/* Global variables */

:root {
    --clr-bg:hsl(47, 43%, 96%);
    --clr-bg-hover: hsl(33, 37%, 91%);
    --clr-bg-dark: hsl(0, 0%, 18%);
    --clr-card-dark: hsl(0, 0%, 13%);
    --clr-card-light: hsl(0, 0%, 10%);
    --clr-text: hsl(0, 0%, 24%);
    --clr-text-light: hsl(0, 0%, 96%);
    --clr-accent: hsl(31, 42%, 59%);
    --clr-accent-light: rgba(217, 180, 135, 0.3);
    --clr-accent-hover: hsl(28, 37%, 53%);
    --clr-border: hsl(33, 34%, 74%);
    --clr-shadow: rgba(0, 0, 0, 0.1);
    --clr-error: hsl(2, 70%, 55%);
    --clr-success: rgb(0, 128, 0);
    --clr-error-bg: hsl(6, 80%, 95%);
    --clr-card-dark: hsl(0, 0%, 18%);   
    --clr-oath-bg: rgba(250, 245, 240, 0.07);  
    --font-main: "Quicksand", sans-serif;
    --font-header: "Georgia", serif;
    --border-radius: 20px;
}

/* Basic styles */

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

body, html {
    width: 100%;
    overflow-x: hidden;
    overflow-y: auto;
    font-family: var(--font-main);
    background-color: var(--clr-bg);
    color: var(--clr-text);
    transition: background-color 0.3s ease, color 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

img {
    width: 120px;
    height: 120px;
    max-width: 100%;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--clr-border);
}

.profile-img {
    width: 130px;
    height: 130px;
    border-radius: 50%; 
    object-fit: cover;
    box-shadow: 0 4px 10px var(--clr-shadow);
    flex-shrink: 0;
    display: inline-block;
}

#contact {
    margin: 1rem;
}

#loader {
    position: relative;
}

/* Typography styles */

h1, h2 {
    text-shadow: 1px 1px 2px var(--clr-shadow);
}

h1 {
    font-size: 2rem;
}

/* Header styles */

header {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 2rem;
    max-width: 1200px;
    gap: 1.5rem;
    margin: 0 auto;
    position: relative;
} 

header h1 {
    font-size: 3.5rem;
    color: var(--clr-text);
}

header h2 {
    font-size: 2rem;
    color: var(--clr-accent);
}

header p {
    font-size: 1.1rem;
    line-height: 1.6;
    color: var(--clr-text);
}

/* Footer styles */

footer {
    text-align: center;
    font-size: 1rem;
    margin: 1rem;
    padding: 1rem; 
}

footer a {
    color: var(--clr-accent);
    text-decoration: none;
    font-weight: bold;
    transition: color 0.3s ease-in-out;
    cursor: pointer;
}

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

.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;
}

/* Card styles */

#projects {    
    display: grid;
    gap: 2rem;
    margin: 2rem;
}

.card {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
    padding: 1.5rem;    
    background: var(--clr-bg);
    box-shadow: 0 4px 20px var(--clr-shadow);
    border-radius: var(--border-radius);  
    transition: transform 0.3s ease, background-color 0.3s ease;   
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    overflow: hidden;
}

.card:hover {
    transform: scale(1.02);
    box-shadow: 0 8px 16px var(--clr-shadow); 
}

.card img {
    max-width: 200px;
    height: auto;
    border-radius: var(--border-radius);
    object-fit: cover;
}

.card-content {
  flex: 1;
}

.card h3 {
    margin-bottom: 0.5rem;
    font-size: 1.4rem;
}

.card p {
    margin-bottom: 0.75rem;
    font-size: 1rem;
}

.card a {
    display: inline-block;
    background-color: var(--clr-border);
    color: var(--clr-bg);
    padding: 0.5rem 1rem;
    text-decoration: none;    
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: background-color 0.3s;
}

.card a:hover {
    background-color: var(--clr-accent-hover);
}

.overlay-esg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    padding: 1rem;
    background: rgba(0, 0, 0, 0.5);
    color: var(--clr-text-light);
    font-size: 0.9rem;
    font-weight: 500;
    text-align: center;
    opacity: 0;
    transition: opacity 0.4s ease;
    pointer-events: none;
    font-style: italic;
    border-bottom-left-radius: var(--border-radius);
    border-bottom-right-radius: var(--border-radius);
    backdrop-filter: blur(3px);
}

.card:hover .overlay-esg {
    opacity: 1;
}

/* Dark mode styles */

.dark-mode {
    background-color: var(--clr-bg-dark);
    color: var(--clr-text-light);
}

.dark-mode .card {  
    background-color: var(--clr-card-dark);
    color: var(--clr-text-light);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.6);
    border: 1px solid var(--clr-border);
}

.dark-mode footer a,
.dark-mode input {
    color: var(--clr-text-light);
}

.dark-mode input {
    background: var(--clr-card-dark);
    border: 1px solid var(--clr-border);
}

.dark-mode button {
    background-color: var(--clr-accent);
    color: var(--clr-bg);
}

.dark-mode button:hover {
    background-color: var(--clr-accent-hover);
}

.dark-mode header h1,
.dark-mode header h2,
.dark-mode header p {
  color: var(--clr-text-light);
}

/* Form styles */

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

input {
    background: var(--clr-bg);
    border: 1px solid var(--clr-border);
    color: var(--clr-text);
    padding: 0.75rem;
    border-radius: var(--border-radius);
}

input.error {
    border-color: var(--clr-error);
    background-color: var(--clr-error-bg);
}

.error-message {
    color: var(--clr-error);
    font-size: 0.8rem;
    margin-top: 4px;
    display: block;
}

.form-message {
    margin-top: 0.5rem;
    font-size: 0.9rem;
    transition: opacity 0.3s ease-in-out;
    opacity: 0;
}

.form-message.success {
    color: var(--clr-success);
    opacity: 1;
}

.form-message.error {
    color: var(--clr-error);
    opacity: 1;
}

/* Button styles */

button {
    background-color: var(--clr-accent);
    color: var(--clr-bg);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    cursor: pointer;
    transition: transform 0.2s ease;
}

button:hover {
    transform: scale(1.05);
    background-color: var(--clr-accent-hover);
}

button:active {
    transform: scale(0.97);
}

#enterBtn {
    position: absolute;
    bottom: 10%;
    left: 70%;
    padding: 0.75rem 1.5rem;
    border-radius: 1rem;
    z-index: 10;
    transition: background-color 0.3s ease, transform 0.3s ease;
    font-size: 1rem;
    background-color: var(--clr-accent-light);
    border: 1px solid var(--clr-border);
    opacity: 0;
    pointer-events: none;
    animation: fadeIn 1.5s ease forwards;
    animation-delay: 2.5s;
    color: var(--clr-bg);
    cursor: pointer;
    max-width: 80%;
    backdrop-filter: blur(4px);
}

#enterBtn:hover {
    background-color: var(--clr-accent-hover);
    opacity: 1;
    transform: scale(1.05);
}

#toggle-dark {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    z-index: 20;
    background-color: var(--clr-accent);
    color: var(--clr-bg);
    padding: 0.5rem 1.2rem;
    border-radius: 999px;
    font-size: 0.9rem;
    box-shadow: 0 4px 8px var(--clr-shadow);
    backdrop-filter: blur(6px);
    transition: all 0.3s ease-in-out;
    border: none;
    cursor: pointer;
}

#toggle-dark:hover {
    background-color: var(--clr-accent-hover);
    transform: scale(1.05);
}

/* Animation styles */

.intro {
    display: flex;
    position: relative;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 2rem;
    background-color: var(--clr-bg-dark);
    text-align: center;
    flex-direction: column;    
    color: var(--clr-bg);
    overflow: hidden;
}

#stars-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    z-index: 0;
    pointer-events: none;
}

.star {
    position: absolute;
    background: var(--clr-bg);
    border-radius: 50%;
    opacity: 0.8;
    animation: twinkle 2s infinite ease-in-out;
    width: 2px;
    height: 2px;
    z-index: 0;
}

@keyframes twinkle {
    0%, 100% { opacity: 0.3; transform: scale(1); }
    50% { opacity: 1; transform: scale(1.2); }
}

@keyframes fadeIn {
    to {
        opacity: 1;
        pointer-events: auto;
    }
}

.fade-in-up {
    opacity: 0;
    animation: fadeInUp 2s ease-out forwards;
    animation-delay: 0.5s;
}

.fade-in-main {
    animation: mainFadeIn 1s ease;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
  }
}

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

/* Oath styles */

.oath-container {
    max-width: 800px;
    background: var(--clr-oath-bg);
    padding: 2rem;
    border-radius: 2rem;
    box-shadow: 0 0 20px var(--clr-shadow);
    font-family: var(--font-header);   
    font-size: 1.2rem;
    position: relative;
    z-index: 1;
    backdrop-filter: blur(6px);
    margin: auto;
}

blockquote {
    font-style: italic;
    color: var(--clr-accent);
    margin-bottom: 1rem;
}

/* Responsive styles */

@media (max-width: 800px) {
    header {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    footer {
        flex-direction: column;
        gap: 0.5rem;
        text-align: center;
        margin: 0 auto;
    }

    .oath-container {
        padding: 1rem;
        font-size: 1rem;
    }
  
    header h1 {
        font-size: 2.5rem;
    }

    header h2 {
        font-size: 1.5rem;
    }

    .card {
        flex-direction: column;
        text-align: left;  
    }

    .card img {
        height: auto;
        max-width: 100%;
    }

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

    #enterBtn {
        bottom: 10%;
        left: 70%;
        padding: 0.5rem 1rem;
        font-size: 0.9rem;
    }
}

@media (min-width: 801px) {
    #contact form {
        flex-direction: row;
        align-items: center;
        justify-content: center;
        gap: 1rem;
    }

    #contact label {
        margin: 0;
        font-weight: bold;
    }

    #user_email {
        flex: 1;
        min-width: 250px;
    }

    #contact button {
        flex-shrink: 0;
        padding: 0.6rem 1.2rem;
    }

    #form-message {
        width: 100%;
        text-align: center;
        margin-top: 0.5rem;
    }

    #contact h2 {
        margin-bottom: 1rem;
    }
}

button:focus-visible, input:focus-visible {
    outline: 3px solid var(--clr-accent);
}

a:focus-visible {
    outline: 2px solid var(--clr-accent);
}