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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 72px;
    color-scheme: dark;
}

body {
    font-family: 'Roboto', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--surface-0);
    color: var(--on-surface);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

/* Code font for decorative elements */
.mono { font-family: 'JetBrains Mono', 'Courier New', monospace; }

/* Container */
.container { max-width: 1280px; margin: 0 auto; padding: 0 1rem; }
@media (min-width: 640px)  { .container { padding: 0 1.5rem; } }
@media (min-width: 1024px) { .container { padding: 0 2rem;   } }

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4, h5, h6 { font-weight: 700; line-height: 1.2; }

.gradient-text {
    background: linear-gradient(135deg, var(--android-green) 0%, var(--tertiary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ===== MATERIAL RIPPLE ===== */
.ripple-host { position: relative; overflow: hidden; }
.ripple {
    position: absolute;
    border-radius: 50%;
    background: rgba(61,220,132,0.25);
    transform: scale(0);
    animation: ripple-anim 600ms linear;
    pointer-events: none;
}
@keyframes ripple-anim {
    to { transform: scale(4); opacity: 0; }
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.625rem 1.5rem;
    border-radius: var(--radius-full);
    font-family: 'Roboto', sans-serif;
    font-weight: 500;
    font-size: 0.875rem;
    letter-spacing: 0.01em;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: var(--android-green);
    color: var(--on-primary);
    box-shadow: var(--shadow-1);
}
.btn-primary:hover {
    background: #4FE896;
    box-shadow: var(--glow-green), var(--shadow-2);
    transform: translateY(-1px);
}

.btn-tonal {
    background: var(--android-green-dim);
    color: var(--android-green);
    border: 1px solid rgba(61,220,132,0.25);
}
.btn-tonal:hover {
    background: rgba(61,220,132,0.2);
    box-shadow: var(--glow-green);
}

.btn-outline {
    background: transparent;
    color: var(--android-green);
    border: 1px solid var(--android-green);
}
.btn-outline:hover {
    background: var(--android-green-dim);
    box-shadow: var(--glow-green);
}

.btn-lg { padding: 0.875rem 2rem; font-size: 1rem; }
.btn-full { width: 100%; justify-content: center; }

.btn svg { width: 1.125rem; height: 1.125rem; transition: transform var(--transition-fast); }
.btn:hover svg { transform: translateX(3px); }

/* ===== MATERIAL CARDS ===== */
.card {
    background: var(--surface-2);
    border: 1px solid var(--outline-variant);
    border-radius: var(--radius-xl);
    transition: all var(--transition-base);
    box-shadow: var(--shadow-1);
}
.card:hover {
    border-color: rgba(61,220,132,0.35);
    box-shadow: var(--shadow-2), 0 0 0 1px rgba(61,220,132,0.15);
    transform: translateY(-2px);
}
.card-content { padding: 1.5rem; }
.card-header {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--outline-variant);
}
.card-header-title { font-size: 1rem; font-weight: 600; text-align: center; color: var(--on-surface); }

/* ===== MATERIAL CHIPS ===== */
.chip {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.3rem 0.875rem;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 500;
    border: 1px solid var(--outline-variant);
    background: var(--surface-3);
    color: var(--on-surface-variant);
    transition: all var(--transition-fast);
    cursor: default;
    letter-spacing: 0.02em;
}
.chip:hover {
    border-color: var(--android-green);
    color: var(--android-green);
    background: var(--android-green-dim);
}
.chip-green  { border-color: rgba(61,220,132,0.4); color: var(--android-green); background: var(--android-green-dim); }
.chip-violet { border-color: rgba(187,134,252,0.4); color: var(--secondary); background: var(--secondary-dim); }
.chip-blue   { border-color: rgba(100,181,246,0.4); color: var(--tertiary); background: var(--tertiary-dim); }

/* ===== SECTION BASE ===== */
section { padding: 5rem 0; }

.section-header { text-align: center; margin-bottom: 4rem; }

.section-label {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.3rem 1rem;
    background: var(--android-green-dim);
    border: 1px solid rgba(61,220,132,0.3);
    border-radius: var(--radius-full);
    color: var(--android-green);
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    margin-bottom: 1rem;
    font-family: 'JetBrains Mono', monospace;
}

.section-title {
    font-size: 2.25rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--on-surface);
}
@media (min-width: 640px) { .section-title { font-size: 3rem; } }

.section-divider {
    width: 4rem;
    height: 3px;
    background: linear-gradient(90deg, var(--android-green), var(--tertiary));
    margin: 0 auto 1rem;
    border-radius: var(--radius-full);
}

.section-description {
    color: var(--on-surface-dim);
    max-width: 42rem;
    margin: 0 auto;
    line-height: 1.75;
}

/* ===== SECTION CODE BACKGROUND (Matrix style) ===== */
.section-code-bg {
    position: absolute;
    inset: 0;
    pointer-events: none;
    overflow: hidden;
    z-index: 0;
}
.section-code-scroll {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.65rem;
    line-height: 1.65;
    white-space: pre;
    padding: 1rem 2rem;
    width: 100%;
    animation: codeScroll var(--code-speed, 35s) linear infinite;
    user-select: none;
}
/* Per-section tint variations */
.about     .section-code-scroll { color: var(--secondary);     opacity: 0.04; --code-speed: 40s; }
.skills    .section-code-scroll { color: var(--android-green); opacity: 0.035; --code-speed: 28s; }
.experience .section-code-scroll { color: var(--tertiary);     opacity: 0.04; --code-speed: 45s; animation-direction: reverse; }
.projects  .section-code-scroll { color: var(--android-green); opacity: 0.03; --code-speed: 32s; }
.contact   .section-code-scroll { color: var(--secondary);     opacity: 0.035; --code-speed: 38s; animation-direction: reverse; }

/* Make sure section children sit above the bg */
.about > .container,
.skills > .container,
.experience > .container,
.projects > .container,
.contact > .container { position: relative; z-index: 1; }

/* ===== ANIMATIONS ===== */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(2rem); }
    to   { opacity: 1; transform: translateY(0);    }
}
@keyframes fadeIn {
    from { opacity: 0; }
    to   { opacity: 1; }
}
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50%       { opacity: 0.4; }
}
@keyframes float {
    0%, 100% { transform: translateY(0px);    }
    50%       { transform: translateY(-10px); }
}
@keyframes blink {
    0%, 100% { opacity: 1; }
    50%       { opacity: 0; }
}
@keyframes codeScroll {
    from { transform: translateY(0); }
    to   { transform: translateY(-50%); }
}
@keyframes scanLine {
    0%   { top: -4px; }
    100% { top: 100%; }
}

.hidden { display: none !important; }