/* ========================================
   Invoicer Website - HIG-Inspired Styles
   ======================================== */

/* CSS Custom Properties (Design Tokens) */
:root {
    /* Colors - Light Mode */
    --color-bg: #ffffff;
    --color-bg-secondary: #f5f5f7;
    --color-bg-tertiary: #fbfbfd;
    --color-text: #1d1d1f;
    --color-text-secondary: #6e6e73;
    --color-text-tertiary: #86868b;
    --color-accent: #0071e3;
    --color-accent-hover: #0077ed;
    --color-border: rgba(0, 0, 0, 0.08);
    --color-shadow: rgba(0, 0, 0, 0.04);

    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Text', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    --font-size-hero: clamp(2.5rem, 5vw, 4rem);
    --font-size-h1: clamp(2rem, 4vw, 3rem);
    --font-size-h2: clamp(1.5rem, 3vw, 2rem);
    --font-size-h3: clamp(1.25rem, 2vw, 1.5rem);
    --font-size-body: 1.125rem;
    --font-size-small: 0.875rem;
    --font-weight-regular: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --line-height-tight: 1.1;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.7;

    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 2rem;
    --space-lg: 4rem;
    --space-xl: 6rem;
    --space-2xl: 8rem;

    /* Layout */
    --max-width: 1200px;
    --max-width-narrow: 800px;
    --border-radius: 12px;
    --border-radius-lg: 20px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
}

/* Dark Mode */
@media (prefers-color-scheme: dark) {
    :root {
        --color-bg: #000000;
        --color-bg-secondary: #1d1d1f;
        --color-bg-tertiary: #2d2d2f;
        --color-text: #f5f5f7;
        --color-text-secondary: #a1a1a6;
        --color-text-tertiary: #6e6e73;
        --color-border: rgba(255, 255, 255, 0.1);
        --color-shadow: rgba(0, 0, 0, 0.3);
    }
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-body);
    font-weight: var(--font-weight-regular);
    line-height: var(--line-height-normal);
    color: var(--color-text);
    background-color: var(--color-bg);
}

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

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

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

/* ========================================
   Typography
   ======================================== */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: var(--font-weight-semibold);
    line-height: var(--line-height-tight);
    letter-spacing: -0.02em;
}

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

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

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

.text-hero {
    font-size: var(--font-size-hero);
    font-weight: var(--font-weight-bold);
    letter-spacing: -0.03em;
}

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

.text-center {
    text-align: center;
}

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

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

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

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

/* ========================================
   Navigation
   ======================================== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid var(--color-border);
}

@media (prefers-color-scheme: dark) {
    .nav {
        background: rgba(29, 29, 31, 0.8);
    }
}

.nav__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 52px;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-md);
}

.nav__logo {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text);
}

.nav__logo img {
    width: 32px;
    height: 32px;
    border-radius: 8px;
}

.nav__links {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    list-style: none;
}

.nav__link {
    font-size: var(--font-size-small);
    color: var(--color-text);
    transition: color var(--transition-fast);
}

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

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

/* ========================================
   Buttons
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
    padding: 0.75rem 1.5rem;
    font-family: var(--font-family);
    font-size: var(--font-size-small);
    font-weight: var(--font-weight-medium);
    line-height: 1;
    border: none;
    border-radius: 980px;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn--primary {
    background: var(--color-accent);
    color: #ffffff;
}

.btn--primary:hover {
    background: var(--color-accent-hover);
    color: #ffffff;
    transform: scale(1.02);
}

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

.btn--secondary:hover {
    background: var(--color-bg-tertiary);
}

.btn--large {
    padding: 1rem 2rem;
    font-size: var(--font-size-body);
}

.btn--glass {
    background: rgba(0, 0, 0, 0.05);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(0, 0, 0, 0.1);
    color: var(--color-text);
    font-weight: var(--font-weight-semibold);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    min-width: 240px;
}

.btn--glass:hover {
    background: rgba(0, 0, 0, 0.1);
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
}

.btn--glass svg {
    width: 24px;
    height: 24px;
    margin-right: 8px;
    fill: currentColor;
}

@media (prefers-color-scheme: dark) {
    .btn--glass {
        background: rgba(255, 255, 255, 0.1);
        border: 1px solid rgba(255, 255, 255, 0.1);
        color: #ffffff;
        box-shadow: 0 4px 24px rgba(0, 0, 0, 0.2);
    }

    .btn--glass:hover {
        background: rgba(255, 255, 255, 0.15);
    }
}

/* App Store Badge */
.app-store-badge {
    display: inline-block;
    transition: transform var(--transition-fast);
}

.app-store-badge:hover {
    transform: scale(1.05);
}

.app-store-badge img {
    height: 52px;
    width: auto;
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
    padding-top: calc(52px + var(--space-2xl));
    text-align: center;
}

.hero__title {
    margin-bottom: var(--space-sm);
}

.hero__subtitle {
    max-width: 600px;
    margin: 0 auto var(--space-lg);
    font-size: 1.25rem;
    color: var(--color-text-secondary);
}

.hero__actions {
    display: flex;
    justify-content: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-xl);
    flex-wrap: wrap;
}

.hero__image {
    max-width: 100%;
    margin: 0 auto;
    border-radius: var(--border-radius-lg);
    box-shadow:
        0 2px 40px var(--color-shadow),
        0 0 0 1px var(--color-border);
}

.hero__image-container {
    position: relative;
    padding: 40px;
    background: linear-gradient(135deg, #FF9A9E 0%, #FECFEF 20%, #E0C3FC 40%, #D4FC79 60%, #96E6A1 80%, #4FACFE 100%);
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
    overflow: hidden;
}

/* Abstract macOS-like mesh gradient overlay */
.hero__image-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 10% 10%, rgba(255, 255, 255, 0.4) 0%, transparent 50%),
        radial-gradient(circle at 90% 90%, rgba(255, 255, 255, 0.4) 0%, transparent 50%);
    pointer-events: none;
}

@media (prefers-color-scheme: dark) {
    .hero__image-container {
        background: linear-gradient(135deg, #1A1A40 0%, #270082 30%, #7A0BC0 60%, #FA58B6 100%);
        box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
    }
}

/* ========================================
   Features Section
   ======================================== */
.features {
    background: var(--color-bg-secondary);
}

.features__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-md);
}

.feature-card {
    padding: var(--space-lg);
    background: var(--color-bg);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--color-border);
    text-align: center;
}

.feature-card__icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    margin: 0 auto var(--space-sm);
    background: var(--color-bg-secondary);
    border-radius: var(--border-radius);
    font-size: 1.5rem;
}

.feature-card__title {
    margin-bottom: var(--space-xs);
}

.feature-card__description {
    color: var(--color-text-secondary);
    font-size: var(--font-size-small);
}

/* ========================================
   Screenshots Section
   ======================================== */
.screenshots__title {
    text-align: center;
    margin-bottom: var(--space-lg);
}

.screenshots__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-md);
}

.screenshots__grid img {
    border-radius: var(--border-radius);
    box-shadow: 0 4px 24px var(--color-shadow);
    border: 1px solid var(--color-border);
}

/* ========================================
   Footer
   ======================================== */
.footer {
    padding: var(--space-lg) 0;
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
}

.footer__inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
    text-align: center;
}

.footer__links {
    display: flex;
    gap: var(--space-md);
    list-style: none;
}

.footer__link {
    font-size: var(--font-size-small);
    color: var(--color-text-secondary);
}

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

.footer__copyright {
    font-size: var(--font-size-small);
    color: var(--color-text-tertiary);
}

/* ========================================
   Forms (Contact Page)
   ======================================== */
.form {
    max-width: 600px;
    margin: 0 auto;
}

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

.form__label {
    display: block;
    margin-bottom: var(--space-xs);
    font-size: var(--font-size-small);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-secondary);
}

.form__input,
.form__select,
.form__textarea {
    width: 100%;
    padding: 0.875rem 1rem;
    font-family: var(--font-family);
    font-size: var(--font-size-body);
    color: var(--color-text);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form__input:focus,
.form__select:focus,
.form__textarea:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(0, 113, 227, 0.15);
}

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

.form__submit {
    width: 100%;
}

/* ========================================
   Content Pages (Privacy)
   ======================================== */
.content {
    padding-top: calc(52px + var(--space-lg));
}

.content__header {
    text-align: center;
    margin-bottom: var(--space-lg);
}

.content__body {
    max-width: var(--max-width-narrow);
    margin: 0 auto;
}

.content__body h2 {
    margin-top: var(--space-lg);
    margin-bottom: var(--space-sm);
}

.content__body p {
    margin-bottom: var(--space-sm);
    color: var(--color-text-secondary);
}

.content__body ul {
    margin-bottom: var(--space-sm);
    padding-left: var(--space-md);
    color: var(--color-text-secondary);
}

.content__body li {
    margin-bottom: var(--space-xs);
}

/* ========================================
   Utilities
   ======================================== */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

/* ========================================
   Responsive
   ======================================== */
@media (max-width: 768px) {
    .nav__links {
        display: none;
    }

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

    .footer__inner {
        gap: var(--space-md);
    }

    .footer__links {
        flex-direction: column;
        gap: var(--space-xs);
    }
}

/* ========================================
   Text Utilities
   ======================================== */
.text-serif {
    font-family: 'New York', 'Times New Roman', Times, serif;
    font-style: italic;
    font-weight: 500;
}

/* ========================================
   Lightbox
   ======================================== */
.lightbox {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1000;
    background: rgba(0, 0, 0, 0.9);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-normal);
}

.lightbox.active {
    opacity: 1;
    pointer-events: auto;
}

.lightbox__content {
    position: relative;
    max-width: 90vw;
    max-height: 90vh;
    transform: scale(0.95);
    transition: transform var(--transition-normal);
}

.lightbox.active .lightbox__content {
    transform: scale(1);
}

.lightbox__image {
    max-width: 100%;
    max-height: 90vh;
    border-radius: 8px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.lightbox__close {
    position: absolute;
    top: 20px;
    right: 20px;
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: white;
    font-size: 2rem;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background var(--transition-fast);
    z-index: 1001;
}

.lightbox__close:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* Make gallery images look clickable */
.screenshots__grid img {
    cursor: zoom-in;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.screenshots__grid img:hover {
    transform: scale(1.02);
    box-shadow: 0 8px 30px var(--color-shadow);
}