/* =========================================
   GLOBAL VARIABLES
========================================= */
:root {
    --pink: #f7a8b8;
    --blue: #a8d8f7;

    --text-light: #222;
    --card-light: rgba(255, 255, 255, 0.85);

    --text-dark: #f1f1f1;
}

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

/* =========================================
   BASE + SAFARI FIX
========================================= */
html, body {
    min-height: 100%;
    background-color: #ffffff;
}

body {
    font-family: Arial, Helvetica, sans-serif;
    line-height: 1.6;

    color: var(--text-light);

    background: linear-gradient(135deg, var(--pink), var(--blue));
    min-height: 100vh;

    transition: background 0.3s, color 0.3s;

    /* iOS safe area fix */
    padding:
        env(safe-area-inset-top)
        env(safe-area-inset-right)
        env(safe-area-inset-bottom)
        env(safe-area-inset-left);
}

/* =========================================
   DARK MODE
========================================= */
body.dark-mode {
    color: var(--text-dark);

    background-color: #000;

    background-image:
        linear-gradient(rgba(0,0,0,0.65), rgba(0,0,0,0.65)),
        linear-gradient(135deg, var(--pink), var(--blue));

    background-attachment: fixed;
}

/* =========================================
   HEADER
========================================= */
header {
    text-align: center;
    padding: 2rem 1rem;
    position: relative;
}

header h1 {
    font-size: 2.5rem;
}

header p {
    font-size: 1.2rem;
}

/* =========================================
   TOGGLE BUTTON
========================================= */
.toggle-btn {
    position: absolute;
    top: 1rem;
    right: 1rem;

    border: none;
    border-radius: 10px;
    padding: 0.5rem 0.7rem;

    cursor: pointer;
    background: var(--card-light);

    font-size: 1.2rem;

    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.toggle-btn span {
    display: inline-block;
    transition: transform 0.4s ease;
}

.toggle-btn:active span {
    transform: rotate(180deg) scale(1.2);
}

body.dark-mode .toggle-btn {
    background: rgba(30, 30, 30, 0.85);
    color: var(--text-dark);
}

@media (hover: hover) and (pointer: fine) {
    .toggle-btn:hover {
        transform: translateY(-2px);
        box-shadow: 0 5px 12px rgba(0,0,0,0.25);
    }
}

/* =========================================
   NAVIGATION
========================================= */
nav {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin: 1rem 0;
    flex-wrap: wrap;
}

nav a {
    text-decoration: none;
    color: inherit;
    background: var(--card-light);
    padding: 0.6rem 1rem;
    border-radius: 8px;
    font-weight: bold;

    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

body.dark-mode nav a {
    background: rgba(30, 30, 30, 0.85);
    color: var(--text-dark);
}

@media (hover: hover) and (pointer: fine) {
    nav a:hover {
        transform: translateY(-3px);
        box-shadow: 0 6px 15px rgba(0,0,0,0.2);
    }
}

/* =========================================
   MAIN CONTENT
========================================= */
main {
    max-width: 900px;
    margin: auto;
    padding: 1rem;
}

/* =========================================
   CARDS
========================================= */
.card {
    background: var(--card-light);
    padding: 1.5rem;
    margin: 1rem 0;
    border-radius: 12px;

    backdrop-filter: blur(5px);
}

body.dark-mode .card {
    background: rgba(20, 20, 20, 0.85);
}

.card h2 {
    margin-bottom: 0.75rem;
}

/* =========================================
   FOOTER
========================================= */
footer {
    text-align: center;
    padding: 1rem;
    font-size: 0.9rem;
}

/* =========================================
   MOBILE
========================================= */
@media (max-width: 600px) {
    header h1 {
        font-size: 2rem;
    }

    nav {
        flex-direction: column;
        align-items: center;
    }

    nav a {
        width: 80%;
        text-align: center;
    }
}