/**
 * MURMURATION PORTFOLIO - Global Styles
 * =====================================
 * Design Philosophy: Ethereal, living-system aesthetic.
 * Every interaction feels like stirring water or disturbing a flock.
 */

/* ===========================================
   CSS VARIABLES
   =========================================== */
:root {
    /* Colors */
    --color-text: #e0e1dd;
    --color-text-muted: rgba(224, 225, 221, 0.7);
    --color-text-subtle: rgba(224, 225, 221, 0.6);
    --color-text-faint: rgba(224, 225, 221, 0.3);
    --color-bg: #000000;
    --color-accent: #9a94bc;

    /* Project background colors */
    --color-project-1: #1a2f23; /* Dark forest green */
    --color-project-2: #2f1f24; /* Dark burgundy/wine */
    --color-project-3: #1f1f2f; /* Deep navy/indigo */
    --color-project-4: #262422; /* Warm charcoal */
    --color-project-5: #2a2a1f; /* Dark olive/earthy */
    --color-project-6: #291f2f; /* Midnight plum */
    --color-contact: #0f0f0f;   /* Near-black */

    /* Easing curves - organic, never mechanical */
    --ease-organic: cubic-bezier(0.16, 1, 0.3, 1);      /* Expo out - starts fast, decelerates */
    --ease-settle: cubic-bezier(0.34, 1.56, 0.64, 1);   /* Slight overshoot then settle */
    --ease-gentle: cubic-bezier(0.33, 1, 0.68, 1);      /* Like focusing eyes */

    /* Timing */
    --transition-slow: 800ms;
    --transition-medium: 400ms;
    --transition-fast: 300ms;

    /* Typography */
    --font-main: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;

    /* Spacing */
    --nav-padding: 40px;
    --content-padding: 60px;
}

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

html {
    scroll-behavior: smooth;
}

html, body {
    min-height: 100dvh; /* Dynamic viewport height - prevents mobile browser chrome issues */
    overflow-x: hidden;
}

body {
    font-family: var(--font-main);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
}

/* Page transition overlay */
.page-transition-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--color-bg);
    z-index: 9999;
    pointer-events: none;
    opacity: 0;
    transition: opacity var(--transition-medium) var(--ease-organic);
}

.page-transition-overlay.active {
    opacity: 1;
    pointer-events: all;
}

/* Page entrance animation */
.page-content {
    animation: pageEnter var(--transition-slow) var(--ease-gentle) forwards;
}

@keyframes pageEnter {
    from {
        filter: blur(20px);
        opacity: 0;
    }
    to {
        filter: blur(0);
        opacity: 1;
    }
}

/* ===========================================
   NAVIGATION - Main Nav Container
   =========================================== */
.main-nav,
.nav {
    position: fixed;
    top: 60px;
    right: 60px;
    z-index: 100;
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-home {
    position: fixed;
    top: var(--nav-padding);
    left: var(--nav-padding);
    z-index: 100;
}

/* Home button - geometric circle that pulses */
.nav-home-link {
    display: block;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--color-text);
    opacity: 0.5;
    transition:
        opacity var(--transition-medium) var(--ease-organic),
        transform var(--transition-medium) var(--ease-settle);
}

.nav-home-link:hover {
    opacity: 1;
    transform: scale(1.3);
}

/* Navigation items */
.nav-item {
    position: relative;
}

/* ===========================================
   PROJECTS TRIGGER BUTTON
   =========================================== */
.projects-trigger {
    /* Text styling */
    font-family: var(--font-main);
    font-size: 0.85rem;
    font-weight: 300;
    letter-spacing: 0.25em;
    text-transform: uppercase;
    color: var(--color-text);
    text-decoration: none;
    opacity: 0.7;
    cursor: pointer;

    /* Background - subtle, ethereal */
    background: rgba(224, 225, 221, 0.05);
    border: 1px solid rgba(224, 225, 221, 0.2);
    padding: 12px 24px;

    /* Transitions */
    transition:
        opacity 400ms var(--ease-organic),
        background 400ms var(--ease-organic),
        border-color 400ms var(--ease-organic),
        letter-spacing 400ms var(--ease-organic),
        color 400ms var(--ease-organic);
}

.projects-trigger:hover,
.projects-trigger:focus {
    opacity: 1;
    background: rgba(224, 225, 221, 0.1);
    border-color: rgba(224, 225, 221, 0.4);
    letter-spacing: 0.35em;
    color: #ffffff;
}

/* ===========================================
   CONTACT LINK
   =========================================== */
.contact-link {
    font-family: var(--font-main);
    font-size: 0.85rem;
    font-weight: 300;
    letter-spacing: 0.25em;
    text-transform: uppercase;
    color: var(--color-text);
    text-decoration: none;
    opacity: 0.7;
    display: inline-block;
    transition:
        opacity 400ms var(--ease-organic),
        letter-spacing 400ms var(--ease-organic),
        color 400ms var(--ease-organic);
}

.contact-link:hover,
.contact-link:focus {
    opacity: 1;
    color: #ffffff;
    letter-spacing: 0.35em;
}

/* Legacy nav-link support for other pages */
.nav-link {
    font-size: 0.85rem;
    font-weight: 300;
    letter-spacing: 0.25em;
    text-transform: uppercase;
    color: var(--color-text);
    opacity: 0.7;
    text-decoration: none;
    cursor: pointer;
    transition:
        opacity var(--transition-medium) var(--ease-organic),
        letter-spacing var(--transition-medium) var(--ease-organic);
    display: inline-block;
}

.nav-link:hover,
.nav-link:focus {
    opacity: 1;
}

/* Divider between nav items */
.nav-divider {
    width: 1px;
    height: 14px;
    background: var(--color-text);
    opacity: 0.2;
}

/* ===========================================
   PROJECTS DROPDOWN MENU
   =========================================== */
.dropdown {
    position: relative;
}

.projects-dropdown,
.dropdown-menu {
    position: absolute;
    top: calc(100% + 15px);
    right: 0;
    background: rgba(10, 10, 15, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(224, 225, 221, 0.1);
    border-radius: 2px;
    padding: 1.5rem;
    min-width: 220px;

    /* Hidden by default */
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition:
        opacity 600ms var(--ease-organic),
        transform 600ms var(--ease-organic),
        visibility 600ms;
}

.dropdown.active .projects-dropdown,
.dropdown.active .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

/* Dropdown list */
.dropdown-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

.dropdown-item {
    opacity: 0;
    transform: translateY(-10px) translateX(-5px);
}

.dropdown.active .dropdown-item {
    animation: dropdownItemEnter 400ms var(--ease-organic) forwards;
}

/* Staggered entrance for dropdown items */
.dropdown.active .dropdown-item:nth-child(1) { animation-delay: 0ms; }
.dropdown.active .dropdown-item:nth-child(2) { animation-delay: 80ms; }
.dropdown.active .dropdown-item:nth-child(3) { animation-delay: 160ms; }
.dropdown.active .dropdown-item:nth-child(4) { animation-delay: 240ms; }
.dropdown.active .dropdown-item:nth-child(5) { animation-delay: 320ms; }
.dropdown.active .dropdown-item:nth-child(6) { animation-delay: 400ms; }

@keyframes dropdownItemEnter {
    from {
        opacity: 0;
        transform: translateY(-10px) translateX(-5px);
    }
    to {
        opacity: 0.6;
        transform: translateY(0) translateX(0);
    }
}

.dropdown-link {
    font-size: 0.8rem;
    font-weight: 300;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-text);
    text-decoration: none;
    display: block;
    padding: 0.6rem 0;
    opacity: 0.6;
    transform: translateX(0);
    transition:
        opacity 300ms var(--ease-settle),
        color 300ms var(--ease-settle),
        transform 300ms var(--ease-settle);
}

.dropdown-link:hover,
.dropdown-link:focus {
    opacity: 1;
    color: #ffffff;
    transform: translateX(8px);
}

/* Contact link breathing effect - legacy */
.nav-link.contact-link:hover {
    letter-spacing: 0.35em;
}

/* ===========================================
   HOMEPAGE SPECIFIC
   =========================================== */
#canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
}

/* ===========================================
   CONTENT OVERLAY (Hero + About container)
   =========================================== */
.content-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    min-height: 100dvh; /* Dynamic viewport height for mobile */
    z-index: 1;
    pointer-events: none;

    /* Flexbox to center hero */
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

/* Enable pointer events for interactive children */
.content-overlay a,
.content-overlay button,
.content-overlay .about-section {
    pointer-events: auto;
}

/* ===========================================
   HERO SECTION (Centered)
   =========================================== */
.hero {
    text-align: center;
    opacity: 0;
    transform: translateY(20px);
    animation: heroEnter 1.5s var(--ease-gentle) 0.5s forwards;
}

@keyframes heroEnter {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-title {
    font-size: clamp(2.5rem, 8vw, 4rem);
    font-weight: 200;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--color-text);
    margin-bottom: 0.5rem;
    opacity: 0.9;
}

.hero-subtitle {
    font-family: var(--font-main);
    font-size: 0.9rem;
    font-weight: 400;               /* Thicker than title for hierarchy */
    letter-spacing: 0.25em;
    text-transform: uppercase;
    color: #ffffff;                 /* Pure white for maximum contrast */
    opacity: 0.95;
    text-shadow:
        0 2px 10px rgba(0, 0, 0, 0.8),
        0 4px 20px rgba(0, 0, 0, 0.6); /* Multi-layer shadow to cut through particles */
    margin-top: 1.5rem;
    position: relative;
    z-index: 10;

    /* Subtle text background for extreme readability */
    padding: 0.5rem 1rem;
    background: linear-gradient(
        90deg,
        rgba(0, 0, 0, 0) 0%,
        rgba(0, 0, 0, 0.4) 20%,
        rgba(0, 0, 0, 0.4) 80%,
        rgba(0, 0, 0, 0) 100%
    );
    display: inline-block;
}

/* ===========================================
   ABOUT SECTION (Bottom-left, positioned absolutely)
   =========================================== */
.about-section {
    position: absolute;
    bottom: 80px;
    left: var(--content-padding);
    max-width: 400px;
    text-align: left;

    /* Entrance animation */
    opacity: 0;
    transform: translateY(20px);
    animation: aboutEnter 1.5s var(--ease-gentle) 1s forwards;
}

@keyframes aboutEnter {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.about-section-title {
    font-size: 1.2rem;
    font-weight: 200;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    margin-bottom: 1.5rem;
    color: var(--color-text);
    opacity: 0.9;
}

.about-section-text {
    font-size: 1.2rem;
    font-weight: 300;
    letter-spacing: 0.1em;
    line-height: 1.6;
    color: var(--color-text);
    opacity: 0.7;
}

/* Legacy about styles for other pages */
.about {
    position: fixed;
    bottom: 80px;
    left: var(--content-padding);
    max-width: 400px;
    z-index: 1;
    pointer-events: none;

    /* Entrance animation */
    opacity: 0;
    transform: translateY(20px);
    animation: aboutEnter 1.5s var(--ease-gentle) 1s forwards;
}

.about-title {
    font-size: 1.2rem;
    font-weight: 200;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    margin-bottom: 1.5rem;
    color: var(--color-text);
    opacity: 0.9;
}

.about-text {
    font-size: 1.2rem;
    font-weight: 300;
    letter-spacing: 0.1em;
    line-height: 1.6;
    color: var(--color-text);
    opacity: 0.7;
}

/* ===========================================
   PROJECT PAGES
   =========================================== */
.project-page {
    min-height: 100vh;
    transition: background-color var(--transition-slow) var(--ease-gentle);
}

.project-page.project-1 { background-color: var(--color-project-1); }
.project-page.project-2 { background-color: var(--color-project-2); }
.project-page.project-3 { background-color: var(--color-project-3); }
.project-page.project-4 { background-color: var(--color-project-4); }
.project-page.project-5 { background-color: var(--color-project-5); }
.project-page.project-6 { background-color: var(--color-project-6); }

.project-content {
    margin-top: 15vh;
    padding: 0 var(--content-padding);
}

.project-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 60vh;
}

.project-placeholder span {
    font-size: 0.9rem;
    font-weight: 200;
    letter-spacing: 0.4em;
    text-transform: uppercase;
    color: var(--color-text);
    opacity: 0.3;
}

/* ===========================================
   CONTACT PAGE
   =========================================== */
.contact-page {
    min-height: 100vh;
    background-color: var(--color-contact);
    display: flex;
    align-items: center;
    justify-content: center;
}

.contact-content {
    max-width: 600px;
    text-align: center;
    padding: 0 var(--content-padding);
}

.contact-intro {
    font-size: 1rem;
    font-weight: 300;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--color-text);
    opacity: 0.6;
    margin-bottom: 3rem;

    /* Staggered entrance */
    opacity: 0;
    transform: translateY(20px);
    animation: contactLineEnter 800ms var(--ease-organic) 200ms forwards;
}

.contact-email {
    font-size: 1.5rem;
    font-weight: 300;
    letter-spacing: 0.1em;
    color: var(--color-text);
    text-decoration: none;
    display: inline-block;
    transition:
        letter-spacing 600ms var(--ease-organic),
        color 600ms var(--ease-organic);

    /* Staggered entrance */
    opacity: 0;
    transform: translateY(20px);
    animation: contactLineEnter 800ms var(--ease-organic) 350ms forwards;
}

.contact-email:hover {
    letter-spacing: 0.2em;
    color: var(--color-accent);
}

.contact-social {
    margin-top: 4rem;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0;

    /* Staggered entrance */
    opacity: 0;
    transform: translateY(20px);
    animation: contactLineEnter 800ms var(--ease-organic) 500ms forwards;
}

.contact-social-link {
    font-size: 0.85rem;
    font-weight: 300;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-text);
    text-decoration: none;
    opacity: 0.6;
    transition:
        opacity var(--transition-medium) var(--ease-organic),
        color var(--transition-medium) var(--ease-organic);
    padding: 0 1rem;
}

.contact-social-link:hover {
    opacity: 1;
    color: var(--color-accent);
}

.contact-social-divider {
    color: var(--color-text);
    opacity: 0.3;
}

@keyframes contactLineEnter {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===========================================
   ACCESSIBILITY - REDUCED MOTION
   =========================================== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    .about,
    .contact-intro,
    .contact-email,
    .contact-social {
        opacity: 1;
        transform: none;
        animation: none;
    }

    .dropdown-item {
        opacity: 0.6;
        transform: none;
        animation: none;
    }

    .dropdown.active .dropdown-item {
        animation: none;
        opacity: 0.6;
    }
}

/* ===========================================
   MOBILE RESPONSIVE (<768px)
   =========================================== */
@media (max-width: 768px) {
    :root {
        --nav-padding: 24px;
        --content-padding: 30px;
    }

    /* Navigation moves to center-top */
    .main-nav,
    .nav {
        top: var(--nav-padding);
        right: 50%;
        transform: translateX(50%);
    }

    .nav-home {
        top: auto;
        bottom: var(--nav-padding);
        left: 50%;
        transform: translateX(-50%);
    }

    /* Dropdown becomes full-width overlay */
    .projects-dropdown,
    .dropdown-menu {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        width: 100%;
        height: auto;
        min-height: 50vh;
        background: rgba(0, 0, 0, 0.95);
        border: none;
        border-radius: 0;
        padding: 100px var(--content-padding) 60px;
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .dropdown-list {
        gap: 1.2rem;
        text-align: center;
    }

    .dropdown-link {
        font-size: 1rem;
    }

    /* Hero section */
    .hero-title {
        font-size: clamp(2rem, 10vw, 3rem);
        letter-spacing: 0.2em;
    }

    .hero-subtitle {
        font-size: 0.85rem;
        letter-spacing: 0.1em;
    }

    /* About section (new) */
    .about-section {
        bottom: 100px;
        left: 50%;
        transform: translateX(-50%);
        width: calc(100% - 60px);
        max-width: none;
        text-align: center;
    }

    .about-section-title {
        font-size: 1rem;
    }

    .about-section-text {
        font-size: 1rem;
    }

    /* About section (legacy) */
    .about {
        bottom: 100px;
        left: 50%;
        transform: translateX(-50%);
        width: calc(100% - 60px);
        max-width: none;
        text-align: center;
    }

    @keyframes aboutEnter {
        to {
            opacity: 1;
            transform: translateX(-50%) translateY(0);
        }
    }

    .about-title {
        font-size: 1rem;
    }

    .about-text {
        font-size: 1rem;
    }

    /* Project pages */
    .project-content {
        padding: 0 var(--content-padding);
    }

    /* Contact page */
    .contact-content {
        padding: 0 var(--content-padding);
    }

    .contact-email {
        font-size: 1.2rem;
    }

    .contact-social {
        flex-wrap: wrap;
        gap: 0.5rem;
    }

    /* ========================================
       MOBILE READABILITY ENHANCEMENTS
       Add backgrounds/shadows for text over murmuration
       ======================================== */

    /* "What I Do" heading - dark gradient background for readability */
    .about-section-title {
        text-shadow:
            0 2px 10px rgba(0,0,0,0.9),
            0 4px 20px rgba(0,0,0,0.8);
        background: linear-gradient(
            90deg,
            rgba(0,0,0,0) 0%,
            rgba(0,0,0,0.5) 20%,
            rgba(0,0,0,0.5) 80%,
            rgba(0,0,0,0) 100%
        );
        padding: 0.5rem 1rem;
        display: inline-block;
        border-radius: 2px;
    }

    /* About text paragraph - subtle background for readability */
    .about-section-text {
        text-shadow: 0 2px 10px rgba(0,0,0,0.9);
        background: rgba(0,0,0,0.4);
        padding: 1rem;
        border-radius: 2px;
        backdrop-filter: blur(2px);
    }

    /* Navigation buttons - dark backgrounds for readability */
    .projects-trigger,
    .contact-link {
        text-shadow: 0 2px 8px rgba(0,0,0,0.9);
        background: rgba(0,0,0,0.5) !important;
        backdrop-filter: blur(4px);
        padding: 10px 14px !important;
        border-radius: 2px;
        border: 1px solid rgba(224,225,221,0.2) !important;
    }

    /* Projects dropdown - opaque background on mobile */
    .projects-dropdown,
    .dropdown-menu {
        background: rgba(10, 10, 15, 0.95);
    }
}

/* ===========================================
   FOCUS STATES (ACCESSIBILITY)
   =========================================== */
.nav-link:focus,
.projects-trigger:focus,
.contact-link:focus,
.dropdown-link:focus,
.nav-home-link:focus,
.contact-email:focus,
.contact-social-link:focus {
    outline: 1px solid var(--color-text);
    outline-offset: 4px;
}

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