-links {
        margin-left: 0;
        margin-top: 2rem;
        padding-left: 0;
        padding-top: 1.5rem;
        border-left: none;
        border-top: 1px solid var(--color-gray-light);
    }
    
    .nav__close {
        display: block;
        position: absolute;
        top: 1.5rem;
        right: 1.5rem;
    }
    
    .nav__toggle {
        display: block;
    }
    
    /* Portfolio Grid - 2 columns on tablet/large phone */
    .portfolio__grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.75rem;
    }
    
    .portfolio__filters {
        gap: 0.375rem;
        margin-bottom: 2rem;
    }
    
    .portfolio__filter {
        padding: 0.5rem 1rem;
        font-size: var(--fs-xs);
    }
    
    .portfolio__overlay {
        padding: 0.75rem 1rem;
    }
    
    .portfolio__category {
        font-size: var(--fs-xs);
    }
    
    /* Services Grid */
    .services__grid {
        grid-template-columns: 1fr;
        max-width: 400px;
        margin: 0 auto;
    }
    
    /* Footer */
    .footer__content {
        flex-direction: column;
        text-align: center;
        gap: 1.5rem;
    }
}

/* ==========================================
   RESPONSIVE DESIGN - MOBILE
   ========================================== */
@media screen and (max-width: 480px) {
    :root {
        --section-padding: 3rem;
        --container-padding: 1rem;
    }
    
    .hero__description {
        font-size: 1rem;
    }
    
    /* Portfolio - 2 columns on small phones, tighter gap */
    .portfolio__grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.5rem;
        max-width: 100%;
    }
    
    .portfolio__item {
        border-radius: var(--radius-sm);
    }
    
    .portfolio__filters {
        gap: 0.25rem;
        padding: 0 0.5rem;
    }
    
    .portfolio__filter {
        padding: 0.4rem 0.6rem;
        font-size: 0.65rem;
    }
    
    .portfolio__overlay {
        padding: 0.5rem 0.75rem;
    }
    
    .portfolio__category {
        font-size: 0.65rem;
    }
    
    .contact__form {
        padding: 1.5rem;
    }
    
    .btn {
        padding: 0.75rem 1.5rem;
    }
    
    .service__card {
        padding: 2rem 1.5rem;
    }
}

/* ==========================================
   RESPONSIVE DESIGN - VERY SMALL MOBILE
   ========================================== */
@media screen and (max-width: 360px) {
    .portfolio__filter {
        padding: 0.35rem 0.5rem;
        font-size: 0.6rem;
    }
    
    .nav__logo {
        font-size: 1.2rem;
    }
}

/* ==========================================
   ANIMATIONS
   ========================================== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.portfolio__item {
    animation: fadeIn 0.5s ease forwards;
}

.portfolio__item:nth-child(1) { animation-delay: 0.05s; }
.portfolio__item:nth-child(2) { animation-delay: 0.1s; }
.portfolio__item:nth-child(3) { animation-delay: 0.15s; }
.portfolio__item:nth-child(4) { animation-delay: 0.2s; }
.portfolio__item:nth-child(5) { animation-delay: 0.25s; }
.portfolio__item:nth-child(6) { animation-delay: 0.3s; }
.portfolio__item:nth-child(7) { animation-delay: 0.35s; }
.portfolio__item:nth-child(8) { animation-delay: 0.4s; }
.portfolio__item:nth-child(9) { animation-delay: 0.45s; }
.portfolio__item:nth-child(10) { animation-delay: 0.5s; }
.portfolio__item:nth-child(11) { animation-delay: 0.55s; }
.portfolio__item:nth-child(12) { animation-delay: 0.6s; }
.portfolio__item:nth-child(13) { animation-delay: 0.65s; }
.portfolio__item:nth-child(14) { animation-delay: 0.7s; }
.portfolio__item:nth-child(15) { animation-delay: 0.75s; }

/* ==========================================
   PLACEHOLDER STYLES (Remove after adding images)
   ========================================== */
.portfolio__image img[src=""],
.portfolio__image img:not([src]) {
    display: none;
}

.portfolio__image:has(img[src=""]),
.portfolio__image:has(img:not([src])) {
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-secondary) 100%);
    color: var(--color-white);
    font-size: var(--fs-small);
    letter-spacing: 0.1em;
}

/* Fallback for browsers that don't support :has() */
.portfolio__item[data-placeholder="true"] .portfolio__image {
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-secondary) 100%);
    color: var(--color-white);
    font-size: var(--fs-small);
    letter-spacing: 0.1em;
}

.portfolio__item[data-placeholder="true"] .portfolio__image::after {
    content: 'Add Image';
    text-transform: uppercase;
}

.portfolio__item[data-placeholder="true"] .portfolio__image img {
    display: none;
}