/* ===================================
   Daniel Stone - Personal Website
   Clean recreation of Squarespace design
   Version 2.0 - Optimized & Accessible
   =================================== */

/* ===================================
   CSS Custom Properties (Design Tokens)
   =================================== */

:root {
    /* Colors */
    --color-white: #ffffff;
    --color-black: #000000;
    --color-accent: #52AEDD;
    --color-light-accent: #F0F7FB;
    --color-dark-accent: #1A3D4F;
    --color-diffusion-dark: #1e3a8a;
    --color-gray-light: #f0f0f0;

    /* Typography */
    --font-primary: 'neue-haas-grotesk-display', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    --font-fallback: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;

    /* Font Sizes */
    --font-size-base: 16px;
    --font-size-small: 0.875rem;
    --font-size-large: 1.125rem;

    /* Spacing */
    --spacing-page-padding: clamp(1.5rem, 4vw, 4rem);
    --spacing-section: clamp(3rem, 8vw, 8rem);
    --spacing-section-small: clamp(2rem, 6vw, 6rem);
    --spacing-content: 1.5rem;

    /* Layout */
    --max-width-full: 1800px;
    --max-width-wide: 1600px;
    --max-width-medium: 1400px;
    --max-width-narrow: 800px;

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-medium: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* Shadows */
    --shadow-small: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 4px 16px rgba(0, 0, 0, 0.15);
    --shadow-large: 0 10px 25px rgba(0, 0, 0, 0.2);

    /* Z-index */
    --z-header: 1000;
    --z-skip-link: 1001;
}

/* ===================================
   Reset & Base Styles
   =================================== */

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

html {
    scroll-behavior: smooth;
}

/* Respect user's motion preferences */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

body {
    font-family: var(--font-primary), var(--font-fallback);
    color: var(--color-black);
    background-color: var(--color-white);
    line-height: 1.6;
    font-size: var(--font-size-base);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===================================
   Scroll Progress Indicator
   =================================== */

.scroll-progress {
    display: none;
}

/* ===================================
   Skip Link (Accessibility)
   =================================== */

.skip-link {
    position: absolute;
    top: -100px;
    left: 0;
    background: var(--color-accent);
    color: var(--color-white);
    padding: 1rem 1.5rem;
    text-decoration: none;
    font-weight: 600;
    z-index: var(--z-skip-link);
    transition: top var(--transition-fast);
}

.skip-link:focus {
    top: 0;
}

/* ===================================
   Typography
   =================================== */

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
}

h1 {
    font-size: clamp(2.5rem, 6vw, 5rem);
}

h2 {
    font-size: clamp(1.75rem, 3.5vw, 2.5rem);
    font-weight: 600;
}

p {
    margin-bottom: 1rem;
}

p.lead {
    font-size: clamp(1.125rem, 1.5vw, 1.25rem);
    line-height: 1.5;
}

strong {
    font-weight: 600;
}

em {
    font-style: italic;
}

/* ===================================
   Links & Focus States
   =================================== */

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

a:hover {
    opacity: 0.7;
}

/* Enhanced link underlines for content links */
.about-content a,
.contact-form-intro a {
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 2px;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    display: inline;
    word-wrap: break-word;
    overflow-wrap: break-word;
    hyphens: manual;
}

.about-content a:hover,
.contact-form-intro a:hover {
    text-underline-offset: 4px;
    text-decoration-thickness: 2px;
    transform: translateY(-1px) scale(1.01);
    opacity: 1;
}

.about-content a:active,
.contact-form-intro a:active {
    transform: translateY(0) scale(1);
    text-underline-offset: 2px;
}

/* Enhanced focus styles for accessibility */
a:focus,
button:focus,
input:focus,
textarea:focus {
    outline: 3px solid var(--color-accent);
    outline-offset: 2px;
}

/* Only show focus ring for keyboard navigation */
a:focus:not(.keyboard-focus),
button:focus:not(.keyboard-focus),
input:focus:not(.keyboard-focus),
textarea:focus:not(.keyboard-focus) {
    outline: none;
}

a.keyboard-focus,
button.keyboard-focus {
    outline: 3px solid var(--color-accent);
    outline-offset: 2px;
}

/* ===================================
   Images
   =================================== */

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

/* Prevent layout shift while images load */
img[width][height] {
    aspect-ratio: attr(width) / attr(height);
}

/* ===================================
   Layout Containers
   =================================== */

.container {
    max-width: var(--max-width-full);
    margin: 0 auto;
    padding: 0 var(--spacing-page-padding);
}

.container-medium {
    max-width: var(--max-width-medium);
    margin: 0 auto;
    padding: 0 var(--spacing-page-padding);
}

.container-wide {
    max-width: var(--max-width-wide);
    margin: 0 auto;
    padding: 0 var(--spacing-page-padding);
}

.container-narrow {
    max-width: var(--max-width-narrow);
    margin: 0 auto;
    padding: 0 var(--spacing-page-padding);
}

/* ===================================
   Header
   =================================== */

.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: var(--color-accent);
    z-index: var(--z-header);
    padding: clamp(1.5rem, 3vw, 3rem) var(--spacing-page-padding);
}

.header-content {
    max-width: var(--max-width-full);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-content::before {
    content: 'Daniel Stone';
    color: var(--color-white);
    font-size: 1.25rem;
    font-weight: 600;
    background: linear-gradient(
        120deg,
        var(--color-white) 0%,
        var(--color-white) 40%,
        rgba(255, 255, 255, 0.8) 50%,
        var(--color-white) 60%,
        var(--color-white) 100%
    );
    background-size: 200% 100%;
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    cursor: pointer;
    background-position: 0% 0%;
    transition: background-position 0.6s ease-in-out;
}

.header:hover .header-content::before {
    animation: shimmer 1.2s ease-in-out;
}

@keyframes shimmer {
    0% {
        background-position: 0% 0%;
    }
    50% {
        background-position: 100% 0%;
    }
    100% {
        background-position: 0% 0%;
    }
}

@media (prefers-reduced-motion: reduce) {
    .header-content::before {
        animation: none;
        -webkit-text-fill-color: var(--color-white);
    }

    .header:hover .header-content::before {
        animation: none;
    }
}

.nav {
    display: flex;
    gap: clamp(1rem, 3vw, 2rem);
    align-items: center;
}

.nav a {
    font-size: 1rem;
    font-weight: 500;
    letter-spacing: 0.02em;
    color: var(--color-white);
    padding: 0.5rem;
    min-height: 44px; /* Touch target size */
    display: inline-flex;
    align-items: center;
}

.nav a:hover {
    opacity: 0.8;
}

/* Mobile Navigation */
@media (max-width: 640px) {
    .header-content::before {
        font-size: 1rem;
    }

    .nav {
        gap: 0.75rem;
    }

    .nav a {
        font-size: 0.875rem;
    }
}

/* ===================================
   Hero Section
   =================================== */

.hero-section {
    padding: calc(125px + 4vw) var(--spacing-page-padding) var(--spacing-section);
    min-height: 90vh;
    display: flex;
    align-items: center;
    background-color: var(--color-accent);
}

.hero-section h1 {
    color: var(--color-white);
    font-size: clamp(2.5rem, 7vw, 5.6rem);
    font-weight: 700;
}

/* Viewport-based animations - only when .animate-in class is added */
.hero-section h1 {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
    /* Fallback: show text after 2s even if JS fails */
    animation: fallback-fadein 0.5s ease 2s forwards;
}

@keyframes fallback-fadein {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-section h1.animate-in {
    opacity: 1;
    transform: translateY(0);
    animation: none; /* Override fallback when JS works */
}

.hero-section .hero-line-1 {
    display: block;
    transition-delay: 0.1s;
}

.hero-section .hero-line-2 {
    display: block;
    transition-delay: 0.3s;
}

.cta-button {
    display: inline-block;
    margin-top: 3rem;
    padding: 1.2rem 2.5rem;
    min-height: 44px; /* Touch target */
    background-color: var(--color-white);
    color: var(--color-accent);
    font-size: 1.1rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: 4px;
    transition: background-color 0.2s ease, color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
    opacity: 0;
    transform: translateY(30px);
    /* Fallback: show button after 2.5s even if JS fails */
    animation: fallback-fadein 0.5s ease 2.5s forwards;
}

.cta-button.animate-in {
    opacity: 1;
    transform: translateY(0);
    animation: none; /* Override fallback when JS works */
    transition: opacity 0.8s ease 0.5s, transform 0.8s ease 0.5s, background-color 0.2s ease, color 0.2s ease;
}

.cta-button:hover,
.cta-button:focus {
    background-color: var(--color-black);
    color: var(--color-white);
    transform: translateY(-2px);
    box-shadow: var(--shadow-large);
}

/* Magnetic cursor effect will be applied via JavaScript */
@media (hover: hover) and (pointer: fine) {
    .cta-button,
    .diffusion-button,
    .submit-button {
        position: relative;
    }
}

/* ===================================
   About Section
   =================================== */

.about-section {
    padding: calc(1vmax / 10) var(--spacing-page-padding) var(--spacing-section);
    background-color: var(--color-accent);
}

.about-section,
.about-section p,
.about-section strong {
    color: var(--color-white);
}

.about-section a {
    color: var(--color-white);
    text-decoration: underline;
}

.about-grid {
    display: grid;
    grid-template-columns: minmax(50px, 2fr) minmax(30px, 1fr) minmax(80px, 2fr) minmax(200px, 7fr);
    gap: clamp(0.5rem, 2vw, 2rem);
    align-items: start;
}

.about-content {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.about-content.animate-in {
    opacity: 1;
    transform: translateY(0);
}

.about-sidebar .divider {
    border: none;
    border-top: 1px solid var(--color-white);
    margin: 0;
}

.about-greeting p {
    font-weight: 600;
}

.about-content p {
    margin-bottom: 1.5rem;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

/* Mobile About Section */
@media (max-width: 768px) {
    .about-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .about-sidebar,
    .about-spacer {
        display: none;
    }
}

/* ===================================
   Spacer Section
   =================================== */

.spacer-section {
    min-height: 0;
    background-color: var(--color-accent);
    padding: 0;
    margin: 0;
}

/* ===================================
   Diffusion Section
   =================================== */

.diffusion-section {
    /* WebP with JPEG fallback */
    background-image: url('Additional/Half-blue.webp');
    background-image: -webkit-image-set(
        url('Additional/Half-blue.webp') 1x,
        url('Additional/Half-blue.jpg') 1x
    );
    background-image: image-set(
        url('Additional/Half-blue.webp') type('image/webp'),
        url('Additional/Half-blue.jpg') type('image/jpeg')
    );
    background-size: cover;
    background-position: left center;
    background-repeat: no-repeat;
    background-color: var(--color-diffusion-dark); /* Fallback color */
    padding: var(--spacing-section) var(--spacing-page-padding);
    position: relative;
    overflow: hidden;
}

.diffusion-container {
    max-width: var(--max-width-full);
    margin: 0 auto;
    position: relative;
    z-index: 2;
}

.diffusion-content {
    max-width: 600px;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.diffusion-content.animate-in {
    opacity: 1;
    transform: translateY(0);
}

.diffusion-logo {
    width: min(280px, 100%);
    height: auto;
    margin-bottom: 2rem;
    display: block;
}

.diffusion-section p {
    font-size: clamp(1.2rem, 2vw, 1.5rem);
    line-height: 1.4;
    margin-bottom: 2.5rem;
    color: var(--color-white);
    font-weight: 500;
}

.diffusion-button {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.9rem 1.8rem;
    min-height: 44px; /* Touch target */
    background-color: var(--color-white);
    color: var(--color-diffusion-dark);
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: 4px;
    transition: all var(--transition-fast);
}

.button-arrow {
    width: 16px;
    height: auto;
    flex-shrink: 0;
    transition: transform var(--transition-fast);
}

.diffusion-button:hover,
.diffusion-button:focus {
    background-color: var(--color-gray-light);
}

.diffusion-button:hover .button-arrow {
    transform: translateX(4px);
}

/* ===================================
   Contact Section
   =================================== */

.contact-section {
    padding: var(--spacing-section) var(--spacing-page-padding);
    background-color: var(--color-white);
}

.contact-grid {
    display: grid;
    grid-template-columns: minmax(200px, 5fr) minmax(30px, 1fr) minmax(250px, 6fr);
    gap: clamp(1rem, 3vw, 3rem);
    align-items: start;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.contact-grid.animate-in {
    opacity: 1;
    transform: translateY(0);
}

.contact-left h2 {
    margin-bottom: 2rem;
}

.contact-image {
    margin-top: 2rem;
    overflow: hidden;
    border-radius: 4px;
}

.contact-image img {
    width: 100%;
    height: auto;
    aspect-ratio: 1/1;
    object-fit: cover;
    transition: transform 0.1s ease-out;
    will-change: transform;
}

/* Parallax effect will be applied via JavaScript */
@media (prefers-reduced-motion: reduce) {
    .contact-image img {
        transform: none !important;
    }
}

.contact-form-intro {
    margin-bottom: 2rem;
}

/* ===================================
   Form Styles
   =================================== */

.contact-form {
    width: 100%;
}

.form-group {
    margin-bottom: var(--spacing-content);
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: var(--font-size-small);
    font-weight: 500;
}

.form-group .required {
    font-weight: 400;
    opacity: 0.6;
    margin-left: 0.25rem;
}

.name-fields {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
}

.field-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    opacity: 0.7;
    margin-bottom: 0.25rem;
}

input[type="text"],
input[type="email"],
textarea {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--color-black);
    background-color: var(--color-white);
    font-family: var(--font-primary), var(--font-fallback);
    font-size: 1rem;
    transition: border-color var(--transition-fast);
    border-radius: 2px;
}

input[type="text"]:hover,
input[type="email"]:hover,
textarea:hover {
    border-color: var(--color-dark-accent);
}

input[type="text"]:focus,
input[type="email"]:focus,
textarea:focus {
    outline: none;
    border-color: var(--color-accent);
}

textarea {
    resize: vertical;
    min-height: 120px;
}

/* Validation - Invalid State */
input.invalid,
textarea.invalid {
    border-color: #dc3545;
    background-color: #fff5f5;
}

input.invalid:focus,
textarea.invalid:focus {
    outline-color: #dc3545;
    border-color: #dc3545;
}

/* Error Messages */
.error-message {
    display: none;
    color: #dc3545;
    font-size: 0.875rem;
    margin-top: 0.25rem;
    font-weight: 500;
}

.error-message:not(:empty) {
    display: block;
}

/* Form Status Messages */
.form-status {
    margin-bottom: 1rem;
    padding: 1rem;
    border-radius: 4px;
    display: none;
}

.form-status-loading,
.form-status-success,
.form-status-error {
    display: block;
}

.form-status-success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.form-status-error {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.form-status-loading {
    background-color: #d1ecf1;
    color: #0c5460;
    border: 1px solid #bee5eb;
}

.form-button-wrapper {
    text-align: left;
}

.submit-button {
    background-color: var(--color-dark-accent);
    color: var(--color-white);
    border: none;
    padding: 1rem 2rem;
    min-height: 44px; /* Touch target */
    font-family: var(--font-primary), var(--font-fallback);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color var(--transition-fast);
    border-radius: 4px;
    position: relative;
}

.submit-button:hover,
.submit-button:focus {
    background-color: var(--color-black);
}

.submit-button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Loading state */
.submit-button .button-loading {
    display: none;
}

.submit-button.loading .button-text {
    display: none;
}

.submit-button.loading .button-loading {
    display: inline;
}

/* Mobile Contact Grid */
@media (max-width: 768px) {
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .contact-spacer {
        display: none;
    }
}

/* ===================================
   Badge Section
   =================================== */

.badge-section {
    min-height: 10vh;
    padding: calc(10vmax / 10) var(--spacing-page-padding);
    background-color: var(--color-white);
    display: flex;
    align-items: center;
    justify-content: center;
}

.badge-section img {
    margin: 0 auto;
}

/* ===================================
   Footer
   =================================== */

.footer {
    min-height: 10vh;
    padding: calc(10vmax / 10) var(--spacing-page-padding);
    background-color: var(--color-white);
}

.footer-content {
    text-align: center;
    font-size: var(--font-size-small);
    color: var(--color-dark-accent);
}

.footer-content p {
    margin: 0;
}

/* ===================================
   Print Styles
   =================================== */

@media print {
    .header,
    .skip-link,
    .badge-section {
        display: none;
    }

    .hero-section,
    .about-section,
    .diffusion-section {
        background: white;
        color: black;
    }

    a {
        text-decoration: underline;
    }

    a[href^="http"]:after {
        content: " (" attr(href) ")";
    }
}

/* ===================================
   High Contrast Mode Support
   =================================== */

@media (prefers-contrast: high) {
    input[type="text"],
    input[type="email"],
    textarea {
        border-width: 3px;
    }

    a:focus,
    button:focus {
        outline-width: 4px;
    }
}