/* =========================================================
   Happy Birthday, Shaheed Sir
   A premium digital birthday card
   ---------------------------------------------------------
   1.  Variables
   2.  Reset
   3.  Base styles
   4.  Typography
   5.  Landing page
   6.  Decorative elements
   7.  Hero animations
   8.  Buttons / CTA
   9.  Party popper
   10. Page transition
   11. Wishes page
   12. Video container
   13. Closing / footer
   14. Responsive styles
   15. Reduced motion
   ========================================================= */


/* =========================================================
   1. VARIABLES
   ========================================================= */
:root {
    /* Palette */
    --cream:        #FCF1D0;
    --royal-navy:   #22396F;
    --deep-navy:    #0D1C42;
    --dark-navy:    #010736;

    /* Derived tints (kept strictly within the palette) */
    --cream-soft:   rgba(252, 241, 208, 0.78);
    --cream-muted:  rgba(252, 241, 208, 0.62);
    --cream-faint:  rgba(252, 241, 208, 0.14);
    --navy-soft:    rgba(34, 57, 111, 0.72);
    --navy-muted:   rgba(34, 57, 111, 0.52);
    --navy-faint:   rgba(34, 57, 111, 0.14);

    /* Fonts */
    --font-sans:    "Poppins", "Segoe UI", system-ui, -apple-system, sans-serif;
    --font-script:  "Great Vibes", "Snell Roundhand", "Apple Chancery", cursive;

    /* Type scale */
    --fs-eyebrow:   clamp(0.68rem, 1.6vw, 0.82rem);
    --fs-title:     clamp(2.45rem, 8.4vw, 6rem);
    --fs-title-sm:  clamp(1.85rem, 5.6vw, 3.6rem);
    --fs-body:      clamp(0.98rem, 2.1vw, 1.22rem);
    --fs-small:     clamp(0.84rem, 1.7vw, 0.98rem);

    /* Rhythm */
    --gutter:       clamp(1.25rem, 5vw, 4rem);
    --radius:       18px;
    --radius-pill:  999px;

    /* Motion */
    --ease-out:     cubic-bezier(0.22, 0.72, 0.28, 1);
    --ease-curtain: cubic-bezier(0.76, 0, 0.24, 1);
    --curtain-dur:  640ms;
}


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

html {
    -webkit-text-size-adjust: 100%;
    scroll-behavior: smooth;
}

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

iframe {
    border: 0;
}

a {
    color: inherit;
    text-decoration: none;
}

::selection {
    background: var(--royal-navy);
    color: var(--cream);
}


/* =========================================================
   3. BASE STYLES
   ========================================================= */
body {
    min-height: 100svh;
    font-family: var(--font-sans);
    font-weight: 400;
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.page--landing {
    background-color: var(--cream);
    color: var(--deep-navy);
}

.page--wishes {
    background-color: var(--dark-navy);
    color: var(--cream);
}

/* Keyboard focus — always visible, never on mouse click */
:focus-visible {
    outline: 2px solid currentColor;
    outline-offset: 4px;
    border-radius: 4px;
}

.page--landing :focus-visible { outline-color: var(--royal-navy); }
.page--wishes  :focus-visible { outline-color: var(--cream); }


/* =========================================================
   4. TYPOGRAPHY
   ========================================================= */
h1 {
    font-weight: 700;
    line-height: 1.04;
    letter-spacing: -0.022em;
    text-wrap: balance;
}

.hero__eyebrow {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: clamp(0.6rem, 2vw, 1rem);
    font-size: var(--fs-eyebrow);
    font-weight: 500;
    letter-spacing: 0.34em;
    text-transform: uppercase;
    color: var(--navy-muted);
}

.page--wishes .hero__eyebrow {
    color: var(--cream-muted);
}

.hero__eyebrow-rule {
    display: block;
    width: clamp(28px, 7vw, 58px);
    height: 1px;
    background: currentColor;
    opacity: 0.55;
}


/* =========================================================
   5. LANDING PAGE
   ========================================================= */
.hero {
    position: relative;
    z-index: 2;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100svh;
    padding: clamp(3.5rem, 10vh, 6rem) var(--gutter);
}

.hero__inner {
    width: 100%;
    max-width: 820px;
    text-align: center;
}

.hero__title {
    margin-top: clamp(1.1rem, 3vh, 1.9rem);
    font-size: var(--fs-title);
    color: var(--deep-navy);
}

.hero__title-line {
    display: block;
}

/* "Happy Birthday," — flowing script.
   Script faces read optically smaller than a geometric sans at the same
   size, so it is scaled up; the tight tracking inherited from h1 is reset
   because negative tracking collides the joined letterforms. */
.hero__title-line--script {
    font-family: var(--font-script);
    font-weight: 400;
    font-size: 1.34em;
    line-height: 1.12;
    letter-spacing: 0.005em;
    color: var(--deep-navy);
    padding-bottom: 0.06em;   /* breathing room for the descenders */
}

/* "Shaheed Sir!" — the anchor, in Poppins */
.hero__title-line--name {
    margin-top: 0.06em;
    color: var(--royal-navy);
}

.hero__message {
    max-width: 34ch;
    margin: clamp(1.3rem, 4vh, 2.1rem) auto 0;
    font-size: var(--fs-body);
    font-weight: 400;
    line-height: 1.72;
    color: var(--navy-soft);
    text-wrap: pretty;
}

.hero__signature {
    margin-top: clamp(0.9rem, 2.4vh, 1.3rem);
    font-size: var(--fs-small);
    font-weight: 500;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--navy-muted);
}

.hero .btn {
    margin-top: clamp(2rem, 5.5vh, 3.1rem);
}


/* =========================================================
   6. DECORATIVE ELEMENTS
   ========================================================= */
.decor {
    position: fixed;
    inset: 0;
    z-index: 0;
    overflow: hidden;
    pointer-events: none;
    contain: layout paint style;
}

/* --- Thin geometric rings --- */
.decor__ring {
    position: absolute;
    border: 1px solid var(--navy-faint);
    border-radius: 50%;
    opacity: 0;
    animation: decor-in 1100ms var(--ease-out) 120ms forwards;
}

.decor--dark .decor__ring {
    border-color: var(--cream-faint);
}

.decor__ring--one {
    width: min(56vw, 620px);
    aspect-ratio: 1;
    top: -18vh;
    right: -14vw;
}

.decor__ring--two {
    width: min(44vw, 480px);
    aspect-ratio: 1;
    bottom: -16vh;
    left: -12vw;
}

/* --- Hairline verticals --- */
.decor__line {
    position: absolute;
    top: 0;
    width: 1px;
    height: 100%;
    opacity: 0;
    background: linear-gradient(
        to bottom,
        transparent,
        var(--navy-faint) 28%,
        var(--navy-faint) 72%,
        transparent
    );
    animation: decor-in 1200ms var(--ease-out) 220ms forwards;
}

.decor--dark .decor__line {
    background: linear-gradient(
        to bottom,
        transparent,
        var(--cream-faint) 28%,
        var(--cream-faint) 72%,
        transparent
    );
}

.decor__line--left  { left: clamp(1.5rem, 8vw, 8rem); }
.decor__line--right { right: clamp(1.5rem, 8vw, 8rem); }

/* --- Four point sparkles --- */
.spark {
    position: absolute;
    width: 14px;
    height: 14px;
    background: var(--royal-navy);
    opacity: 0;
    clip-path: polygon(
        50% 0%, 61% 39%, 100% 50%, 61% 61%,
        50% 100%, 39% 61%, 0% 50%, 39% 39%
    );
    animation:
        decor-in 900ms var(--ease-out) forwards,
        twinkle 5.5s var(--ease-out) infinite;
}

.decor--dark .spark {
    background: var(--cream);
}

.spark--a { top: 16%;  left: 13%;  width: 16px; height: 16px; animation-delay: 320ms, 900ms;  }
.spark--b { top: 26%;  right: 17%; width: 11px; height: 11px; animation-delay: 420ms, 1700ms; }
.spark--c { bottom: 22%; left: 20%; width: 12px; height: 12px; animation-delay: 520ms, 2500ms; }
.spark--d { bottom: 17%; right: 14%; width: 17px; height: 17px; animation-delay: 620ms, 1300ms; }
.spark--e { top: 46%;  left: 6%;   width: 9px;  height: 9px;  animation-delay: 720ms, 3100ms; }
.spark--f { top: 58%;  right: 7%;  width: 10px; height: 10px; animation-delay: 820ms, 2100ms; }

/* --- Soft glowing dots --- */
.dot {
    position: absolute;
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: var(--royal-navy);
    opacity: 0;
    box-shadow: 0 0 0 6px var(--navy-faint);
    animation:
        decor-in 900ms var(--ease-out) forwards,
        drift 9s ease-in-out infinite;
}

.decor--dark .dot {
    background: var(--cream);
    box-shadow: 0 0 0 6px var(--cream-faint);
}

.dot--a { top: 34%; left: 26%; animation-delay: 560ms, 1000ms; }
.dot--b { top: 70%; right: 24%; animation-delay: 660ms, 2400ms; }
.dot--c { top: 12%; left: 52%; animation-delay: 760ms, 3600ms; }

@keyframes decor-in {
    from { opacity: 0; transform: scale(0.82); }
    to   { opacity: 1; transform: scale(1); }
}

@keyframes twinkle {
    0%, 100%  { opacity: 0.95; transform: scale(1) rotate(0deg); }
    50%       { opacity: 0.35; transform: scale(0.72) rotate(35deg); }
}

@keyframes drift {
    0%, 100% { transform: translate3d(0, 0, 0); opacity: 0.85; }
    50%      { transform: translate3d(0, -14px, 0); opacity: 0.4; }
}


/* =========================================================
   7. HERO ANIMATIONS (staged reveal)
   ========================================================= */
/* `backwards` fill holds the hidden state during the delay, then releases the
   element back to its natural style — so hover transforms are never locked
   behind a finished animation and no layer stays promoted. */
.reveal {
    animation: reveal-up 850ms var(--ease-out) backwards;
}

.reveal[data-reveal="1"] { animation-delay: 380ms; }
.reveal[data-reveal="2"] { animation-delay: 500ms; }
.reveal[data-reveal="3"] { animation-delay: 660ms; }
.reveal[data-reveal="4"] { animation-delay: 790ms; }
.reveal[data-reveal="5"] { animation-delay: 920ms; }
.reveal[data-reveal="6"] { animation-delay: 1050ms; }

@keyframes reveal-up {
    from { opacity: 0; transform: translate3d(0, 22px, 0); }
}


/* =========================================================
   8. BUTTONS / CTA
   ========================================================= */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.7em;
    min-height: 56px;
    padding: 1rem 2.1rem;
    border-radius: var(--radius-pill);
    font-family: inherit;
    font-size: clamp(0.95rem, 1.9vw, 1.05rem);
    font-weight: 600;
    letter-spacing: 0.015em;
    cursor: pointer;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
    transition:
        transform 320ms var(--ease-out),
        box-shadow 320ms var(--ease-out),
        background-color 320ms var(--ease-out),
        border-color 320ms var(--ease-out),
        color 320ms var(--ease-out);
}

/* --- Primary (cream page) --- */
.btn--primary {
    background-color: var(--royal-navy);
    color: var(--cream);
    border: 1px solid var(--royal-navy);
    box-shadow: 0 10px 26px -12px rgba(1, 7, 54, 0.55);
}

.btn--primary:hover {
    background-color: var(--deep-navy);
    border-color: var(--deep-navy);
    box-shadow: 0 18px 38px -14px rgba(1, 7, 54, 0.62);
    transform: translate3d(0, -3px, 0) scale(1.025);
}

.btn--primary:active {
    transform: translate3d(0, -1px, 0) scale(0.99);
}

/* --- Ghost (dark page, back link) --- */
.btn--ghost {
    min-height: 46px;
    padding: 0.6rem 1.35rem;
    background-color: transparent;
    color: var(--cream-soft);
    border: 1px solid var(--cream-faint);
    font-size: var(--fs-small);
    font-weight: 500;
}

.btn--ghost:hover {
    color: var(--cream);
    background-color: var(--deep-navy);
    border-color: var(--royal-navy);
    transform: translate3d(0, -2px, 0);
}

.btn__label {
    white-space: nowrap;
}

/* --- Animated arrow: one glyph slides out, a ghost follows in --- */
.btn__arrow {
    position: relative;
    display: inline-block;
    width: 1.35em;
    height: 1em;
    overflow: hidden;
    line-height: 1;
}

.btn__arrow-glyph {
    position: absolute;
    top: 0;
    left: 0;
    display: block;
    width: 100%;
    transition: transform 340ms var(--ease-out);
}

.btn__arrow-glyph--ghost {
    transform: translate3d(-120%, 0, 0);
}

.btn:hover .btn__arrow-glyph        { transform: translate3d(120%, 0, 0); }
.btn:hover .btn__arrow-glyph--ghost { transform: translate3d(0, 0, 0); }

/* Back arrow points the other way */
.btn__arrow--back .btn__arrow-glyph--ghost { transform: translate3d(120%, 0, 0); }
.btn:hover .btn__arrow--back .btn__arrow-glyph        { transform: translate3d(-120%, 0, 0); }
.btn:hover .btn__arrow--back .btn__arrow-glyph--ghost { transform: translate3d(0, 0, 0); }


/* =========================================================
   9. PARTY POPPER (Lottie one-shot)
   ========================================================= */
.popper {
    position: fixed;
    inset: 0;
    z-index: 80;              /* above the hero, below the curtain */
    pointer-events: none;     /* must never intercept the CTA */
    opacity: 1;
    contain: layout paint style;
    transition: opacity 700ms var(--ease-out);
}

/* Faded out once the burst has played, then removed from the DOM. */
.popper.is-spent {
    opacity: 0;
}

.popper svg {
    display: block;
    width: 100%;
    height: 100%;
}


/* =========================================================
   10. PAGE TRANSITION (cinematic curtain)
   ========================================================= */
.curtain {
    position: fixed;
    inset: 0;
    z-index: 90;
    pointer-events: none;
}

.curtain__panel {
    position: absolute;
    inset: 0;
    background-color: var(--dark-navy);
    transform: translate3d(0, -100%, 0);
    will-change: transform;
}

/* A small cream diamond that breathes at the centre of the sweep */
.curtain__seal {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 16px;
    height: 16px;
    margin: -8px 0 0 -8px;
    border: 1px solid var(--cream);
    opacity: 0;
    transform: rotate(45deg) scale(0.4);
}

/* Entering: the curtain lifts away, revealing the page */
.page:not(.is-leaving) .curtain__panel {
    animation: curtain-lift var(--curtain-dur) var(--ease-curtain) both;
}

.page:not(.is-leaving) .curtain__seal {
    animation: seal-out 420ms var(--ease-out) both;
}

/* Leaving: the curtain sweeps in and covers the page */
.page.is-leaving .curtain__panel {
    animation: curtain-drop var(--curtain-dur) var(--ease-curtain) both;
}

.page.is-leaving .curtain__seal {
    animation: seal-in 520ms var(--ease-out) 140ms both;
}

/* The page itself softly recedes underneath the curtain */
.page.is-leaving .hero,
.page.is-leaving .wishes,
.page.is-leaving .topbar {
    transition: opacity 400ms var(--ease-out), transform 520ms var(--ease-out);
    opacity: 0;
    transform: translate3d(0, -14px, 0);
}

.page.is-leaving .decor {
    transition: opacity 360ms var(--ease-out);
    opacity: 0;
}

@keyframes curtain-lift {
    from { transform: translate3d(0, 0, 0); }
    to   { transform: translate3d(0, -100%, 0); }
}

@keyframes curtain-drop {
    from { transform: translate3d(0, 100%, 0); }
    to   { transform: translate3d(0, 0, 0); }
}

@keyframes seal-in {
    0%   { opacity: 0; transform: rotate(0deg) scale(0.35); }
    60%  { opacity: 1; transform: rotate(45deg) scale(1); }
    100% { opacity: 0.85; transform: rotate(45deg) scale(1.15); }
}

@keyframes seal-out {
    0%   { opacity: 0.85; transform: rotate(45deg) scale(1.1); }
    100% { opacity: 0; transform: rotate(90deg) scale(0.4); }
}


/* =========================================================
   11. WISHES PAGE
   ========================================================= */
.topbar {
    position: relative;
    z-index: 3;
    padding: clamp(1.25rem, 3.5vw, 2.25rem) var(--gutter) 0;
}

.wishes {
    position: relative;
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: clamp(2.25rem, 7vh, 4.5rem) var(--gutter) clamp(3rem, 8vh, 5rem);
}

.wishes__head {
    width: 100%;
    max-width: 780px;
    text-align: center;
}

.wishes__title {
    margin-top: clamp(1rem, 2.6vh, 1.6rem);
    font-size: var(--fs-title-sm);
    font-weight: 600;
    color: var(--cream);
}

.wishes__subtitle {
    max-width: 44ch;
    margin: clamp(0.9rem, 2.4vh, 1.4rem) auto 0;
    font-size: var(--fs-body);
    line-height: 1.7;
    color: var(--cream-soft);
    text-wrap: balance;
}

.br-lg { display: none; }


/* =========================================================
   12. VIDEO CONTAINER
   ========================================================= */
.video {
    width: 100%;
    max-width: 1060px;
    margin-top: clamp(2.25rem, 6vh, 3.75rem);
}

.video__frame {
    position: relative;
    width: 95%;
    max-width: 1060px;
    margin-inline: auto;
    padding: clamp(6px, 1.1vw, 12px);
    background-color: var(--deep-navy);
    border: 1px solid var(--royal-navy);
    border-radius: calc(var(--radius) + 8px);
    box-shadow:
        0 30px 70px -32px rgba(1, 7, 54, 0.95),
        0 0 0 1px rgba(252, 241, 208, 0.04);
}

.video__ratio {
    position: relative;
    aspect-ratio: 16 / 9;
    width: 100%;
    overflow: hidden;
    border-radius: var(--radius);
    background-color: var(--dark-navy);
}

.video__iframe,
.video__ratio iframe {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    display: block;
}

/* Fallback shown when no video ID has been set yet */
.video__placeholder {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 1.5rem;
    text-align: center;
    color: var(--cream-muted);
    font-size: var(--fs-small);
}

.video__placeholder code {
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
    font-size: 0.9em;
    color: var(--cream);
    background-color: var(--royal-navy);
    padding: 0.15em 0.5em;
    border-radius: 6px;
}


/* =========================================================
   13. CLOSING / FOOTER
   ========================================================= */
.closing {
    margin-top: clamp(2.5rem, 7vh, 4rem);
    text-align: center;
}

.closing__rule {
    display: block;
    width: 52px;
    height: 1px;
    margin: 0 auto clamp(1.25rem, 3vh, 1.85rem);
    background-color: var(--royal-navy);
}

.closing__line {
    font-size: var(--fs-body);
    font-weight: 500;
    color: var(--cream);
}

.closing__heart {
    color: var(--cream);
    opacity: 0.9;
}

.closing__sub {
    margin-top: 0.55rem;
    font-size: var(--fs-small);
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--cream-muted);
}


/* =========================================================
   14. RESPONSIVE STYLES
   ========================================================= */

/* --- Large screens: let the headline breathe --- */
@media (min-width: 1024px) {
    .br-lg { display: block; }

    .hero__inner { max-width: 900px; }
}

/* --- Tablet --- */
@media (max-width: 768px) {
    .decor__line--left  { left: 1.1rem; }
    .decor__line--right { right: 1.1rem; }

    .video__frame { width: 100%; }
}

/* --- Mobile: fewer, smaller decorations --- */
@media (max-width: 600px) {
    :root { --radius: 14px; }

    .decor__line,
    .spark--e,
    .spark--f,
    .dot--c {
        display: none;
    }

    .spark { width: 11px; height: 11px; }
    .spark--a { width: 13px; height: 13px; }
    .spark--d { width: 13px; height: 13px; }

    .decor__ring--one { width: 78vw; top: -12vh; right: -26vw; }
    .decor__ring--two { width: 66vw; bottom: -10vh; left: -24vw; }

    .hero__eyebrow { letter-spacing: 0.26em; }

    .hero__title-line--script { font-size: 1.24em; }

    .hero__message { max-width: 30ch; }

    .btn--primary {
        width: 100%;
        max-width: 340px;
        padding: 1rem 1.5rem;
    }

    .video__frame { padding: 5px; }
}

/* --- Very small phones (320px) --- */
@media (max-width: 360px) {
    .dot--b { display: none; }

    .hero__eyebrow { letter-spacing: 0.2em; }

    .btn--ghost { padding: 0.55rem 1rem; }
}

/* --- Short landscape screens --- */
@media (max-height: 520px) and (orientation: landscape) {
    .hero { min-height: auto; padding-block: 3rem; }

    .hero .btn { margin-top: 1.5rem; }

    .decor__ring { display: none; }
}

/* --- Devices without hover (no arrow animation on tap) --- */
@media (hover: none) {
    .btn:hover {
        transform: none;
    }

    .btn:hover .btn__arrow-glyph        { transform: translate3d(0, 0, 0); }
    .btn:hover .btn__arrow-glyph--ghost { transform: translate3d(-120%, 0, 0); }
}


/* =========================================================
   15. REDUCED MOTION
   ========================================================= */
@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    .reveal {
        opacity: 1;
        transform: none;
        animation: none !important;
    }

    .decor__ring,
    .decor__line,
    .spark,
    .dot {
        opacity: 1;
        transform: none;
        animation: none !important;
    }

    .curtain,
    .popper {
        display: none;
    }

    .btn:hover {
        transform: none;
    }
}