/* ========================================
   COLDENERGY - MAIN STYLESHEET
   Modern B2B Industrial AC & Power Systems
   ======================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Roboto+Mono:wght@400;500&display=swap');
@import './variables.css';

/* ===== RESET & BASE STYLES ===== */

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-regular);
  line-height: var(--line-height-normal);
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

/* ===== UTILITY CLASSES ===== */

.container {
  width: 100%;
  max-width: var(--container-xl);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

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

@media (min-width: 1024px) {
  .section {
    padding: var(--section-padding-desktop) 0;
  }
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

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

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background-color: rgba(15, 15, 15, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  z-index: var(--z-sticky);
  transition: background-color var(--transition-base);
}

.header--scrolled {
  background-color: rgba(15, 15, 15, 0.98);
  box-shadow: var(--shadow-md);
}

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

.header__logo {
  height: 50px;
  transition: transform var(--transition-fast);
}

.header__logo:hover {
  transform: scale(1.05);
}

.header__logo img {
  height: 100%;
  width: auto;
  object-fit: contain;
}

/* Logo optimized for dark theme via SVG (cold_energy_logo_light.svg) */

/* ===== NAVIGATION ===== */

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 6px;
  padding: var(--space-sm);
  z-index: var(--z-modal);
}

.nav__toggle-line {
  width: 28px;
  height: 2px;
  background-color: var(--color-text-primary);
  transition: all var(--transition-base);
}

.nav__toggle--active .nav__toggle-line:nth-child(1) {
  transform: rotate(45deg) translate(8px, 8px);
}

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

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

.nav__list {
  display: flex;
  gap: var(--space-2xl);
  list-style: none;
  align-items: center;
}

.nav__link {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  position: relative;
  padding: var(--space-sm) 0;
  transition: color var(--transition-fast);
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-accent-primary), var(--color-accent-secondary));
  transition: width var(--transition-base);
}

.nav__link:hover,
.nav__link--active {
  color: var(--color-text-primary);
}

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

/* Mobile Navigation */
@media (max-width: 1023px) {
  .nav__toggle {
    display: flex;
  }

  .nav__list {
    position: fixed;
    top: 0;
    right: -100%;
    height: 100vh;
    width: 280px;
    flex-direction: column;
    gap: var(--space-xl);
    background-color: var(--color-bg-secondary);
    padding: calc(var(--header-height) + var(--space-xl)) var(--space-xl);
    border-left: 1px solid var(--color-border);
    transition: right var(--transition-base);
    align-items: flex-start;
  }

  .nav__list--active {
    right: 0;
  }

  .nav__link {
    font-size: var(--font-size-lg);
  }
}

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

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  padding-top: var(--header-height);
  background: linear-gradient(135deg, var(--color-bg-primary) 0%, var(--color-bg-secondary) 100%);
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, var(--color-accent-glow) 0%, transparent 70%);
  opacity: 0.3;
  pointer-events: none;
}

.hero__container {
  position: relative;
  z-index: var(--z-base);
  text-align: center;
}

.hero__title {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  margin-bottom: var(--space-lg);
  background: linear-gradient(135deg, var(--color-text-primary), var(--color-accent-primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__subtitle {
  font-size: var(--font-size-xl);
  color: var(--color-text-secondary);
  max-width: 700px;
  margin: 0 auto var(--space-2xl);
  line-height: var(--line-height-relaxed);
}

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

@media (min-width: 768px) {
  .hero__title {
    font-size: var(--font-size-6xl);
  }
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-2xl);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  white-space: nowrap;
}

.btn--primary {
  background: linear-gradient(135deg, var(--color-accent-primary), var(--color-accent-secondary));
  color: var(--color-bg-primary);
  box-shadow: var(--shadow-glow);
}

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

.btn--secondary {
  background-color: transparent;
  border: 2px solid var(--color-accent-primary);
  color: var(--color-accent-primary);
}

.btn--secondary:hover {
  background-color: var(--color-accent-primary);
  color: var(--color-bg-primary);
  transform: translateY(-2px);
}

/* ===== SECTION HEADERS ===== */

.section__header {
  text-align: center;
  margin-bottom: var(--space-4xl);
}

.section__title {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--space-md);
  position: relative;
  display: inline-block;
}

.section__title::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent-primary), var(--color-accent-secondary));
}

.section__subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: var(--space-xl) auto 0;
}

/* ===== ABOUT SECTION ===== */

.about {
  background-color: var(--color-bg-secondary);
}

/* Owners Grid */
.owners {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3xl);
  margin-bottom: var(--space-4xl);
}

@media (min-width: 1024px) {
  .owners {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Individual Owner Card */
.owner-card {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: all var(--transition-base);
}

.owner-card:hover {
  border-color: var(--color-accent-primary);
  transform: translateY(-5px);
  box-shadow: var(--shadow-xl);
}

.owner-card__image-wrapper {
  position: relative;
  width: 100%;
  height: 350px;
  overflow: hidden;
  background-color: var(--color-bg-tertiary);
}

.owner-card__image-wrapper::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 0%, rgba(0, 212, 255, 0.1) 100%);
  z-index: var(--z-base);
}

.owner-card__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.owner-card:hover .owner-card__image {
  transform: scale(1.05);
}

.owner-card__content {
  padding: var(--space-2xl);
}

.owner-card__name {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--space-sm);
  background: linear-gradient(135deg, var(--color-text-primary), var(--color-accent-primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.owner-card__title {
  font-size: var(--font-size-base);
  color: var(--color-accent-primary);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-lg);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.owner-card__description {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--space-md);
}

.owner-card__description:last-child {
  margin-bottom: 0;
}

/* Company Info Section */
.about__company-info {
  max-width: 900px;
  margin: 0 auto;
  text-align: center;
  padding: var(--space-3xl);
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
}

.about__company-info p {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--space-lg);
}

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

.about__company-info strong {
  color: var(--color-text-primary);
}

/* ===== SERVICES SECTION ===== */

.services__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
}

@media (min-width: 640px) {
  .services__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .services__grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.service-card {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent-primary), var(--color-accent-secondary));
  transform: scaleX(0);
  transition: transform var(--transition-base);
}

.service-card:hover {
  border-color: var(--color-accent-primary);
  transform: translateY(-5px);
  box-shadow: var(--shadow-glow);
}

.service-card:hover::before {
  transform: scaleX(1);
}

.service-card__icon {
  font-size: var(--font-size-4xl);
  margin-bottom: var(--space-lg);
  color: var(--color-accent-primary);
}

.service-card__title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--space-md);
}

.service-card__description {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
}

/* ===== PROJECTS SECTION ===== */

.projects {
  background-color: var(--color-bg-secondary);
}

.projects__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2xl);
}

@media (min-width: 768px) {
  .projects__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .projects__grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.project-card {
  background-color: var(--color-bg-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  transition: all var(--transition-base);
}

.project-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-xl);
  border-color: var(--color-accent-primary);
}

.project-card__image-wrapper {
  position: relative;
  height: 250px;
  overflow: hidden;
  background-color: var(--color-bg-tertiary);
}

.project-card__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.project-card:hover .project-card__image {
  transform: scale(1.1);
}

.project-card__content {
  padding: var(--space-xl);
}

.project-card__title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--space-md);
}

.project-card__description {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--space-md);
}

.project-card__tag {
  display: inline-block;
  padding: var(--space-xs) var(--space-md);
  background-color: rgba(0, 212, 255, 0.1);
  color: var(--color-accent-primary);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  margin-right: var(--space-sm);
  margin-top: var(--space-sm);
}

/* ===== TESTIMONIALS SECTION ===== */

.testimonials__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
}

@media (min-width: 768px) {
  .testimonials__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .testimonials__grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.testimonial-card {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  position: relative;
}

.testimonial-card::before {
  content: '\201C';
  position: absolute;
  top: var(--space-lg);
  left: var(--space-lg);
  font-size: var(--font-size-6xl);
  color: var(--color-accent-primary);
  opacity: 0.2;
  line-height: 1;
}

.testimonial-card__quote {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--space-xl);
  position: relative;
  z-index: var(--z-base);
}

.testimonial-card__author {
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-xs);
}

.testimonial-card__company {
  font-size: var(--font-size-sm);
  color: var(--color-accent-primary);
}

/* ===== CONTACT SECTION ===== */

.contact {
  background-color: var(--color-bg-secondary);
}

.contact__container {
  max-width: var(--container-md);
}

.contact__form {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-3xl);
}

.form__group {
  margin-bottom: var(--space-xl);
}

.form__label {
  display: block;
  font-weight: var(--font-weight-medium);
  margin-bottom: var(--space-sm);
  color: var(--color-text-primary);
}

.form__input,
.form__textarea {
  width: 100%;
  padding: var(--space-md);
  background-color: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  font-size: var(--font-size-base);
  font-family: inherit;
  transition: all var(--transition-fast);
}

.form__input:focus,
.form__textarea:focus {
  outline: none;
  border-color: var(--color-accent-primary);
  box-shadow: 0 0 0 3px var(--color-accent-glow);
}

.form__textarea {
  min-height: 150px;
  resize: vertical;
}

.form__button {
  width: 100%;
}

.contact__info {
  margin-top: var(--space-3xl);
  text-align: center;
}

.contact__phone {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-accent-primary);
  margin-top: var(--space-lg);
}

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

.footer {
  background-color: var(--color-bg-primary);
  border-top: 1px solid var(--color-border);
  padding: var(--space-3xl) 0 var(--space-xl);
}

.footer__container {
  text-align: center;
}

.footer__logo {
  height: 60px;
  margin: 0 auto var(--space-xl);
}

.footer__logo img {
  height: 100%;
  width: auto;
  object-fit: contain;
}

.footer__text {
  color: var(--color-text-tertiary);
  font-size: var(--font-size-sm);
}

.footer__text a {
  color: var(--color-accent-primary);
  font-weight: var(--font-weight-medium);
}

.footer__text a:hover {
  text-decoration: underline;
}

/* ===== ANIMATIONS ===== */

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in-up {
  animation: fadeInUp 0.6s ease-out forwards;
}

/* ===== SCROLL ANIMATIONS ===== */

.reveal {
  opacity: 0;
  transform: translateY(50px);
  transition: all 0.6s ease-out;
}

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